How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Mon, 23 Aug 2010 18:51:43 +0100, Clive wrote:
In message , Jules Richardson writes Or you get a "Friday engine", assembled by someone who is itching to get away for the weekend and so not paying as much attention to their work as they should :-( This was the problem with British cars. Every car was a Friday afternoon car. Nah! The cars were cool! Blame it on Lucas, the Prince of Darkness. |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Mon, 23 Aug 2010 21:54:15 +0000, Hachiroku ハチ*ク wrote:
On Mon, 23 Aug 2010 18:51:43 +0100, Clive wrote: In message , Jules Richardson writes Or you get a "Friday engine", assembled by someone who is itching to get away for the weekend and so not paying as much attention to their work as they should :-( This was the problem with British cars. Every car was a Friday afternoon car. Nah! The cars were cool! Blame it on Lucas, the Prince of Darkness. I've owned a few 70's British cars over the years and to be honest never had much problem with Lucas - no worse than electrics in other cars. Moisture seems to be the main killer, not quality issues with the parts themselves. cheers Jules |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On 2010-08-24, Jules Richardson wrote:
I've owned a few 70's British cars over the years and to be honest never had much problem with Lucas - no worse than electrics in other cars. Moisture seems to be the main killer, not quality issues with the parts themselves. I agree. I've owned a few Limey cars and lotsa Brit bikes. I know the older bikes blew bulbs cuz of the bizarre fluctuations of their weird zenier diode based electrical system, but no more than the sealed head lamps of my body-numbing vibrator HD Sportster. I never had a prob with Lucas lights/electrics on any of the cars I had. I think that whole myth is jes something perpetuated by dolts with no experience with Lucas and who just like saying the phrase. "Du-uh... Lucas, prince of darkness. heh heh...." [drool] nb |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Tue, 24 Aug 2010 15:39:51 +0000 (UTC), Jules Richardson
wrote: On Mon, 23 Aug 2010 21:54:15 +0000, Hachiroku ???? wrote: On Mon, 23 Aug 2010 18:51:43 +0100, Clive wrote: In message , Jules Richardson writes Or you get a "Friday engine", assembled by someone who is itching to get away for the weekend and so not paying as much attention to their work as they should :-( This was the problem with British cars. Every car was a Friday afternoon car. Nah! The cars were cool! Blame it on Lucas, the Prince of Darkness. I've owned a few 70's British cars over the years and to be honest never had much problem with Lucas - no worse than electrics in other cars. Moisture seems to be the main killer, not quality issues with the parts themselves. You must be the only one. A friend basically had to redesign the entire electrical system himself. The Lucas didn't like the Tucson heat at all. He had to hike home more than once. |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
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How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On 2010-08-25, Scott Dorsey wrote:
Whoever the hell it was that decided running 25A into the dashboard switch to avoid using a headlight relay... that was an MG employee, not a Lucas one. That explains a lot. I only had Austin Healeys and Triumphs. Never had any problems with Lucas on either of them. Don't recall ever changing a light bulb, front or back. Some of the tail light lens designs sucked donkey dick. Those stupid out-there tail light lenses on the Spitefire were always getting whacked by cars, bicycles, baby strollers, stray cats, gentle summer breezes.... ;) nb |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Wed, 25 Aug 2010 13:27:30 GMT, notbob wrote:
That explains a lot. As an update, I stopped by a small engine shop and the mechanic, an old school buddy whom I trust, said they make a special tool to adjust the Low and High carbeurator 'pins'. He didn't have it for the Craftsman (he worked only on Husqvarna) but he said they exist for each brand. Does anyone know where to get the California adjustment tool for the Poulan? I called Poulan customer support 866-802-6383 but all they said was that it's illegal for an owner to adjust his carbeurator in California. So, do you know where I can get those adjustment tools for the Poulan carb screws? |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Wed, 25 Aug 2010 09:03:13 -0700, SF Man wrote:
Does anyone know where to get the California adjustment tool for the Poulan? I called chain saw customer support 866-802-6383 but all they said was that it's illegal for an owner to adjust his carbeurator in California. I called another number, 1.800.554.6723 and Poulan customer support said it's illegal for them to sell a California carbeurator adjustment tool (P/N 530035560) to the public, but, (here's the catch), I can go to any authorized dealer and they CAN sell the California carbeurator adjustment tool to me. Laws are weird. Poulan customer service gave me a list of dealers but once I realized I can get the Poulan carburetor adjustment tool, I simply googled for "Poulan 530035560 Splined Carburetor Adjustment Tool" and will buy it off the web if I can't get it locally at the Poulan authorized dealers. |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Wed, 25 Aug 2010 09:18:02 -0700, SF Man wrote:
I simply googled for "Poulan 530035560 Splined Carburetor Adjustment Tool" I'm curious. Is a "spline" what those California carburator adjustment "pins" are? |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Thu, 19 Aug 2010 12:57:45 -0700, SF Man wrote:
Do you know where to find the tune-up procedure for the Sears Craftsman 358.351.800 18 inch chain saw? I found a good video for tuning the Poulan Craftsman chain saw carburator: http://www.youtube.com/watch?v=3Lw0pJcEPYo I ordered the splined carburator adjustment tool so that I can adjust the non-adjustable California 'pins' for the Low and High settings. http://www.hyperparts.com/wc.dll?ctw...1003~530035560 It's important to note that we need 92 psi in order for a 2-stroke engine to run according to the dealer I spoke with today so I'll also check the compression (I need to change the fitting on my compression tester which was for 70's model car spark plugs with a different thread than this chain saw). Anything else you suggest? |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Wed, 25 Aug 2010 09:44:37 -0700, SF Man
wrote: On Thu, 19 Aug 2010 12:57:45 -0700, SF Man wrote: Do you know where to find the tune-up procedure for the Sears Craftsman 358.351.800 18 inch chain saw? I found a good video for tuning the Poulan Craftsman chain saw carburator: http://www.youtube.com/watch?v=3Lw0pJcEPYo I ordered the splined carburator adjustment tool so that I can adjust the non-adjustable California 'pins' for the Low and High settings. http://www.hyperparts.com/wc.dll?ctw...1003~530035560 It's important to note that we need 92 psi in order for a 2-stroke engine to run according to the dealer I spoke with today so I'll also check the compression (I need to change the fitting on my compression tester which was for 70's model car spark plugs with a different thread than this chain saw). Anything else you suggest? Follow the steps in the video -- that was good. He tuned it by ear. I do this with all my small engines. He suggested removing the muffler to check for scoring on the rings and piston. Unless you have piston, rings, cylinder damage -- chances are your compression is _good_. This is not an old unit. Cross the state line into Nevada and adjust the carb, so you don't break the law G. |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Aug 25, 11:27*am, Oren wrote:
On Wed, 25 Aug 2010 09:44:37 -0700, SF Man wrote: On Thu, 19 Aug 2010 12:57:45 -0700, SF Man wrote: Do you know where to find the tune-up procedure for the Sears Craftsman 358.351.800 18 inch chain saw? I found a good video for tuning the Poulan Craftsman chain saw carburator: http://www.youtube.com/watch?v=3Lw0pJcEPYo I ordered the splined carburator adjustment tool so that I can adjust the non-adjustable California 'pins' for the Low and High settings. http://www.hyperparts.com/wc.dll?ctw...1003~530035560 It's important to note that we need 92 psi in order for a 2-stroke engine to run according to the dealer I spoke with today so I'll also check the compression (I need to change the fitting on my compression tester which was for 70's model car spark plugs with a different thread than this chain saw). Anything else you suggest? Follow the steps in the video -- that was good. He tuned it by ear. I do this with all my small engines. He suggested removing the muffler to check for scoring on the rings and piston. *Unless you have piston, rings, cylinder damage -- chances are your compression is _good_. *This is not an old unit. Cross the state line into Nevada and adjust the carb, so you don't break the law G. == Following this thread is like following an action-packed soap opera. Will SF Man ever get his chainsaw to work?...stay tuned for the next episode. Just kidding...keep at it. == |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Aug 25, 9:25*am, SF Man wrote:
On Wed, 25 Aug 2010 09:18:02 -0700, SF Man wrote: I simply googled for "Poulan 530035560 Splined Carburetor Adjustment Tool" I'm curious. Is a "spline" what those California carburator adjustment "pins" are? I'm wondering if this isn't a small Torx tool. With them calling it a spline. |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Wed, 25 Aug 2010 10:27:46 -0700, Oren wrote:
Cross the state line into Nevada and adjust the carb, so you don't break the law G. I'm close to the Pacific ocean. I wonder how far I have to go out to be governed my international law. :) I can't wait for my "splined" tool to arrive. The "pins" on the L and H carburator screws seem to be smooth but we'll see when the tool arrives. It was a good suggestion to remove the muffler to check the rings; and the 92 PSI is a good idea to test compression also (although the Craftsman chainsaw is only 1 year old with only a few hours on it). I'm beginning to hate Craftsman / Poulan ... by the way ... but I'll save the rant for another day. |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Aug 25, 3:00*pm, Bob Villa wrote:
On Aug 25, 9:25*am, SF Man wrote: On Wed, 25 Aug 2010 09:18:02 -0700, SF Man wrote: I simply googled for "Poulan 530035560 Splined Carburetor Adjustment Tool" I'm curious. Is a "spline" what those California carburator adjustment "pins" are? I'm wondering if *this isn't a small Torx tool. *With them calling it a spline. No, it is not torx. They make a couple different sizes of these splined tools. They are like a nut driver, but splined. I have one. It is an absolute necessity when adjusting carbs. Hank |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Aug 26, 4:56*am, Hank wrote:
On Aug 25, 3:00*pm, Bob Villa wrote: On Aug 25, 9:25*am, SF Man wrote: On Wed, 25 Aug 2010 09:18:02 -0700, SF Man wrote: I simply googled for "Poulan 530035560 Splined Carburetor Adjustment Tool" I'm curious. Is a "spline" what those California carburator adjustment "pins" are? I'm wondering if *this isn't a small Torx tool. *With them calling it a spline. No, it is not torx. They make a couple different sizes of these splined tools. They are like a nut driver, but splined. I have one. It is an absolute necessity when adjusting carbs. Hank How many teeth to the spline...could you use a torx deck screw and make one? ;) |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
I'm also following. Good luck, SF man.
-- Christopher A. Young Learn more about Jesus www.lds.org .. "Roy" wrote in message ... == Following this thread is like following an action-packed soap opera. Will SF Man ever get his chainsaw to work?...stay tuned for the next episode. Just kidding...keep at it. == |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Wed, 25 Aug 2010 20:12:14 -0700, SF Man wrote:
On Wed, 25 Aug 2010 10:27:46 -0700, Oren wrote: Cross the state line into Nevada and adjust the carb, so you don't break the law G. I'm close to the Pacific ocean. I wonder how far I have to go out to be governed my international law. :) I can't wait for my "splined" tool to arrive. The "pins" on the L and H carburator screws seem to be smooth but we'll see when the tool arrives. It was a good suggestion to remove the muffler to check the rings; and the 92 PSI is a good idea to test compression also (although the Craftsman chainsaw is only 1 year old with only a few hours on it). Let us know what you eventually find out... cheers Jules |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Wed, 25 Aug 2010 20:12:14 -0700, SF Man
wrote: I can't wait for my "splined" tool to arrive. The "pins" on the L and H carburator screws seem to be smooth but we'll see when the tool arrives. I'm betting you could use a dremel tool and cut a slot in the heads of the screws. Then use a standard screwdriver. No? |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Aug 26, 7:31*am, Bob Villa wrote:
On Aug 26, 4:56*am, Hank wrote: On Aug 25, 3:00*pm, Bob Villa wrote: On Aug 25, 9:25*am, SF Man wrote: On Wed, 25 Aug 2010 09:18:02 -0700, SF Man wrote: I simply googled for "Poulan 530035560 Splined Carburetor Adjustment Tool" I'm curious. Is a "spline" what those California carburator adjustment "pins" are? I'm wondering if *this isn't a small Torx tool. *With them calling it a spline. No, it is not torx. They make a couple different sizes of these splined tools. They are like a nut driver, but splined. I have one. It is an absolute necessity when adjusting carbs. Hank How many teeth to the spline...could you use a torx deck screw and make one? ;)- Hide quoted text - - Show quoted text - I never tried, but I doubt it because teh splines are so fine and small. Hank |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Aug 26, 12:41*pm, Oren wrote:
On Wed, 25 Aug 2010 20:12:14 -0700, SF Man wrote: I can't wait for my "splined" tool to arrive. The "pins" on the L and H carburator screws seem to be smooth but we'll see when the tool arrives. I'm betting you could use a dremel tool and cut a slot in the heads of the screws. Then use a standard screwdriver. No? The screws are recessed in a metal surrounding. It would be very difficult to do. I did talk to a couple guys who said they used those crimp-on wire connectors and slid them over. I tried that method but couldn't get it to work. Maybe I was doing something wrong. Anyway, my tool has paid for itself... $5. Also on a side note to all that is following.........when dis- assembling something as complicated as a carb, or even something you have never taken apart, take pics of it BEFORE and DURING dis- assembly. By doing this, you won't be confused as to where that spring goes, where the linkage goes and etc. when you want to re-assemble it. Hank |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Thu, 26 Aug 2010 12:42:18 -0700 (PDT), Hank wrote:
splines are so fine and small. I have to agree. The tool is inexpensive (shipping costs more than the tool). It hasn't arrived yet so I can't tell you more. On the pins, the "splines", if they're there at all, must be so tiny I can't see them. You can't actually touch the screw because it's recessed and they put a plastic housing around it expressly so you could not get pliars around it. They really look like pins more than screws. The only thing you can get on them is some socket-like thing (which I'm hoping the spline tool is). Does anyone have a PICTURE of the splines close up so we can see what we're dealing with? |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Sun, 29 Aug 2010 11:21:41 -0700, SF Man
wrote: Still waiting for the tool to arrive. Me too! Hang in, you're almost there. |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
CORDED: The reason a chain saw can't use a power cord is that it would need to be hundreds upon hundreds of feet long and would be impossible to drag through the chaparral without catching on scores of bushes, rocks, and trees. CY: Even with a portable generator, still not really convenient. BATTERY: The reason a chain saw can't use a battery is that it would die after felling only a few trees and cutting up the limbs. We'd spend more time waiting for it to charge than cutting. CY: Need the new Nuclear Power Batteries. They are sold out of North Korea, on Ebay. Don't want the Iranian Nuclear Power Batteries, they sometimes explode. FOUR STROKE: The reason most chain saws aren't four strokes, as far as I can tell, is that four strokes without oil pumps can't be placed in all the positions that a chain saw needs to be without spilling oil into the cylinder. CY: And they are heavier. The used to be made, for felling trees. When one knows the saw operation is always going to be in the same position. They were operated by two men. TWO STROKE: The reason most chain saws are two strokes, I presume, is that is less expensive than a oil-pump driven four stroke and the two stroke works in any position. CY: Also, the two stroke fires on every piston stroke, so the HP to weight ratio is much higher. BTW, if there are good four-stroke chain saws on the market, let me know which you prefer. CY: I havn't looked, but they are likely out of the home owner price range. |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Sun, 29 Aug 2010 11:25:42 -0700, SF Man wrote:
On Fri, 27 Aug 2010 12:04:56 -0700 (PDT), zzyzzx wrote: get a new chainsaw that uses electricity instead. You're joking right? Gas turbine is the way to go... ;-) |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Thu, 19 Aug 2010 12:57:45 -0700, SF Man wrote:
The Sears Craftsman 358351 chain saw is now about a year old, and I've got only about 3 or 4 hours on it (a few tanks of gas and bar oil) but it now won't even start anymore except when left overnight. Even then, it only runs until I lift my finger off the trigger and it conks out and won't start again. Thanks for all the help you guys. This is my followup message. I never could get it started. I brought it to an engin-repair shop and they just called to tell me it's unrepairable. The compression was 50psi but apparently two-stroke engines need 90psi to start. He said he removed the muffler and he could see the scored piston. I have NO IDEA why the Craftsman/Poulan piston scored after only a year of occasional use, as I have been the only use of the chainsaw and I never abused it. Sears has a 2-year warranty but I'd have to find my receipt and they might say I neglected it (even though I can't imagine how I did that). Next time someone can't start a two-stroke, one of the first things I'll ask him to do is check the compression and remove the muffler to see if the pistons are scored. :( PS: Any idea what to do with the now-useless chain saw? |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Mon, 20 Sep 2010 13:47:34 -0700, SF Man
wrote: On Thu, 19 Aug 2010 12:57:45 -0700, SF Man wrote: The Sears Craftsman 358351 chain saw is now about a year old, and I've got only about 3 or 4 hours on it (a few tanks of gas and bar oil) but it now won't even start anymore except when left overnight. Even then, it only runs until I lift my finger off the trigger and it conks out and won't start again. Thanks for all the help you guys. This is my followup message. Thanks for the follow up. I never could get it started. I brought it to an engin-repair shop and they just called to tell me it's unrepairable. The video you found on youtube showed how to do this check. Did the shop charge you for this? The compression was 50psi but apparently two-stroke engines need 90psi to start. He said he removed the muffler and he could see the scored piston. I have NO IDEA why the Craftsman/Poulan piston scored after only a year of occasional use, as I have been the only use of the chainsaw and I never abused it. Lack of "enough" oil in the gas mixture? Always better for a little more oil and foul a plug than not enough oil. Sears has a 2-year warranty but I'd have to find my receipt and they might say I neglected it (even though I can't imagine how I did that). If you bought it with a credit card, some cards give an additional warranty. I have a drawer in the garage for receipts and manuals. It's my go to place when looking for "papers" Next time someone can't start a two-stroke, one of the first things I'll ask him to do is check the compression and remove the muffler to see if the pistons are scored. :( PS: Any idea what to do with the now-useless chain saw? Boat anchor? Or part it out and sell the parts! |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Sep 20, 4:47*pm, SF Man wrote:
Thanks for all the help you guys. This is my followup message. I never could get it started. I brought it to an engin-repair shop and they just called to tell me it's unrepairable. The compression was 50psi but apparently two-stroke engines need 90psi to start. He said he removed the muffler and he could see the scored piston. I have NO IDEA why the Craftsman/Poulan piston scored after only a year of occasional use, as I have been the only use of the chainsaw and I never abused it. Sears has a 2-year warranty but I'd have to find my receipt and they might say I neglected it (even though I can't imagine how I did that). Next time someone can't start a two-stroke, one of the first things I'll ask him to do is check the compression and remove the muffler to see if the pistons are scored. :( PS: Any idea what to do with the now-useless chain saw? I had a guy bring me his 14hp Kawasaki mower that didn't run. He took it to the biggest small engine repair shop in Columbus Ohio. They told him his cylinder was scored and had low compression. They disassembled it and it was in pieces. Cost him $200. I looked and the cylinders were in great shape. I lapped in the valves and gaped them. Started first pull. I suggest you get another opinion since you only used it occasionally. Many shops take in stuff and never even attempt to fix it, only to charge you a "diagnostic charge". I hope they didn't charge you. Hank |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
I'd like you to ship it to me, so I can play with it. But, I'm
guessing the postage would be a bit much. Post Office won't ship anything that once held gasoline. Have to be UPS. -- Christopher A. Young Learn more about Jesus www.lds.org .. "SF Man" wrote in message ... On Thu, 19 Aug 2010 12:57:45 -0700, SF Man wrote: The Sears Craftsman 358351 chain saw is now about a year old, and I've got only about 3 or 4 hours on it (a few tanks of gas and bar oil) but it now won't even start anymore except when left overnight. Even then, it only runs until I lift my finger off the trigger and it conks out and won't start again. Thanks for all the help you guys. This is my followup message. I never could get it started. I brought it to an engin-repair shop and they just called to tell me it's unrepairable. The compression was 50psi but apparently two-stroke engines need 90psi to start. He said he removed the muffler and he could see the scored piston. I have NO IDEA why the Craftsman/Poulan piston scored after only a year of occasional use, as I have been the only use of the chainsaw and I never abused it. Sears has a 2-year warranty but I'd have to find my receipt and they might say I neglected it (even though I can't imagine how I did that). Next time someone can't start a two-stroke, one of the first things I'll ask him to do is check the compression and remove the muffler to see if the pistons are scored. :( PS: Any idea what to do with the now-useless chain saw? |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
"SF Man" wrote in message news:i5e8na$2d7 FOUR STROKE: The reason most chain saws aren't four strokes, as far as I can tell, is that four strokes without oil pumps can't be placed in all the positions that a chain saw needs to be without spilling oil into the cylinder. TWO STROKE: The reason most chain saws are two strokes, I presume, is that is less expensive than a oil-pump driven four stroke and the two stroke works in any position. Where weight counts, as in a chainsaw, the two stroke cycle gives you power on every stroke where the 4 stroke cycle is only on every other stroke. That is really why. But to make a "run in any position" four stroke would increase the complexity. |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
In article ,
"hls" wrote: "SF Man" wrote in message news:i5e8na$2d7 FOUR STROKE: The reason most chain saws aren't four strokes, as far as I can tell, is that four strokes without oil pumps can't be placed in all the positions that a chain saw needs to be without spilling oil into the cylinder. TWO STROKE: The reason most chain saws are two strokes, I presume, is that is less expensive than a oil-pump driven four stroke and the two stroke works in any position. Where weight counts, as in a chainsaw, the two stroke cycle gives you power on every stroke where the 4 stroke cycle is only on every other stroke. That is really why. But to make a "run in any position" four stroke would increase the complexity. Here's what I remember from building the "Visible V-8" model when I was a kid: intake, compression, combustion (power), exhaust. I count power on every fourth stroke. |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
Smitty Two wrote:
In article , "hls" wrote: "SF Man" wrote in message news:i5e8na$2d7 FOUR STROKE: The reason most chain saws aren't four strokes, as far as I can tell, is that four strokes without oil pumps can't be placed in all the positions that a chain saw needs to be without spilling oil into the cylinder. TWO STROKE: The reason most chain saws are two strokes, I presume, is that is less expensive than a oil-pump driven four stroke and the two stroke works in any position. Where weight counts, as in a chainsaw, the two stroke cycle gives you power on every stroke where the 4 stroke cycle is only on every other stroke. That is really why. But to make a "run in any position" four stroke would increase the complexity. Here's what I remember from building the "Visible V-8" model when I was a kid: intake, compression, combustion (power), exhaust. I count power on every fourth stroke. Compression and exhaust are with the piston going up. A four-mode cycle gives power from a given cylinder on every other crank rotation. http://www.animatedengines.com/otto.shtml -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
In article ,
AMuzi wrote: Smitty Two wrote: In article , "hls" wrote: "SF Man" wrote in message news:i5e8na$2d7 FOUR STROKE: The reason most chain saws aren't four strokes, as far as I can tell, is that four strokes without oil pumps can't be placed in all the positions that a chain saw needs to be without spilling oil into the cylinder. TWO STROKE: The reason most chain saws are two strokes, I presume, is that is less expensive than a oil-pump driven four stroke and the two stroke works in any position. Where weight counts, as in a chainsaw, the two stroke cycle gives you power on every stroke where the 4 stroke cycle is only on every other stroke. That is really why. But to make a "run in any position" four stroke would increase the complexity. Here's what I remember from building the "Visible V-8" model when I was a kid: intake, compression, combustion (power), exhaust. I count power on every fourth stroke. Compression and exhaust are with the piston going up. A four-mode cycle gives power from a given cylinder on every other crank rotation. http://www.animatedengines.com/otto.shtml I think it's a misnomer to call a crank rotation a "stroke." The four strokes of a four-stroke ICE are as noted, so you get power on every fourth stroke. I can't tell from your post whether you agree with that. |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Mon, 18 Oct 2010 09:12:57 -0700, Smitty Two
wrote: Here's what I remember from building the "Visible V-8" model when I was a kid: intake, compression, combustion (power), exhaust. I count power on every fourth stroke. Compression and exhaust are with the piston going up. A four-mode cycle gives power from a given cylinder on every other crank rotation. http://www.animatedengines.com/otto.shtml I think it's a misnomer to call a crank rotation a "stroke." The four strokes of a four-stroke ICE are as noted, so you get power on every fourth stroke. I can't tell from your post whether you agree with that. The poster confused me a little (nothing permanent). The lobe on the crank/cam still needs to turn four times... thus four strokes. I've always called it: intake, compression, power and exhaust. Counting combustion the same as the power stroke. |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
Smitty Two wrote:
In article , AMuzi wrote: Smitty Two wrote: In article , "hls" wrote: "SF Man" wrote in message news:i5e8na$2d7 FOUR STROKE: The reason most chain saws aren't four strokes, as far as I can tell, is that four strokes without oil pumps can't be placed in all the positions that a chain saw needs to be without spilling oil into the cylinder. TWO STROKE: The reason most chain saws are two strokes, I presume, is that is less expensive than a oil-pump driven four stroke and the two stroke works in any position. Where weight counts, as in a chainsaw, the two stroke cycle gives you power on every stroke where the 4 stroke cycle is only on every other stroke. That is really why. But to make a "run in any position" four stroke would increase the complexity. Here's what I remember from building the "Visible V-8" model when I was a kid: intake, compression, combustion (power), exhaust. I count power on every fourth stroke. Compression and exhaust are with the piston going up. A four-mode cycle gives power from a given cylinder on every other crank rotation. http://www.animatedengines.com/otto.shtml I think it's a misnomer to call a crank rotation a "stroke." The four strokes of a four-stroke ICE are as noted, so you get power on every fourth stroke. I can't tell from your post whether you agree with that. We all agree on what it is. How to describe that is semantically nebulous in modern English. In one sense strokes go up _and_ down so every fourth stroke is powered. In another sense every other full rotation has a powered half-turn, 'full revolution' being a more common use of the term 'stroke'. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
"Oren" wrote in message ... On Mon, 18 Oct 2010 09:12:57 -0700, Smitty Two wrote: Here's what I remember from building the "Visible V-8" model when I was a kid: intake, compression, combustion (power), exhaust. I count power on every fourth stroke. Compression and exhaust are with the piston going up. A four-mode cycle gives power from a given cylinder on every other crank rotation. http://www.animatedengines.com/otto.shtml I think it's a misnomer to call a crank rotation a "stroke." The four strokes of a four-stroke ICE are as noted, so you get power on every fourth stroke. I can't tell from your post whether you agree with that. The poster confused me a little (nothing permanent). The lobe on the crank/cam still needs to turn four times... thus four strokes. I've always called it: intake, compression, power and exhaust. Counting combustion the same as the power stroke. Am I mistaken, or does a "four stroke" fire on every other rotation? The ignition spark powers the crank down from a few degrees BTDC for power with all valves closed, and the upcoming piston pushes out the exhaust with the exhaust valve open. When it reaches TDC, the downward traveling piston sucks in gas through the open/opening intake valve, and when it reaches its designated firing degree BTDC, it fires. Every other stroke. With a two stroke, the spark plug fires every rotation, with the intake and exhaust being achieved by a porting system routing gas and exhaust on different sides of the piston. Class? Class? Steve Heart surgery pending? Read up and prepare. Learn how to care for a friend. http://cabgbypasssurgery.com |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
"Steve B" wrote in
: Am I mistaken, or does a "four stroke" fire on every other rotation? You're all mistaken. A "four stroke" is a teenage boy. That's how many strokes it takes him to "fire" when viewing online female-anatomical matter. -- Tegger |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
On Mon, 18 Oct 2010 15:14:49 -0700, "Steve B"
wrote: "Oren" wrote in message .. . On Mon, 18 Oct 2010 09:12:57 -0700, Smitty Two wrote: Here's what I remember from building the "Visible V-8" model when I was a kid: intake, compression, combustion (power), exhaust. I count power on every fourth stroke. Compression and exhaust are with the piston going up. A four-mode cycle gives power from a given cylinder on every other crank rotation. http://www.animatedengines.com/otto.shtml I think it's a misnomer to call a crank rotation a "stroke." The four strokes of a four-stroke ICE are as noted, so you get power on every fourth stroke. I can't tell from your post whether you agree with that. The poster confused me a little (nothing permanent). The lobe on the crank/cam still needs to turn four times... thus four strokes. I've always called it: intake, compression, power and exhaust. Counting combustion the same as the power stroke. Am I mistaken, or does a "four stroke" fire on every other rotation? The ignition spark powers the crank down from a few degrees BTDC for power with all valves closed, and the upcoming piston pushes out the exhaust with the exhaust valve open. When it reaches TDC, the downward traveling piston sucks in gas through the open/opening intake valve, and when it reaches its designated firing degree BTDC, it fires. Every other stroke. The spark ignition happens at the top of the compression stroke TDC (valves closed). When fuel/air is compressed and fired piston drops to BDC ready for the exhaust stroke (valves open). No? With a two stroke, the spark plug fires every rotation, with the intake and exhaust being achieved by a porting system routing gas and exhaust on different sides of the piston. Class? Class? Steve Heart surgery pending? Read up and prepare. Learn how to care for a friend. http://cabgbypasssurgery.com |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
Tegger ) writes:
"Steve B" wrote in : Am I mistaken, or does a "four stroke" fire on every other rotation? You're all mistaken. A "four stroke" is a teenage boy. That's how many strokes it takes him to "fire" when viewing online female-anatomical matter. Doesn't a teenage boy become a "two stroke", and a teenage girl a "four stroke", when coupled? -- Tegger |
How do you "tune up" a hard-to-start Craftsman 18" chainsaw
"Oren" wrote .. The spark ignition happens at the top of the compression stroke TDC (valves closed). When fuel/air is compressed and fired piston drops to BDC ready for the exhaust stroke (valves open). No? No. Spark happens, piston travels to bottom, on the upstroke, the exhaust valve opens, piston comes up, pushes out spent gas, at TDC, intake valve opens, piston drops pulling in air, comes up on compression stroke, and a few degrees BTDC, fires again. One spark per two full revolutions of crank. Steve |
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