Robby Davenport wrote:
what diesel engines(small pref.) were high compression 20+:1 seems
they would make higher eff. and would burn must any fuel
High compression makes for better economy to a point. However, static
compression ratio is not the best measure to predict overall engine
efficiency. The ill-reputed GM 5.7 liter diesel utilized a compression ratio
of 22:1 (and it was an economical engine), but once those factory head bolts
stretched (from even a single overheating experience), the engine never
seemed to work properly again. (Never re-use head bolts on the 5.7 liter GM
diesel--aftermarket ones pretty well solve the overheating problem!)
Most turbo diesels use lower compression--some as low as 18:1. The turbo
allows for greater cylinder filling, effectively raising compression
pressure, which is more significant than the static ratio. From an
efficiency perspective, no other heat engine beats a turbo diesel. Even most
fuel cells have a long way to go before they catch up!
robert luis rabello
Biofuel at Journey to Forever:
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