spark plug gap

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spark plug gap

Post  BBFmustang on August 5th 2010, 9:04 pm

i assume rule of thumb is 35 what is the gain of going to a bigger gap ? trying to learn a little tuning when using nos

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Re: spark plug gap

Post  69F100 on August 6th 2010, 9:48 pm

Jimmy you back in town for a while on the gap thing I don't know on the nos but I know when I put the msd 6al in mine I went to 45 and it seams to run cleaner not as rich when idling.

Jim

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Re: spark plug gap

Post  whatbumper on August 7th 2010, 1:18 am

the more cylinder pressure the less gap you will need to run.

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Re: spark plug gap

Post  BBFmustang on August 7th 2010, 5:39 am

[quote="69F100"]Jimmy you back in town for a while on the gap thing I don't know on the nos but I know when I put the msd 6al in mine I went to 45 and it seams to run cleaner not as rich when idling.

Jim had enough of the traveling going to mdi they seem to be the most stable around .all the o/t you can stand

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Re: spark plug gap

Post  BBFmustang on August 7th 2010, 5:49 am

whatbumper wrote:the more cylinder pressure the less gap you will need to run.
I am runnjng a 200 shot so stay with the 35 gap ?i have a msd system 6al , digital retard

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Re: spark plug gap

Post  nuclearcobra on August 7th 2010, 9:51 am

25 or 30 for a 200 shot imo

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Re: spark plug gap

Post  feetfirst on August 7th 2010, 2:29 pm

Interesting topic........

6Al box.......0.035, popped and banged under load. Went to 0.030, then to 0.025, alot better but it still wouldn't rpm under load.

Finally went to a Digital 7 box, and now am back to 0.035...............and 6 tenths faster... Rolling Eyes

Its all about cylinder pressures, and the correct amount of spark needed.

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Re: spark plug gap

Post  whatbumper on August 7th 2010, 2:56 pm

the msd 6's are pretty weak ignitions. as cylinder pressure increase they can't "light the fire" so to say. We ran a 28 gap with a digital 7 with a 200 shot for years without issue. some people go wider but if it works well we didn't change it. It's time for you to step up ignitions. You will be glad. I will be selling my MSD 7530 at the end of the season. We are stepping up to the MSD 8.

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Re: spark plug gap

Post  Barney on August 7th 2010, 4:12 pm

I run a .028 with a 110 squared and a mallory hyfire 7IIc box.

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Re: spark plug gap

Post  BBFmustang on August 7th 2010, 6:45 pm

thanks guys ,Will experiment with smaller gap, I have had no problems out of my 6al but always needing to improve . Been looking at the digital 7

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Re: spark plug gap

Post  whatbumper on August 7th 2010, 8:50 pm

BBFmustang wrote:thanks guys ,Will experiment with smaller gap, I have had no problems out of my 6al but always needing to improve . Been looking at the digital 7
You just think you've had no problems with the 6. Wait until you put a 7 on it and see the difference. Very Happy

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