h a l f b a k e r y
Breakfast of runners-up.
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To cut frictional losses nearly in half, sping the camshaft the came speed as the crank, use a positive displacement blower to scavenge the cylinders, and turn a 4 stroke diesel into a two stroke. Since the fuel is added at TDC when that valves are closed no dilution would occur. I predict the mileage
would go up 40%.
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Are there not already 2-stroke diesels? |
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Not following the "no dilution" part of this idea. |
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I don't think this will work... The intake on a 2-stroke is in a totaly different location in the cylinder than on a 4-stroke. |
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I like your link title's extension of the baking metaphor, [sophocrat]. |
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This can be done, and I'm pretty sure it has been done quite a few times. All you need is a different camshaft (you wouldn't even need to change the camshaft drive - each cam would just have two lobes instead of one) and a turbocharger. |
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However, you wouldn't get improved mpg - it would actually be a bit worse. What you would get is maybe 40% more power out of the same engine. It would also be that much more difficult to prevent overheating. |
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The really cunning trick would be to have an engine that could change from one to the other on the fly, so you'd be four-stroke most of the time, but two-stroke at moments of peak demand. |
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Hmm. Ought to be a patent here somewhere, but I can't be bothered. |
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i reckon you could use the same cam
the order of operations of a 4 stroke is
1.suck 2.squeeze 3.bang 4.blow starting at TDC
you would have to change the order it is
1.bang 2.blow 3.suck 4. squeeze
but the ideal would be
1.bang 2.suck/blow 3. squeeze
the timings would be
1.0-90deg 2.90-270deg exhaust just before intake and intake closing just after exhaust 3.270-360
any ideas on my theory?
thanks
Nick |
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