Colder Plugs & Smaller Gaps

[65coupei6]

Just doing some research. I have read you should switch to a colder plug when adding a turbo, nitrous or a supercharger.

Also closing the gap because as the boost increases, smaller plug gaps are required to prevent spark blow-out.

True?

 

[pmuller9]

Just doing some research. I have read you should switch to a colder plug when adding a turbo, nitrous or a supercharger.

Also closing the gap because as the boost increases, smaller plug gaps are required to prevent spark blow-out.

True?

True.
As cylinder pressure increases the resistance between the plug gap increases.

 

[65coupei6]

Ok. Thanks. I am just getting prepared for an upcoming project.

 

[pmuller9]

The smallest gap we ran was .025” with 35 lbs boosted methanol.
What type of project are you looking at?

 

[65coupei6]

Supercharger. Looking at 6-8 of boost. Running with a FiTech. I was thinking .035 gap?

 

[pmuller9]

Which ignition system?

 

[65coupei6]

Duraspark II, MSD6, TFI coil

 

[pmuller9]

.035" plug gap should be good.
You probably already know this, use 40 to 50 ohm/ft spiral core wires.