Suggestions on a spark plug gap ???
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Joined: Mar 2003
Posts: 691
From: Miami, FL
Suggestions on a spark plug gap ???
i know the stock gap is supposed to be .035, but i wanted to know if i can go higher with the few ignition mods i've done. i put a new accel cap and rotor, accel 8 mm spark plugs, and a 53,000v hypertech coil... what would be a good gap to put my plugs at to get the most power out of my setup? thanks guys
Last edited by dj haf; Oct 24, 2003 at 01:46 AM.
Thread Starter
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Joined: Mar 2003
Posts: 691
From: Miami, FL
would .050 be too much? and how much power do you think i'd get from .045 or .050? i was thinking probably 3-5 hp, and good spark at the end of rpm range... but im no einstein... thats why i came here for advice 
lol
lol
Last edited by dj haf; Oct 24, 2003 at 01:46 AM.
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From: Phila., PA
.045 is what I always set mine at if using a factory HEI type ignition on a N/A motor. The gap will open up slightly as the plugs get some miles on them and the center electrode wears down.
.065 was used in some GM motors but that was typically low compression smogger motors that didn't build much cylinder pressure or turn a lot of RPMs. And even then they were more prone to "eating" coils from time to time.
.065 was used in some GM motors but that was typically low compression smogger motors that didn't build much cylinder pressure or turn a lot of RPMs. And even then they were more prone to "eating" coils from time to time.
Registered User
Joined: Dec 1969
Posts: 1,147
From: Phila., PA
.045 is what I always set mine at if using a factory HEI type ignition on a N/A motor. The gap will open up slightly as the plugs get some miles on them and the center electrode wears down.
.065 was used in some GM motors but that was typically low compression smogger motors that didn't build much cylinder pressure or turn a lot of RPMs. And even then they were more prone to "eating" coils from time to time.
.065 was used in some GM motors but that was typically low compression smogger motors that didn't build much cylinder pressure or turn a lot of RPMs. And even then they were more prone to "eating" coils from time to time.
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From: So.Cal on the Best coast
.45 is factory and with your coil you could go as far as .50 ,but would have to recap more often. If you are running a multi spark unit (ie. MSD,Jacobs,etc.) then you could go .60 -.65 and be good.
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Originally posted by IROC-T
.45 is factory and with your coil you could go as far as .50 ,but would have to recap more often. If you are running a multi spark unit (ie. MSD,Jacobs,etc.) then you could go .60 -.65 and be good.
.45 is factory and with your coil you could go as far as .50 ,but would have to recap more often. If you are running a multi spark unit (ie. MSD,Jacobs,etc.) then you could go .60 -.65 and be good.
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From: T-town
My plugs are easy. I can change them in half an hour with nothing but a spark plug socket and a 5/8" wrench. Then again, I have headers and no smog equipment.....
Anyway, back to the point....I gap mine at .050 with an Accel Supercoil (coil-in-cap HEI setup,) Accel 8mm wires, Accel module, and Accel cap and rotor. I've been running it that way for a year or so with no problems (other than one fried GP Sorensen POS module....but hey I've fried a few of them on bone stock engines.)
Anyway, back to the point....I gap mine at .050 with an Accel Supercoil (coil-in-cap HEI setup,) Accel 8mm wires, Accel module, and Accel cap and rotor. I've been running it that way for a year or so with no problems (other than one fried GP Sorensen POS module....but hey I've fried a few of them on bone stock engines.)
Last edited by TheGreatJ; Oct 25, 2003 at 02:46 PM.
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