On 01/14/2013 05:39 PM, Shirley Márquez Dúlcey 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.
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