spark plug gap

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

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

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

[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

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

25 or 30 for a 200 shot imo

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...

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

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.

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

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

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.