spark plugs for 12A race engine?
 

12a bridgeport running 500 cfm 4 barrel......what pluggs to fun and what temp rating,part # please,also running msd 6a on lead and stock trail set up.

203 people have see my post for help in picking a spark plug.......but no one has a answer or even a sugestion?????? i really like this site....but sometimes its hard to get any help.......

If you were running a streetported 13B making 350-450whp under 20psi, you would have 10+ replies already considering that's what 95% of us on this forum have in our cars. You're going to have to be patient :)

yea....just figurs some one would have known what plug to use cause they may have run one before. its cutting out above 4,500 or so and driving me crazy....cant seem to chase it down an plugs are very pricy,so wanna get it right

With my track only 12A Bridgeport, Weber 48, Electromotive ignition I run the NGK R6725-11.5 plug. This is the plug of choice for the majority of the NA Mazda SCCA rotary racing community.

wow...lookd em up and thoes plugs are crazzy $$$.

I guess this means 'thank you' :rofl:

hahahahaaa....yes thanks! but hopfully someone will list a more aforable plug i can use....im not even sure there the problem anyway,may be the dist for all i know.

You're welcome. Unfortunately, nothing related to a race motor is cheap...

I run 7420's in my street car. Race or street, I think the ROTARY in general is not cheap when pushed far beyond original power levels.

try this

https://www.rx7club.com/single-turbo...-11-a-1079578/