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On 01/14/2013 05:39 PM, Shirley M?rquez D?lcey wrote: > On modern cars there is no timing that a mechanic can adjust; that's a > throwback to the days of carburetors and camshafts. Nowadays cars have > electronic fuel injection and electronically controlled valves and the > timing is all done by the engine computer. If the computer is > programmed competently, when it notices repeated knocking it will > change the engine timing to make it stop; it's already making changes > to deal with engine temperature, altitude, and mechanical wear. The > catch is that this may cause a severe performance drop in an engine > designed for high octane fuel, not the mere 10HP that somebody alluded > to. You are mostly correct. The only difference is that the "chip" (It's really/usually just a [EE]PROM) contains the tuning parameters for the engine. If you want to run on economical fuel you need to modify/change this chip. Most modern cars can use a programmer like this: http://www.jegs.com/i/Superchips/848/1950/10002/-1 Like I said, knock sensors only detect knocks after the fact. They do reduce knock damage, but do not eliminate it. > _______________________________________________ > Discuss mailing list > Discuss at blu.org > http://lists.blu.org/mailman/listinfo/discuss
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