FE Power Forums

FE Power Forums => FE Technical Forum => Topic started by: preaction on September 24, 2019, 01:21:07 PM

Title: Sparkplug gaps
Post by: preaction on September 24, 2019, 01:21:07 PM

While using an MSD box for ignition on a 10.5 comp fairly stout cam engine would .035 gap be a good starting point ?

Title: Re: Sparkplug gaps
Post by: cattleFEeder on September 24, 2019, 01:25:55 PM

My .05 cents is .035 to .040 is a good place to be.

Title: Re: Sparkplug gaps
Post by: Stangman on September 24, 2019, 01:45:20 PM

I agree Im at 40 and its probably a tight 40.

Title: Re: Sparkplug gaps
Post by: plovett on September 24, 2019, 02:07:32 PM

I like 0.035" even with a good MSD ignition.   I have a 10.5:1 engine and have tried wider gaps.  I never found any improvement.  I did think it missed in certain conditions with the wider gaps.  I think I went up to 0.040"-0.045".   I went back to 0.035" and have never had a problem since.

JMO,

paulie

Title: Re: Sparkplug gaps
Post by: GerryP on September 24, 2019, 03:19:12 PM

Quote from: plovett on September 24, 2019, 02:07:32 PM

I like 0.035" even with a good MSD ignition.   I have a 10.5:1 engine and have tried wider gaps.  I never found any improvement.  I did think it missed in certain conditions with the wider gaps.  I think I went up to 0.040"-0.045".   I went back to 0.035" and have never had a problem since.

JMO,

paulie

I had the same experience.  Using a Duraspark and MSD 6AL.  Engine started and ran reliably at .035.  I tried from .055 to .040 and it picked up misfire over .035.  My assumption was that modern inductive systems are running .060 gaps and seem to do fine.  Nope.

Title: Re: Sparkplug gaps
Post by: preaction on September 24, 2019, 09:59:08 PM

Sounds good thanks for the replies. ;)