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#11
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Sport Pilot wrote:
The model diesel engines will not turn as fast as the gas or methanol/nitro engines because the fuel (ether and kerosene) will not burn as fast. I say again: there is no magic rule that says "diesel burns slower" than gasoline. Increasing the boost pressure can increase the burn rate AS MUCH AS YOU WANT. Its just not done most of the time, because no one WANTS a 7000 RPM engine when a 4000 RPM engine is available to do the same job. People only build 7000 RPM engines when there's no other way to get the power. This is because the fuel burns slower, not because of the cycle, because all, the spark ignition gas engine, the glow plug methanol/nitro engine, and the compression ignition engine, are actually otto cycle engines. No, that's already been covered. Diesel (true diesel with either direct or pre-chamber injection) is a subtly different cycle than the Otto cycle. Its constant-pressure combustion instead of constant-volume combustion. |
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