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Originally Posted by Rick & Connie
A two stroke engine is only about 27% efficient in combusting gasoline.And around 29% efficient in combusting diesel fuel.
A four stroke piston engine is about 30% efficient in combusting gasoline.And around 37% efficient in combusting diesel fuel?
A rotory engine is about 29% efficient in combusting gasoline.(due to compression losses on the ends of the rotor.)
While a jet engine is somewhere in the 90% range for efficiently combusting fuel.
This is where I'm starting this discussion.If any of my information is flawed,please tell me so.
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This is the piece of info I'm having a problem with. Is it your understanding that a 4 stroke gas engine only burns 30% of the available fuel in the combustion chambers, and that 70% is unburned and goes to the catalytic converter or the environment? If that's what you're saying, I would respectfully ask for the basis of that information. I believe you have some incorrect information. I could not find a reference for the normal percentage of Incomplete Combustion in a 4 stroke gas engine, but I have one reference that states it is "very small." My best guess is that the amount of unburned fuel leaving the cylinders is a couple of percent or less. I suspect the 30% value you are quoting is an approximate value for the overall engine efficiency, including combustion, mechanical, and thermodynamic efficiencies.