Boosted +20psi Plug Gap?
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Joined: Nov 2002
Posts: 2,776
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From: Santa Monica, CA
Car: '91 Camaro RS
Engine: F1R Procharged 383
Transmission: Tremec 600
Axle/Gears: moser 12 bolt, 4.11's 33 spline axl
Boosted +20psi Plug Gap?
Hey all! It's been a while since I messed with the plug gaps, but it's time for new plugs and just curious what kind of gaps bigger boost guys are running these days on DISTRIBUTOR ignition systems (Yeah, still have a prehistoric SBC!)
Mine are at .026 now, using an Autolite 3922 plug (AFR heads). They seem to be ok, but I'm considering closing them up a little.
Mine are at .026 now, using an Autolite 3922 plug (AFR heads). They seem to be ok, but I'm considering closing them up a little.
Joined: Sep 2003
Posts: 25,895
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From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: Boosted +20psi Plug Gap?
I’ve run tighter on other stuff. .022-ish but depends on ultimate cylinder pressure. Good engine combo with big turbo on 20 is alot more than something mild on small turbo on 20 for a given cubes
Thread Starter
Supreme Member
Joined: Nov 2002
Posts: 2,776
Likes: 8
From: Santa Monica, CA
Car: '91 Camaro RS
Engine: F1R Procharged 383
Transmission: Tremec 600
Axle/Gears: moser 12 bolt, 4.11's 33 spline axl
Re: Boosted +20psi Plug Gap?
It's 8.5:1 on a 383, and it's got a pretty big cam for a street car (262/272 @.050). I kind of want to convert it to coil-on-plug anyway, but I'll just get into a ship of theseus problem where I should've just done an LS and been done with it haha.
Might take 'em down to .022 and see how it goes!
Might take 'em down to .022 and see how it goes!
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From: 212 is up in this Bit@#
Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: Boosted +20psi Plug Gap?
What kinda Spark Energy are we talking here...
HEI? CDI? 7AL? Hotter...?
HEI? CDI? 7AL? Hotter...?
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