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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#41
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Small Motor Seasonal Starting Saga Solved?
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#42
Posted to rec.crafts.metalworking
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Small Motor Seasonal Starting Saga Solved?
On Thu, 12 May 2011 19:29:43 -0500, jim
wrote: wrote: On Thu, 12 May 2011 13:15:28 -0500, jim wrote: wrote: On May 7, 5:50 pm, Joseph Gwinn wrote: I have a lawnmower and a snowblower, both from Honda, and both are hard to start at the beginning of their season. The lawnmower is the worst offender, by far, so I'll focus on it. I would always get the mower going, but it could take all day the first time. After that initial difficult start, starting was reasonably easy for the rest of the season. I have heard various theories on why this is so: 1. Gas varnished up over the winter. I took the carb apart - clean as a whistle. Nor did gas stabilizer make any difference. 2. Water (from condensation) in the gas. Hmm, hard to do with the 10% alcohol in all gas available these days. 3. Volatiles evaporating from the gas in the tank over the winter. Also, various stories saying that winter gas and summer gas are different, the difference being how volatile the gas is, with winter needing more volatile gas than summer. Hmm, this could be at least part of an answer. So, this year, when I first tried to start the lawnmower for the summer, had the usual problems. Tried the usual dodges, like leaving the mower out in the sun to warm up, and putting fresh gas in the tank, but no go. Volatiles? Ether! So, I gave it a squirt of starting fluid. Started right up on the first try, and subsequent starts were of normal difficulty, probably because all the old gas was by then flushed out of the carb. So, theory 3 seems to be correct. And a dash of Naptha in the gas may do the same. Joe Gwinn Ran the gas out of mine completely last fall, got some fresh 91 octane last week, filled the tank, it fired off in three pulls, needed another pull to keep going. Has a gravity feed tank. I've found 91 octane is needed with the alcohol contaminated gas for it to chop through the heavier weeds, otherwise it stalls. Difference in performance is quite noticiable. Briggs engine, about 25 years old. In the past, if I left gas in it, even if the float bowl was left dry I'd have to disassemble and hit all the parts with carb cleaner, then it would run. I also think the alcohol is the reason they're sticking 6 hp engines on the same mowers they used to put 3.5 hp engines. That and CA smog specs. Either that or the horses have shrunk down. The horses have shrunk down. I think what they were calling a 5 hp was practically identical to what they sold as 3.5 hp for 50 years. There was a Nationwide class action lawsuit against B&S. As a consequence they no longer use hp ratings. They are rated by torque. -jim Stan The REASON they now sell by torque is the HP rating was at 3600 RPM, and with the safely regulations today most lawn mowers are running their engines BELOW that speed - many only 2400 RPM A 6 hp motor at 3600 rpm is 8.75 ft lbs of torque. At 2400 RPM that's only something like 4 HP. Briggs was perfectly happy with using horsepower to rate their engines until they lost 51 million dollars in lawsuits because of proven false claims regarding horsepower rating. The courts ordered Briggs (and other small engine companies) to use the SAE standards for torque or horsepower as determined by an independent test facility for any claims they make. Previously the companies were just making up power ratings as they saw fit. After the court order Briggs quit giving horsepower ratings entirely rather than put the much lower hp rating back on the same engines as the court order would have required. Briggs took what for 50 years they called a 3.5 horsepower and simply lied and labeled it as a 5 or 6 horsepower. Then when they got caught they didn't want their fraud to be widely known so they came up with a story that horsepower is a lousy way to rate engines and torque is a much better way to rate small engines. From what I've read / heard, you are blowing more smoke than a 15 year old Briggs. Yes, the manufacturers were sued - but they were not NECESSARILY deceptive in their ratings. The engines WERE rated at a given stated RPM - and if run at that RPM with the torque ratings currently on the engines they WOULD produce (in most cases) the advertized horsepower. If you take the torque available at whatever RPM the engine is run at and multiply the two, then devide by 5252, you get the horsepower. Look at the Torque rating of any engine out there today, and multiply it by 3600, then devide by 5252, and you will find the result is extremely close to the HP the engine was formerly advertized/sold with. The ONLY engine description that cannot be argued is DISPLACEMENT - which is more and more becoming the standard way to advertize small engines. This rating still does not tell you a whole lot, because the power differs greatly depending on the engine design. Your weed eater, leaf blower, chain-saw etc will have a 30cc, 35cc, or 40cc etc engine., which may be producing , say 5HP from 40cc at 6000 RPM. (4 ft lbs of torque at 6000 RPM - being a 2 stroke engine) Your lawnmower may have a 135 cc or 8.24 cubic inches 4 stroke- roughly 3.5HP at 3600 RPM.. A 5HP L-Head Briggs was 12.5 cubic inches, or 204 cc. The same displacement OHV Intek engine is a 6.5HP engine at the same 3600 RPM due to higher volumetric efficiency and higher compression ratio. This translates to about 9.5 ft lbs torque at 3600 RPM - and the engine LIKELY produces a peak torque of about11 ft lb at 2400 RPM (5 HP), while the L- Head 5HP engine likely produced a peak HP of about 9.5ft lb at 2400, for a HP of about 4.25, and 7.2 ft lbs at 3600, for the 5HP rating. The torque drops off with speed due to poor breathing (volumetric efficiency) - the carting guys tune the intakes and exhausts to improve the efficiency, which increases the torque at higher speeds - producing more HP. |
#43
Posted to rec.crafts.metalworking
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Small Motor Seasonal Starting Saga Solved?
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#44
Posted to rec.crafts.metalworking
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Small Motor Seasonal Starting Saga Solved?
On Thu, 12 May 2011 21:52:29 -0500, jim
wrote: wrote: Briggs took what for 50 years they called a 3.5 horsepower and simply lied and labeled it as a 5 or 6 horsepower. Then when they got caught they didn't want their fraud to be widely known so they came up with a story that horsepower is a lousy way to rate engines and torque is a much better way to rate small engines. From what I've read / heard, you are blowing more smoke than a 15 year old Briggs. If your 15 year old briggs blows smoke its probably from bad maintenance. Yes, the manufacturers were sued - but they were not NECESSARILY deceptive in their ratings. The US federal court doesn't agree with you. It was deceptive advertising The engines WERE rated at a given stated RPM - and if run at that RPM with the torque ratings currently on the engines they WOULD produce (in most cases) the advertized horsepower. So how did a 3.5 horsepower engine get turned into a 6 hp engine? Your claiming they did it by making it run slower which is nonsense. They did it by slapping a 6 hp label on it. If you take the torque available at whatever RPM the engine is run at and multiply the two, then devide by 5252, you get the horsepower. Look at the Torque rating of any engine out there today, and multiply it by 3600, then devide by 5252, and you will find the result is extremely close to the HP the engine was formerly advertized/sold with. That mumbo mumbo doesn't explain how they turned a 3.5 engine into a 6 hp when the only real difference was a fancy plastic shroud on the exterior. And yes the current torque ratings are accurate, but you can't compare to what the engine used to be rated at, because they didn't give torque ratings before. Horse power ratings are now required to be done by dyno testing random engines off the assembly line. They can't just do some silly calculations and call it a 6 hp engine. Briggs won't tell you what the current hp rating is. Not true. Their HP ratings are/were SAE spec dyno ratings. The 6HP engine was larger displacement than the 3.5 Try buying pistons and cranks. The 3.5HP L-Head was 148cc The 6HP OHV Vangard was 182cc, the 6HP Intek 190cc, and the 6HP Quantum was 189.6 cc (lets just call it 190) |
#45
Posted to rec.crafts.metalworking
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Small Motor Seasonal Starting Saga Solved?
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#46
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Small Motor Seasonal Starting Saga Solved?
On Fri, 13 May 2011 06:01:48 -0500, jim "sjedgingN0Sp"@m@mwt,net
wrote: wrote: Horse power ratings are now required to be done by dyno testing random engines off the assembly line. They can't just do some silly calculations and call it a 6 hp engine. Briggs won't tell you what the current hp rating is. Not true. Their HP ratings are/were SAE spec dyno ratings. The 6HP engine was larger displacement than the 3.5 Try buying pistons and cranks. The 3.5HP L-Head was 148cc The 6HP OHV Vangard was 182cc, the 6HP Intek 190cc, and the 6HP Quantum was 189.6 cc (lets just call it 190) That has little to do with the fraud that Briggs was sued over. The case started in the Illinois courts in 2003 against MTD and Briggs MTD caved in and settled then MTD gave evidence against Briggs In 2008 it was moved into federal court as a class action At about the same time Fraud and RICO charges were filed against Briggs and most of the other small engine mfgs. In 2010 Briggs agreed to settle for 51 million. The horsepower misrepresentation that Briggs and other small engine makers engaged in occurred from 1994-2008 the misrepresentations ended when Briggs stopped using hp ratings So their torque ratings are more to be trusted than their HP? Why? IF it WAS actually fraud, it is just as easy to misrepresent torque. Any of the numbers I've seen, torque vs HP, work out REAL close. (at 3600 RPM) The only reason it could have been construed as fraudulent would be if the rated RPM was higher than the operating RPM - which it has been since 1996 or there-abouts. The 6HP engine was only 4.5 or 5 because it didn't run at it's rated RPM. |
#47
Posted to rec.crafts.metalworking
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Small Motor Seasonal Starting Saga Solved?
Ed Huntress wrote:
Holy cow. You get this week's "What, Me Worry?" award. g You're in a class with my cousin (now deceased, but for other reasons). He was in the First Marine Division in Laos and Vietnam, and he used to tell how he heated his coffee by burning a wad of C4. I guess it burns nicely, but I'm not likely ever to find out, first-hand. Heck, Ed, I've done that. It burns hot and sparkles a lot. But it takes a LOT of C4 to heat anything. It's gone so fast it doesn't have much time to transfer heat. -- Richard Lamb http://www.home.earthlink.net/~cavelamb http://www.home.earthlink.net/~sv_temptress |
#48
Posted to rec.crafts.metalworking
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Small Motor Seasonal Starting Saga Solved?
"CaveLamb" wrote in message m... Ed Huntress wrote: Holy cow. You get this week's "What, Me Worry?" award. g You're in a class with my cousin (now deceased, but for other reasons). He was in the First Marine Division in Laos and Vietnam, and he used to tell how he heated his coffee by burning a wad of C4. I guess it burns nicely, but I'm not likely ever to find out, first-hand. Heck, Ed, I've done that. It burns hot and sparkles a lot. But it takes a LOT of C4 to heat anything. It's gone so fast it doesn't have much time to transfer heat. What I want to know is, who was the first guy to try this? Here in NJ we have these big myths about the first guy to eat a tomato. But I would think that the first guy to heat his coffee over flaming C4 deserves a statue somewhere, doesn't he? Or a line on his headstone, "Here, hold my beer and watch this..." -- Ed Huntress |
#49
Posted to rec.crafts.metalworking
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Small Motor Seasonal Starting Saga Solved?
In article ,
"Ed Huntress" wrote: "CaveLamb" wrote in message m... Ed Huntress wrote: Holy cow. You get this week's "What, Me Worry?" award. g You're in a class with my cousin (now deceased, but for other reasons). He was in the First Marine Division in Laos and Vietnam, and he used to tell how he heated his coffee by burning a wad of C4. I guess it burns nicely, but I'm not likely ever to find out, first-hand. Heck, Ed, I've done that. It burns hot and sparkles a lot. But it takes a LOT of C4 to heat anything. It's gone so fast it doesn't have much time to transfer heat. What I want to know is, who was the first guy to try this? Here in NJ we have these big myths about the first guy to eat a tomato. But I would think that the first guy to heat his coffee over flaming C4 deserves a statue somewhere, doesn't he? Or a line on his headstone, "Here, hold my beer and watch this..." The standard way to dispose of old dynamite is to burn it out in the open, in small quantities. From a distance. Joe Gwinn |
#50
Posted to rec.crafts.metalworking
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Small Motor Seasonal Starting Saga Solved?
"Joseph Gwinn" wrote in message ... In article , "Ed Huntress" wrote: "CaveLamb" wrote in message m... Ed Huntress wrote: Holy cow. You get this week's "What, Me Worry?" award. g You're in a class with my cousin (now deceased, but for other reasons). He was in the First Marine Division in Laos and Vietnam, and he used to tell how he heated his coffee by burning a wad of C4. I guess it burns nicely, but I'm not likely ever to find out, first-hand. Heck, Ed, I've done that. It burns hot and sparkles a lot. But it takes a LOT of C4 to heat anything. It's gone so fast it doesn't have much time to transfer heat. What I want to know is, who was the first guy to try this? Here in NJ we have these big myths about the first guy to eat a tomato. But I would think that the first guy to heat his coffee over flaming C4 deserves a statue somewhere, doesn't he? Or a line on his headstone, "Here, hold my beer and watch this..." The standard way to dispose of old dynamite is to burn it out in the open, in small quantities. From a distance. Joe Gwinn "Distance" being an important point in this case. g That's how I get rid of ancient gunpowder, too. That is, I did, until I realized that it was probably a good addition to my compost pile. 'Too bad I don't shoot black powder anymore. There is some Red Dot on the compost pile right now, however. -- Ed Huntress |
#51
Posted to rec.crafts.metalworking
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Small Motor Seasonal Starting Saga Solved?
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#52
Posted to rec.crafts.metalworking
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Small Motor Seasonal Starting Saga Solved?
On Sat, 14 May 2011 10:44:28 -0400, Joseph Gwinn
wrote: In article , "Ed Huntress" wrote: "CaveLamb" wrote in message m... Ed Huntress wrote: Holy cow. You get this week's "What, Me Worry?" award. g You're in a class with my cousin (now deceased, but for other reasons). He was in the First Marine Division in Laos and Vietnam, and he used to tell how he heated his coffee by burning a wad of C4. I guess it burns nicely, but I'm not likely ever to find out, first-hand. Heck, Ed, I've done that. It burns hot and sparkles a lot. But it takes a LOT of C4 to heat anything. It's gone so fast it doesn't have much time to transfer heat. What I want to know is, who was the first guy to try this? Here in NJ we have these big myths about the first guy to eat a tomato. But I would think that the first guy to heat his coffee over flaming C4 deserves a statue somewhere, doesn't he? Or a line on his headstone, "Here, hold my beer and watch this..." The standard way to dispose of old dynamite is to burn it out in the open, in small quantities. From a distance. Joe Gwinn MOVING old dynamite can be an issue...seriously. Particularly if its leaked...... Gunner -- "If I say two plus two is four and a Democrat says two plus two is eight, it's not a partial victory for me when we agree that two plus two is six. " Jonah Goldberg (modified) |
#53
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Small Motor Seasonal Starting Saga Solved?
On Sat, 14 May 2011 11:58:45 -0500, jim "sjedgingN0Sp"@m@mwt,net
wrote: wrote: The horsepower misrepresentation that Briggs and other small engine makers engaged in occurred from 1994-2008 the misrepresentations ended when Briggs stopped using hp ratings So their torque ratings are more to be trusted than their HP? Why? IF it WAS actually fraud, it is just as easy to misrepresent torque. Any of the numbers I've seen, torque vs HP, work out REAL close. Yes their torque ratings are more to be trusted, but only because their previous misrepresentation had made their horsepower rating highly suspect. Since they have been under court order to only put on the label what an independent SAE tester determines is the power rating briggs has not revealed the horsepower ratings. So if they came out real close for you it's because your calculations made them come out real close. No. horsepower and torque are directly related. If they tell you the torque rating anyone can determine the HP rating, knowing the running RPM. (at 3600 RPM) The only reason it could have been construed as fraudulent would be if the rated RPM was higher than the operating RPM - which it has been since 1996 or there-abouts. The 6HP engine was only 4.5 or 5 because it didn't run at it's rated RPM. I own a lawnmower that I bought new in 2002. It has the same block, piston, crank, valves as what used to be called a 3.5 hp. It had a label on the shroud that said 5.5 hp. According to the lawsuit Briggs also labeled that same basic engine as a 4hp, 4.5hp, 5hp, and 6hp engine. Well the 3.5 hp engine on my little mower (about 2006) IS DEFINITELY NOT the same as my neighbour's 4HP, and the 6 at the airport is totally different again. Read the court documents. It has nothing to do with RPM. It has nothing to do with safety or emissions. They simply changed the external appearance of some engines and labeled them as having more horsepower. The 3.5 is the only specific engine size that I remember, but there was a number of different larger engines where they did similar misrepresentations . And other small engine makers were in on it also. But it sounds like Briggs was the first and most egregious violator. They got caught and one of the consequences was they discontinued using horsepower ratings and now use torque ratings. |
#54
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Small Motor Seasonal Starting Saga Solved?
Gunner Asch on Sat, 14 May 2011 10:37:33 -0700
typed in rec.crafts.metalworking the following: But it takes a LOT of C4 to heat anything. It's gone so fast it doesn't have much time to transfer heat. What I want to know is, who was the first guy to try this? Here in NJ we have these big myths about the first guy to eat a tomato. But I would think that the first guy to heat his coffee over flaming C4 deserves a statue somewhere, doesn't he? Or a line on his headstone, "Here, hold my beer and watch this..." The standard way to dispose of old dynamite is to burn it out in the open, in small quantities. From a distance. Joe Gwinn MOVING old dynamite can be an issue...seriously. Particularly if its leaked...... Or frozen. I remember a movie with that plot line - they needed to blast something, and the only dynamite they had, had been in a mine shaft forever, and some had sweated. And the road wasn't paved. The trucks needed new shocks. And then the rains came. I don't know if the natives were hostile ... but ... Gunner -- pyotr filipivich We will drink no whiskey before its nine. It's eight fifty eight. Close enough! |
#55
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Small Motor Seasonal Starting Saga Solved?
On 05/20/2011 04:12 PM, pyotr filipivich wrote:
Gunner on Sat, 14 May 2011 10:37:33 -0700 typed in rec.crafts.metalworking the following: MOVING old dynamite can be an issue...seriously. Particularly if its leaked...... Or frozen. I remember a movie with that plot line - they needed to blast something, and the only dynamite they had, had been in a mine shaft forever, and some had sweated. And the road wasn't paved. The trucks needed new shocks. And then the rains came. I don't know if the natives were hostile ... but ... The dynamite was needed to blow out the fire on a burning oil well. Starred Steve McQueen, IIRC. -- Bob Nichols AT comcast.net I am "RNichols42" |
#56
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Small Motor Seasonal Starting Saga Solved?
On Fri, 20 May 2011 20:27:32 -0500, Robert Nichols
wrote: On 05/20/2011 04:12 PM, pyotr filipivich wrote: Gunner on Sat, 14 May 2011 10:37:33 -0700 typed in rec.crafts.metalworking the following: MOVING old dynamite can be an issue...seriously. Particularly if its leaked...... Or frozen. I remember a movie with that plot line - they needed to blast something, and the only dynamite they had, had been in a mine shaft forever, and some had sweated. And the road wasn't paved. The trucks needed new shocks. And then the rains came. I don't know if the natives were hostile ... but ... I remember that movie, but the name doesn't come to mind. The dynamite was needed to blow out the fire on a burning oil well. Starred Steve McQueen, IIRC. Y'mean "Hellfighters", starring John Wayne? Great, fun movie. http://www.imdb.com/title/tt0063060/ The great thing about getting older is that you don't lose all the other ages you've been. -- Madeleine L'Engle |
#57
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Small Motor Seasonal Starting Saga Solved?
"Larry Jaques" wrote in message ... On Fri, 20 May 2011 20:27:32 -0500, Robert Nichols wrote: On 05/20/2011 04:12 PM, pyotr filipivich wrote: Gunner on Sat, 14 May 2011 10:37:33 -0700 typed in rec.crafts.metalworking the following: MOVING old dynamite can be an issue...seriously. Particularly if its leaked...... Or frozen. I remember a movie with that plot line - they needed to blast something, and the only dynamite they had, had been in a mine shaft forever, and some had sweated. And the road wasn't paved. The trucks needed new shocks. And then the rains came. I don't know if the natives were hostile ... but ... I remember that movie, but the name doesn't come to mind. The dynamite was needed to blow out the fire on a burning oil well. Starred Steve McQueen, IIRC. Y'mean "Hellfighters", starring John Wayne? Great, fun movie. http://www.imdb.com/title/tt0063060/ The great thing about getting older is that you don't lose all the other ages you've been. -- Madeleine L'Engle Steve McQueen wasn't in Hellfighters that was Jim Hutton. It also wasn't the movie Gunner was talking about. That movie was either, The Wages of Fear with Yves Mauntand or the remake,Sorcerer with Roy Scheider. If it was the remake, then it wasn't sweating dynamite, but unstable nitroglycerin. Paul K. Dickman |
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