Quote:
Originally Posted by Joe's_cool_1le
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The 6509 are direct replacement 1 heat range colder, so we are on the same page here.
We typically don't close the gap unless we need to.
Of coarse closing the gap recommendation is a safe one, you really can't go wrong here as some cars ignition systems are weaker than others or wires might not be up to task for full throttle boosted applications.
Closing the gap can reduce throttle response, fuel economy, induce trailer hitching.
A larger gap will give better burn, allow us to burn more fuel, complete combustion, when the ignition system is up to par.
If we have to close the gap we start looking at the ignition system for weaknesses.
We will go after boosting the ignition system voltage, and better wires, and keep the gap at 0.042.
Ted.