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Re: Re: Benefits of higher compression?.
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Posted by Additionally...Jerry/MT on June 26, 2004 at 18:08:08 from (206.231.186.93):
In Reply to: Re: Benefits of higher compression?. posted by Jerry/MT on June 26, 2004 at 17:46:25:
I should have said that for a given displacement engine, increaseing the compression ratio will give you more power and thus reduced specific fuel consumption.(Remember the sprk ignition engine runs at essentially constant fuel to air ratio so if the engines have the same displacement, they will have the airflow at a given rpm and hence the same fuel flow.) The pressures and temperature will be much higher at the end of the compression stroke in the high compression engine.(ideally, compression pressure = atmospheric pressure x (compresion ratio)^1.4 where 1.4 is an exponent) if you compare ideal presures for a 6.0 compression ratio to say compression ratio 8.0, the ideal pressure at end of the compression strokeis approximately 50 % greater. The temperature are also significantly greater. And we haven't ignited the mixture yet! sot he peak pressure and temperatures are much higher so the force on the top of the piston is very greatly increased and that's what makes the power! hope this helps you.
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