[Axlehead]

I replaced my stock coil with the MSD coil and I was wondering if I should run a larger gap than the stock .54 since the MSD apparently has more voltage. I have heard a lot of discussion about different gaps and I was wondering if there is any benefits or even negatives to running a larger gap. Thanks.

 

[Axlehead]

thoughts anyone? I am just wondering if there is a benefit to running a larger gap. stock is .54 so how would .60 be?

 

[MadMikeyL]

A larger gap will do better at igniting the air/fuel mixture, provided you have enough voltage to get a good spark jumping across it. However if the mixture is igniting right now, then you won't gain anything by just running a larger gap. A leaner mixture makes it harder to fire the plug, and higher compression ratio will make it harder as well. If the engine is still mostly stock (stock heads, bottom end, compression ratio) then I would say leave the gap at .54. Just changing the gap without changing anything else will not help you any, and it could easily make the car run like crap. A tune to lean out the mixture a little bit combined with a larger plug gap and the higher voltage coil could improve your gas mileage a little bit, but you have to be careful cause as the mixture leans out, it gets hotter inside the engine, and you could cause severe engine damage. Also doing this might cause NOx emissions to go up.

 

[Axlehead]

thanks I guess I will stick with the stock gapping.