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AFR explained a little better please??

 
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Old 05-17-2016, 01:44 PM
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AFR explained a little better please??

been reading up on efficient fuel mixtures and how 14.7:1 is an ideal mixture.. although no one explained what the word "part" equates to.. like is the air compared to how much air takes up a 1-2 Liter bottle? what does the "part" represent?
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Old 05-17-2016, 06:14 PM
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Re: AFR explained a little better please??

It means there are 14.7 parts air to 1 part fuel, i.e. to burn 1L of fuel you would need 14.7L of air. This is what's known as the "stoichiometric" AFR and is the ideal circumstances to get a complete burn at atmospheric pressure, and the exact numbers vary depending on fuel type. Because running a lean mixture (too much air) produces a hotter burn, most cars tend to run a bit rich (more towards 13:1 or even 12:1) especially in the higher rpm to keep the exhaust gas temperatures lower and protect the motor. This also acts as a safeguard against knocking if poor quality fuel is used.
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