Jacob's recommends 0.065 gap for the plugs on a car with the Pro Street set up.

Has anyone had problems with this wide gap??

Also, do you just run stock plugs (AC Delco).

Thanks.

 

By the way, the car is powered with a supercharger at 10 psi boost.

How will this affect the gap?

Thanks.

 

In the past I used the Champion or Autolite standard cheap as dirt plugs as Jacobs recommended and gapped it per their instructions. No problems. I did see a slight rounding off of the electroce with time. I switched over to BOSCH platinums when I installed my headers. Only because I didn't want to hassle changing plugs with the headers. My situation isn't Supercharged. I recommend contacting Jacobs with your questions.

Lon

 

Actually to help others later, I found this at Jacobs.

What should I gap my spark plugs to with the Jacob's ignition?"

For most street driven applications simply add .015 to the stock plug gap recommendation for normally aspirated engines. We do not recommend running a gap above .070 and generally want to stay on the lower side of .065 in most cases.

Now for turbo / supercharged, or nitrous oxide injected applications, try a step or two colder heat range plug to reduce the chance of detonation, and a gap around .030 to .040 depending on the amount of boost / nitrous being used. The more boost or nitrous used, the lower the gap should be to prevent flame out.