Quote:
Originally Posted by all american boy
Anybody know how long you have to run engine to get a new 'burn pattern'
on the spark plugs?
So you can take them out and read them.
Do know there are three running conditions or circuits in the carburetor.
Idle, cruising and acceleration.
Trying to figure out how to get the plugs to change to new patterns after changes in the engine.
Sure know what the spark plug chart from Champion looks like.
Use to see them on the counter at NAPA stores.
Always looked at them but never did enough spark plug checks.
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It doesn't take long. For a full throttle reading standard procedure is to immediately cut the ignition at the end of a run, shift to neutral, stop and read the plugs or get towed back to the pits and read the plugs. If you let the engine idle after the run, your plug reading will be worthless!
For example, you may be lean at full throttle (plugs will be white) but too rich at idle (plugs black/dark) so if you idle back to the pits and read the plugs, you may think it's running rich and jet down some more. Next run burned pistons and you don't know why!!