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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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#1
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Posted to rec.crafts.metalworking
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Robert Swinney wrote:
Now that this inane and totally ridiculous thread has been opened, I wonder how long it'll be before we get around to the 100 mpg carburetor -- you know the one the oil companies have been squashing since the 1920's. Oh! Wait -- I think I saw some on ebay just the other day. Actually, if you get rid of the throttle, and control the engine by varying the fuel flow, you can get a decent increase in efficiency - by reducing pumping loss to zero. Oh, but there are some problems -- mostly getting gasoling to not knock. And, BOY, when it runs quite lean, it can REALLY knock. My family's ram van with the 5.9 L V-8 had a momentary computer malfunction of some sort (I'm guessing) once while climbing a long hill, and it suddenly knocked so hard I thought it had thrown a rod. I let up on the gas immediately, expecting the engine to seize on the spot, but it didn't, and never did that again. Didn't even turn on the check engine light. My guess is some register in the fuel metering PWM circuits got loaded with a wrong value, and one cylinder was only getting splash from the nearby injectors, or something. But, those were the biggest knocks I'd ever heard a gas engine produce. I've always wanted to try building a stratified-charge gas engine, just to see what sort of fuel economy it could provide. Probably no better than a mediocre Diesel, though. Jon |
#2
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On Sep 27, 1:02 am, Jon Elson wrote:
Robert Swinney wrote: Now that this inane and totally ridiculous thread has been opened, I wonder how long it'll be before we get around to the 100 mpg carburetor -- you know the one the oil companies have been squashing since the 1920's. Oh! Wait -- I think I saw some on ebay just the other day. Actually, if you get rid of the throttle, and control the engine by varying the fuel flow, you can get a decent increase in efficiency - by reducing pumping loss to zero. Oh, but there are some problems -- mostly getting gasoling to not knock. And, BOY, when it runs quite lean, it can REALLY knock. My family's ram van with the 5.9 L V-8 had a momentary computer malfunction of some sort (I'm guessing) once while climbing a long hill, and it suddenly knocked so hard I thought it had thrown a rod. I let up on the gas immediately, expecting the engine to seize on the spot, but it didn't, and never did that again. Didn't even turn on the check engine light. My guess is some register in the fuel metering PWM circuits got loaded with a wrong value, and one cylinder was only getting splash from the nearby injectors, or something. But, those were the biggest knocks I'd ever heard a gas engine produce. I've always wanted to try building a stratified-charge gas engine, just to see what sort of fuel economy it could provide. Probably no better than a mediocre Diesel, though. Jon I had a 1978 Honda Accord with a CVCC prechamber stratified-charge engine. It gave 36-38MPG in the summer, 30-32 in the winter, and up to 44 on a long trip; NH to VA on one tank. Interior space and comfort were almost identical to 2 friends' Saab 900s, handling was a little better. I think it was the last car to pass emissions without a catalytic converter. It got around 70HP from 1.6L, which was fine around town in NH but not really great on the Interstate in MA where traffic is fast, heavy and aggressive. I gave it up for a 4WD pickup truck with an NRA sticker on the back, which got considerably more respect even though it wasn't much faster (2.3L engine, 28MPG). Jim Wilkins |
#3
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Jim Wilkins wrote:
I had a 1978 Honda Accord with a CVCC prechamber stratified-charge engine. It gave 36-38MPG in the summer, 30-32 in the winter, and up to 44 on a long trip; NH to VA on one tank. My '76 Checy Vega could do the same. Your engine was stratified charge, but it still had throttles, and controlled power output by reducing the air intake. Interior space and comfort were almost identical to 2 friends' Saab 900s, handling was a little better. I think it was the last car to pass emissions without a catalytic converter. It got around 70HP from 1.6L, which was fine around town in NH but not really great on the Interstate in MA where traffic is fast, heavy and aggressive. I gave it up for a 4WD pickup truck with an NRA sticker on the back, which got considerably more respect even though it wasn't much faster (2.3L engine, 28MPG). Hmm, 2.3 L sounds like a Luv, that had the same engine as the Vega, but obviously not the same gears. I have always wondered if my Vega had the auto trans axle by mistake, with a 4-speed manual trans. First gear would get you to 45+ MPH. Anyway, Detroit auto co's played around with direct-injection stratified charge engines in the 60's and 70's. No throttle, just like a diesel, and some kind of pump similar to a Diesel's but able to pump gasoline without damage to the pump. Jon |
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