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Pertronix
- Thread starter radibob
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aeronca65t
Great Pumpkin
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Be sure the little wire on the unit isn't rubbing against the points cam.
I've had my Pertronix for 6+ years with no trouble.
I still carry the points with me, but so far, no need for them.
I've had my Pertronix for 6+ years with no trouble.
I still carry the points with me, but so far, no need for them.
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I have a Crane ignition, not a Pertronix, so sorry in advance if this doesn't make sense. But I've noticed that it is extremely easy for the wiring in the Crane to restrict vacuum or centrifugal advance, if it's not installed with care. So, if there is such possibility with the Pertronix, it might be worth checking. I can't imagine any type of failure where it would work at idle but not at 2500 rpm.
tony barnhill
Great Pumpkin - R.I.P
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What carb do you have?
tony barnhill
Great Pumpkin - R.I.P
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Well, a Pertronix either works correctly or it doesn't work at all...so, I'd look someplace else.
Trevor Jessie
Yoda
Offline
Can you describe the miss? Does it occur while accelerating, or at cruise?
Have you used a timing light to see how steady your timing is?
Have you checked plug color?
Run the car in the dark and open the hood to see if there is any arcing?
Run it without the vacuum advance?
Have you used a timing light to see how steady your timing is?
Have you checked plug color?
Run the car in the dark and open the hood to see if there is any arcing?
Run it without the vacuum advance?
Trevor Jessie
Yoda
Offline
Oh... and how much timing do you have at 1000 rpm?
Thanks for all the input. The miss occurs when I rev the engine up with the car stationary, crackling and popping start right at 2500 and gets worse to 3000.
At speed you feel it at the same RPM but a little less since i think the car's momentum mitigates it somewhat.
I checked the rockers last night and they are all at spec.
What I am wondering is whether the valves may be floating a bit. This is a head that was rebuilt with new guides and valves and rockers etc. so I wonder if its a bit stiff. I only have maybe 100 miles on it since the rebuild. What makes me wonder this is that once when the engine got hot (like 190) in traffic it seemed to reduce the mis fire a bit.
Maybe I'll dose it wiith some Marvel Mystery oil.
At speed you feel it at the same RPM but a little less since i think the car's momentum mitigates it somewhat.
I checked the rockers last night and they are all at spec.
What I am wondering is whether the valves may be floating a bit. This is a head that was rebuilt with new guides and valves and rockers etc. so I wonder if its a bit stiff. I only have maybe 100 miles on it since the rebuild. What makes me wonder this is that once when the engine got hot (like 190) in traffic it seemed to reduce the mis fire a bit.
Maybe I'll dose it wiith some Marvel Mystery oil.
