Plug gap - tr55s & msd
10-21-2012, 01:08 AM
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Plug gap - tr55s & msd Seeing a bunch of wierd **** around with guys saying they gap .30, .35? Saying the tighter the gap the stronger the spark... Isnt that completely wrong lol? Id say more like the tighter the gap the more consistent the spark... Bigger gap = more powerful burn as long as you can reach it right?
So stock is .50.. Ive got a full bolt on 97z28 with a MSD blaster coil, new GM opti, MSD 8.5mm wires, NGK tr55 plugs. I was thinking .55 for a little better performance all around with the more powerful coil, but could somebody set me straight on this? Just want the best overall performance, reliability, power, no missing, ya know.
So stock is .50.. Ive got a full bolt on 97z28 with a MSD blaster coil, new GM opti, MSD 8.5mm wires, NGK tr55 plugs. I was thinking .55 for a little better performance all around with the more powerful coil, but could somebody set me straight on this? Just want the best overall performance, reliability, power, no missing, ya know.
10-21-2012, 02:06 AM
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For sure, im just trying to figure out why people are saying .35?
What about my 383 car.. I went stock gap, should it be diff? Forged le2 head 383 NA cc306 nothing fancy
What about my 383 car.. I went stock gap, should it be diff? Forged le2 head 383 NA cc306 nothing fancy
10-21-2012, 07:26 AM
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I agree with lt1slow..
For your 383, if it's something like a 12:1 CR motor, I'd gap at .040" as a starting point. If you have the desire and time to experiment, gap extra sets of plugs at .050" and at .060", take them to the track, watch your mph and listen for breakup on dragstrip passes to know when you've gone too far, then pick the midpoint, erring on the tight side. Keep in mind, that as they age, they won't tolerate as wide a gap.
I run a bone stock ignition, with .040" gap, 12:1 CR.
For your 383, if it's something like a 12:1 CR motor, I'd gap at .040" as a starting point. If you have the desire and time to experiment, gap extra sets of plugs at .050" and at .060", take them to the track, watch your mph and listen for breakup on dragstrip passes to know when you've gone too far, then pick the midpoint, erring on the tight side. Keep in mind, that as they age, they won't tolerate as wide a gap.
I run a bone stock ignition, with .040" gap, 12:1 CR.
10-21-2012, 08:06 AM
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You are doing exactly what I would do. You mentioned modifying the gap and checking the results at the track. Another excellent idea.
My mention of the differences in ignition was to give someone an idea where and why you would want to start on the tight end or the wide end.
