Re: Question about what happens when the throttle

Posted by Rob on September 09, 2003 at 14:22:38 from (142.165.119.135):

In Reply to: Question about what happens when the throttle clos posted by Ron on September 09, 2003 at 13:02:15:

Are you talking gas, diesel or something like the old IHC's that started on gas and switched to diesel? Engine speed is controlled by throttle opening in both gas and diesels (but for different reasons) and has nothing directly to do with cylinder pressure. I'm not sure what you're asking. I think you might be confusing compression "pressure" with compression "ratio". Pressure is what you get using a compression tester gauge. It's somewhere around 150-175 psi in gas engines. Compression ratio is swept to unswept volume or the volume inside the cylinder and combustion chamber @ bdc versus the volume @ tdc. It's the ratio (e.g. 20:1) of those volumes. Diesels have much high ratios in order to cause the fuel to ignite due to the high heat caused by the compression. This effect in gas engines is pre-detonation or pinging. Now I'm confused!

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