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Re: High Compression Pistons


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Posted by CenTex Farmall on December 08, 2012 at 06:41:00 from (64.134.185.175):

In Reply to: High Compression Pistons posted by SweetFeet on December 08, 2012 at 03:03:09:

As you go up, air is less dense and there are two effects on internal combustion engines. One is that the air/fuel mixture will lean out and the other is that the dynamic compression ratio will change.

Compression ratio is the change in volume from when the piston is at the bottom of the stroke to the top of the stroke has a significant effect on engine power. By adding more and more dome to a piston and changing the static compression ratio, a manufacturer could maintain the same power in say, Denver as they could in Houston. If you take that same "high altitude" engine and move it to Houston, it will make more power than the lower compression engine but it will be more picky about fuel and ignition timing.

Aircraft with piston engines work these problems by a pilot operated mixture control and with turbocharching.


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