Colder heat range plugs for supercharger?

[russ_]

I've read several places that one heat range colder spark plugs are recommended for the supercharged motors. Can anyone give me the correct part number for these? Is it a good idea even without other fuel/ignition upgrades?

Thanks for the info.

 

[that$pit]

Dunno, I do know I did mine a couple of weeks ago, and the guys at the dealership still recomended the stock ones, they couldn't pull anything else up though, don't think you'll hurt anything

 

[bikerjosh]

Denso IK22 Iridium Spark Plugs



Are what I've been using in mine.

 

[catalina34]

I've read several places that one heat range colder spark plugs are recommended for the supercharged motors. Can anyone give me the correct part number for these? Is it a good idea even without other fuel/ignition upgrades?

Thanks for the info.

BKR5E are the stock NGK's. One step colder would be BKR6E. Two steps colder is BKR7E and so on.

For your reading pleasure from NGK (http://www.ngk.com/charglossary.asp?kw=Heat+range):

"An unaltered engine will run within the optimum operating range straight from the manufacturer, but if you make modifications such as a turbo, supercharger, increase compression, timing changes, use of alternate racing fuels, or sustained use of nitrous oxide, these can alter the plug tip temperature and may necessitate a colder plug. A rule of thumb is, one heat range colder per modification or one heat range colder for every 75–100hp you increase."

and

" For NGK, the higher the number, the colder the plug. "

 

[A.Wilson013]

I also run the IK22's.

 

[russ_]

Thanks for the info guys. It's tune up time and I figured I might as well do it right.

Edit: Found them at NAPA for $7.74 each under the part # DEN 5310.

 

[catalina34]

Thanks for the info guys. It's tune up time and I figured I might as well do it right.

Edit: Found them at NAPA for $7.74 each under the part # DEN 5310.

It looks like those are two steps colder than stock according to this cross reference:

DENSO SPARK PLUGS

I always thought the IK22 were one step colder. Interesting.