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Old 04-15-2003, 06:55 PM   #10
jcochran
Scooby Newbie
 
Member#: 18297
Join Date: May 2002
Location: Casper, WY
Vehicle:
2008 STi
Lightning Red

Default Miller Cycle

Quote:
Originally posted by Jon [in CT]
dlowman, do you know for certain that neither the Evo nor the STi leave the intake valves open for a portion of the compression cycle, effectively reducing the "final" compression ratio? This strategy is, of course, a prime feature of a Miller cycle engine. Is it inconceivable that one or both of these engines are, in fact, Miller cycle but choose not to advertise/emphasize it?

And how do you account for the Evo's significantly higher effective compression ratio, relative to the US STi's?
I was under the impression that Miller Cycle engines required a supercharger to constantly provide boost to compress against during the compression stroke. Is there a turbocharged Miller Cycle engine somewhere in production?

James
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