Spark Plug Gap

G

gary678*

Senior Member
I have a 12 volt system, 6.1 Snyder's head, and a Pertronix Flame Thrower 3.0 OHM Coil (40611). Conventional wisdom says with a high compression head that the gap should be .030-.032. However with the Pertronix head the gap can be moved to as much as .040. Experiences? Suggestions? Thank you for any info. Gary D.
 
My understanding is that the .040 capability is just that - a capability. You could do it if you needed to, but I haven't seen anyone actually need to do it on these engines.
 
Try .032" for a while, then try .035" for a while to compare. Every engine/components are different.
You may also try .030".
 
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Yep, I agree. Start out small and keep increasing the gap, see what happens.

That coil appears to come either oil or epoxy filled. Do you know what you have ?
 
Increasing point gap advances timing. and decreases dwell time. Timing advance is only a few degrees and not consequencial on a a driver A. To much gap with decreased dwell decreases and weakens spark voltage. Modern electroniuc ignitions automatically compensate.
 
gary678* said:
I have a 12 volt system, 6.1 Snyder's head, and a Pertronix Flame Thrower 3.0 OHM Coil (40611). Conventional wisdom says with a high compression head that the gap should be .030-.032. However with the Pertronix head the gap can be moved to as much as .040. Experiences? Suggestions? Thank you for any info. Gary D.
Click to expand...

No experiences with your coil. Experiment, right down what you did and how it behaved ! Have fun going for test drives ( make the drives on the same roads)
 
PC/SR said:
Increasing point gap advances timing. and decreases dwell time. Timing advance is only a few degrees and not consequencial on a a driver A. To much gap with decreased dwell decreases and weakens spark voltage. Modern electroniuc ignitions automatically compensate.
Click to expand...

I think he is asking about the plug gap, not the points gap.
 
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