Half a croissant, on a plate, with a sign in front of it saying '50c'
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2-stroke Diesel
Convert a 4 stroke to a two stroke
 
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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%.
mhuppertz, Aug 30 2005


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       Are there not already 2-stroke diesels?   

       Not following the "no dilution" part of this idea.
bristolz, Aug 30 2005
   

       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.
5th Earth, Nov 14 2005
   

       I like your link title's extension of the baking metaphor, [sophocrat].
Adze, Nov 14 2005
   

       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.   

       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.   

       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.   

       Hmm. Ought to be a patent here somewhere, but I can't be bothered.
Cosh i Pi, Apr 11 2007
   

       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
randylandy666, Jul 26 2007
   


 
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