6.8 What sort of engine is used to rate fuels?
Description
This article is from the Gasoline FAQ, by Bruce Hamilton with numerous contributions by others.
6.8 What sort of engine is used to rate fuels?
Automotive octane ratings are determined in a special single-cylinder engine
with a variable compression ratio ( CR 4:1 to 18:1 ) known as a Cooperative
Fuels Research ( CFR ) engine. The cylinder bore is 82.5mm, the stroke is
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