Quote:
Originally Posted by Old Tele man
...the direct injection both cools the cylinder and allows it to ingest 100% air--rather than the typical less dense A/F-mixture--during the intake stroke. This permits the use of higher CR because the fuel is NOT present during the compression portion of the intake stroke, and is only present at the instant combustion is appropriate to occur (assuming properly 'timed' injection/ignition calculations).
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Wouldn't the direct injection eliminate pre-detonation? What is the limiting factor on CR if the fuel is directly injected? Can't we just go 20/1 and run the gas engine like a heat engine with no spark plugs?