Quote:
Originally Posted by swamp2
The basic phenomena is that fuel (roughly 15% of a premixed charge)
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Check your math. Stoichiometric ratio is 14.7:1 (a good average to use), which means 1 of 15.7 mass units is fuel, or 6.4%. Even a super rich 12.5:1 ratio adds up to 7.4%, not 15%. But that's irrelevant.
Bottom line is you're not getting even close to 6.4% power increase with DI alone on a high performance engine. Main reason for DI is EMISSIONS, not power.