.035 it is!!
Thanks Guys!!
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| Plug Gap https://mail.slantsix.org/forum/viewtopic.php?t=62452 |
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| Author: | Rick Covalt [ Thu Jun 07, 2018 4:16 pm ] |
| Post subject: | Plug Gap |
What plug gaps are you guys running in your race cars? I have 11.5 CR (#185 cranking pressure) with the HEI ignition, MSD E-coil and I am going to put in new plugs. Curerently they are at .040 |
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| Author: | DusterIdiot [ Thu Jun 07, 2018 5:07 pm ] |
| Post subject: | D |
D |
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| Author: | slantzilla [ Thu Jun 07, 2018 10:23 pm ] |
| Post subject: | Re: Plug Gap |
.030-.035". |
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| Author: | Dart270 [ Fri Jun 08, 2018 2:52 am ] |
| Post subject: | Re: Plug Gap |
Wow, that is a low cranking psi for 11.5:1. Must be a big cam or not so early centerline. I would go for 0.035" or a skosh more. I've been gapping Project V (11:1) at 0.038. Lou |
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| Author: | Rick Covalt [ Fri Jun 08, 2018 3:09 am ] |
| Post subject: | Re: Plug Gap |
Quote: Must be a big cam or not so early centerline.
.566 / 257@ .050/ 102 intake centerline, installed at 99So I was thinking a bigger plug gap would be better for performance, but I likely need a little less than my current .040? That is what I will do, but can you help me understand why? Thanks! |
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| Author: | Dart270 [ Fri Jun 08, 2018 5:00 am ] |
| Post subject: | Re: Plug Gap |
0.040 should be fine, really. If it gets too big, then the spark is not fat enough to fire the mix properly. Higher energy ignitions/coils will allow larger plug gap. In my experience, gap makes no difference in power (ETs...) at least from 0.030" to 0.050", which I've tried on ~250 HP Slants. So, you may as well run no-so-large gaps. Higher comp and more HP mean more fuel in the cylinder and it is harder to ignite. Smaller gaps can ensure everything is igniting. I run 0.030-0.033" on the turbo motor, just for insurance, somewhere around 0.038" on NA. Depends on my mood. This is my understanding and experience.... Lou |
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| Author: | slantzilla [ Fri Jun 08, 2018 10:42 am ] |
| Post subject: | Re: Plug Gap |
As Lou said, wider gaps make no more power, but do make it easier to put a plug out and foul it. When I was spraying I closed them up to .025" just to make sure they would fire, and that was with an MSD. |
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| Author: | Rick Covalt [ Fri Jun 08, 2018 1:15 pm ] |
| Post subject: | Re: Plug Gap |
.035 it is!! Thanks Guys!! |
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