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View Full Version : spark plug gap?

blackknight
08-19-2009, 12:38 AM
what is your spark plug gap on your 3923's when you run spray
BryanRT360
08-19-2009, 07:53 PM
.035 if your running a stock ignition. .040-.045 if running a hot box

I run the 3923 @ .035 for the 100 shot
3922 @ .035 for the 150
blackknight
08-19-2009, 11:55 PM
i have an MSD box but i usually run them at .035 but i will try it at 40 see if it runs better although it runs good like that with a 150 shot
Five9Dak
08-20-2009, 02:58 AM
Don't be afraid to close them up, on the dyno I've nothing but gains time and time again compared to people who try to skirt the edge and run as much gap as possible on spray. You're not loosing much at all and gaining a lot of confidence by closing them.

(I wrote an ls1 nitrous tune for a car at school, and helped dial in the shot on others. )
grapejuice1998
08-20-2009, 10:07 PM
Don't be afraid to close them up, on the dyno I've nothing but gains time and time again compared to people who try to skirt the edge and run as much gap as possible on spray. You're not loosing much at all and gaining a lot of confidence by closing them.

(I wrote an ls1 nitrous tune for a car at school, and helped dial in the shot on others. )

Right on.
Here's the analogy I have always used with regard to plug gap and nitrous. Think of the spark as a candle in the wind. A short, fat spark, will be much easier to keep lit than a tall skinny one.
blackknight
08-20-2009, 10:31 PM
thanx. i get the candle theory i have always ran them at 35 but thought to get some different opinions or suggestions
grapejuice1998
08-20-2009, 11:25 PM
thanx. i get the candle theory i have always ran them at 35 but thought to get some different opinions or suggestions

.035 isn't a huge gap, you should be OK with that.
2ndGen360dakota
08-26-2009, 07:54 PM
I have a 360 magnum in my 90 dakota RC and I had my plugs gapped at .040 with a 125 shot and 4 degrees of timing pulled out on a msd digital 6 box. I pulled the plugs the other day and I burned a strap off number 1. I tightened the gap to .035 and I am going to pull 6 degrees of timing as soon as the truck is finished at the body shop and I will try it again. It ran 11.501 at 114 on a 125 shot with a 1.56 60' time.