plug gap for blower
Thread Starter
Drifting
Joined: Dec 1999
Posts: 1,330
Likes: 36
From: Waynesboro, PA
Co-winner 2020 C4 of the Year - Modified
plug gap for blower
I don't know what just happened to my post, but it is listed and I can't see any post there. Oh well. Here is what I have....
383 LT1
LT4 heads and intake
Vortech S-trim
Delteq opti-direct ignition
NGK TR6 plugs
What should I gap the plugs at? I know .050" is factory, but should they be gapped smaller for the blower?
383 LT1
LT4 heads and intake
Vortech S-trim
Delteq opti-direct ignition
NGK TR6 plugs
What should I gap the plugs at? I know .050" is factory, but should they be gapped smaller for the blower?
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by POLOVETTE 94
I don't know what just happened to my post, but it is listed and I can't see any post there. Oh well. Here is what I have....
383 LT1
LT4 heads and intake
Vortech S-trim
Delteq opti-direct ignition
NGK TR6 plugs
What should I gap the plugs at? I know .050" is factory, but should they be gapped smaller for the blower?
383 LT1
LT4 heads and intake
Vortech S-trim
Delteq opti-direct ignition
NGK TR6 plugs
What should I gap the plugs at? I know .050" is factory, but should they be gapped smaller for the blower?
Melting Slicks
Joined: Dec 2000
Posts: 2,719
Likes: 59
From: Fremont Oh
I'm running .035, but agree with TJ I probably wouldn't go more than .045.
If it weren't such a pain to change the pluges I'd say if you have everything pretty much dialed in try a few passes with a change of say .05 starting at say .035 and see where the car likes it the best.
Another thing is also the heat range on your plugs, I just recently changed to chanpions. But when I was running TR-6's I was running .035 as well we have 91 octane here in california and I have 100+ degree summers.
Hope that helps!
Mo
If it weren't such a pain to change the pluges I'd say if you have everything pretty much dialed in try a few passes with a change of say .05 starting at say .035 and see where the car likes it the best.
Another thing is also the heat range on your plugs, I just recently changed to chanpions. But when I was running TR-6's I was running .035 as well we have 91 octane here in california and I have 100+ degree summers.
Hope that helps!
Mo
Pro
Joined: Aug 2004
Posts: 544
Likes: 0
I run Autolite 104's gapped at .040. You could probably go to .045, but changing plugs is a major !@#$!%, so I'd play it safe.
Originally Posted by POLOVETTE 94
Well, if those are the only 2 votes, I guess I'll start with .040" 
Safety Car
Joined: Apr 2001
Posts: 3,525
Likes: 2
From: Houston TX
I used to run AC Delco FR3LS6 at 0.042", but with the AFR heads, I now run the Champion Racing at 0.038". It also is dependent upon what level of ignition you are running. Mine are each MSD6AL or 7 series.
Hope this helps.
Aaron
Hope this helps.
Aaron
Safety Car
Joined: Apr 2004
Posts: 4,532
Likes: 7
From: Lahaina Hi
I use ngk bp8efs plugs with the recessed electrode depending on your boost 35 is what I run .The thing to worry about is if you are blowing out the spark that is why you gap them down and use msd or a device to increase spark. Blow out the spark fire and engine ping.
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Melting Slicks
Joined: Oct 2003
Posts: 2,951
Likes: 3
From: Mount Vernon OH
Gap
It really depends on the output of your ignition, the amount of boost you are running and the amount of total ignition timing. 32-35 is pretty normal unless you are really hitting the engine with super high boost levels and then 28-30 is not unusual.
