setting plug gap on cut back ground electrodes
Thread Starter
Safety Car
Joined: Jan 2001
Posts: 3,637
Likes: 27
From: Norwalk Ct
setting plug gap on cut back ground electrodes
I have a set of Autolite AR 3910's, the ones with the cut back ground electrode, how are you setting the plug gap on these?
Say your setting it to .040", are you measuring the distance between the edge of the ground electorde to the edge of the center electrode ?
cheers
Nick
Say your setting it to .040", are you measuring the distance between the edge of the ground electorde to the edge of the center electrode ?
cheers
Nick
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
Hi Nick,
electricity like to go the easy way- set the gap at the closest point, be it the side or the end of the electrode.
Just for info, I used a couple of sets of the Autolite AR plugs. Made the car hard to start, (very easy to flood it), and didn't last for long. It was running very rough and was missing at idle. New set of AR's fixed it, but wasn't too long before it was at it again. And they were also about 2x more $. I went back to plain old Autolite plugs and no more problems.
I'll admit up front that with the rectangle port heads and the ZL-1 cam and 12.5 compression, there are lots of reasons it gets cranky. But it sure is easier to start with standard full electroe plugs and they DO seem to last longer.
electricity like to go the easy way- set the gap at the closest point, be it the side or the end of the electrode.
Just for info, I used a couple of sets of the Autolite AR plugs. Made the car hard to start, (very easy to flood it), and didn't last for long. It was running very rough and was missing at idle. New set of AR's fixed it, but wasn't too long before it was at it again. And they were also about 2x more $. I went back to plain old Autolite plugs and no more problems.
I'll admit up front that with the rectangle port heads and the ZL-1 cam and 12.5 compression, there are lots of reasons it gets cranky. But it sure is easier to start with standard full electroe plugs and they DO seem to last longer.
Racer
Joined: Jan 2004
Posts: 377
Likes: 1
From: Anchorage Alaska
[QUOTE=gkull; between .040 and .050 is about is low as I would go with aftermarket electronics[/QUOTE]
Like MSD? Their information doesn't give a gap measurement, it just says change it in increments of .005" - .010".
I'm running a blown big block with MSD. Should I start around .050"?
Thank you
Like MSD? Their information doesn't give a gap measurement, it just says change it in increments of .005" - .010".
I'm running a blown big block with MSD. Should I start around .050"?
Thank you
Pro
Joined: Dec 2006
Posts: 665
Likes: 0
From: wilmington nc
I have a set of Autolite AR 3910's, the ones with the cut back ground electrode, how are you setting the plug gap on these?
Say your setting it to .040", are you measuring the distance between the edge of the ground electorde to the edge of the center electrode ?
cheers
Nick
Say your setting it to .040", are you measuring the distance between the edge of the ground electorde to the edge of the center electrode ?
cheers
Nick
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