I was sifting through an old junk drawer and fount these plugs new in the box. They are trailing plugs. Figured I'd install them just for the heck of it.

I thought 9 might be a little low on the heat range for an NA 12a though so I wanted to ask U all What U reccomend?


Thanks...

 

9's are higher in the heat range...

 

Higher than the stock plug reccomendations? The higher teh number the colder the plug IE a 6 is alot hotter plug than a 9. Or at least that is what I was told? What heat range plug is suppose to be in a stock rx-7?

 

no wrong!!
the higher the # the colder the spark plug is... with NGK plugs that is...
its opposite with denso spark plugs tho..

they will work fine in your car.. unless its really cold where you are.. might be harder to start, thats it...
you can run a little more timing (safely)with colder plugs too

 

thats what Im running, and for the same reason

 

right on!!

87 octane on a n/a works great! cold plugs= cheap insurance against pinging // detanation

 

Sticky!!!!!