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   ocr: There are several ditterent types of knock, (also called preignition). Knock is a compleH subject and will only be discussed briefly here. Knock can be controlled by a combination of: reducing the compression ratio, enriching the Tuel-air ratio, insuring that in the design there are no 'hot spots - like ouerneated exhaust valves that can cause the fuel to be ignited prematurely, and by raising the fuel octane rating. Fuel octane rating is, in my experience, one of the least understood gas engine concepts. The octane rating is actually al measure of how resistant the fuel is to knock. Itl has n ...