![]() ![]() Ignition Timing Control – Open Loopįor open loop systems commonly used in a carburetor or mechanical fuel injection: Ignition timing trendsĪs RPM increases, more ignition timing is neededįor higher octane fuels, more timing is needed due to slower flame speedįor large combustion chambers, more ignition timing is neededįor forced induction, less timing is needed because of faster flame speedįor emission controls, less timing is used to reduce smog compoundsįor richer fuel mixtures, more timing is needed due to slower flame speedįor alcohol fuels that are run richer than gasoline fuels, more timing is typicalįor nitro fuels that are richer than methanol fuels, even more timing is typical. ![]() This is done with a combination of initial advance, plus centrifugal or electronic controlled advance for engine speed, plus vacuum or electronic advance for engine loading and throttle effect. Best power is achieved when ignition timing is set to fire the spark ahead of time to reach that peak pressure at about 2 degrees after TDC.
0 Comments
Leave a Reply. |