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Advance curves - why so many.....

From: Hank Dozier
Remote Name:
Date: January 29, 2003
Time: 16:45:41


The reasoning for so many advance curves are the engine types and the applications. Without trying to get into a whole lot of "engineering-ese", within a set type of engine (by combustion chamber design), the advance curves will change based on compression ratio, camshaft events (especially amount of overlap), carburetion, bore/stroke ratio, octane rating of the fuel, exhaust backpressure, and thermostat temperature. The MAJOR players here are compression ratio, octane of fuel, and camshaft. That said, it is quite possible that you can get good performance in, say a poly engine, with a LA wedge distributor. Reasoning here is that the wedge is more advance limited than the poly for a given octane. BUT, you might be giving up some fuel economy. As for the electronic distributors having "brains", that is not really the case, unless they are computer (ECM/ECU/PCM, etc) controlled. All the electronic breakerless box does is take the VRS or Hall signal and use it in place of points, with the major benifit of having better dwell control than points could ever do! A breakerless electronic distributor out of an LA engine is BETTER than a dual point distributor in this regard. Plus, no moving parts to wear out except the rotor.


Last changed: July 19, 2018