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with a homogeneous mixture of diesel/air & the right a/f ratio-what CR is needed?
im interested in obtaining billet crankshaft/piston/connecting rod for a nitromethane rc engine & jacking up the compression/running it on pump diesel, with a carbureted homogeneous mixture of air & fuel & plenty of quench/no points in the combustion chamber, what compression ratio would be necessary for firing once heated up with a glow plug?
i know how a diesel works & i know the engine will need strong components to withstand detonation, what im looking for is the minimum compression ratio required for autoignition with a homogenous diesel/air mixture
Diesel engines are also more efficient than their gasoline counterparts because more power is produced as a result of the higher compression of the air/fuel mixture. Today’s gasoline engines have compression ratios of about 10:1 to 11:1, while the compression ratios in diesels can be as high as 25:1. The higher the compression ratio, the more power generated.
The much higher compression ratio means diesel engines have to be heavier and more robust. This means they are more expensive to build, but the higher cost is offset by much longer lifetimes. For instance, we’ve seen Mercedes-Benz diesels with 350,000 or more miles on the odometer running great on the original engine. Because of higher component weight and high compression ratios, diesels operate at lower rpms, producing lots of low end torque but less horsepower.
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