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What is the air fuel ratio in a Diesel cycle?

What is the stoichiometric a/f ratio in diesel engines?

  • The ideal or stoichiometric Air/Fuel ratio for many gasoline type hydrocarbon fuels is very close to 15:1, for diesel engines its vary to 18 to 70 .

What is the best air fuel ratio?

  • We mentioned the stoichiometric air-fuel ratio (14.7:1) that is the ideal ratio for lowest emissions, but this isn’t the best ratio for power. It used to be that 12.5:1 was considered the best power ratio, but with improved combustion chambers and hotter ignition systems, the ideal now is around 12.8:1 to 13.2:1.

What is the combustion ratio in diesel?

  • Diesel combustion is known to be very lean with A/F ratios of 25:1 at peak torque, 30:1 at rated speed/maximum power conditions, and over 150:1 at idle for turbocharged engines. Yet, this extra air does not enter into the combustion process. It is rather heated during combustion and exhausted-causing diesel exhaust to be lean.

image-What is the air fuel ratio in a Diesel cycle?
image-What is the air fuel ratio in a Diesel cycle?
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