spark plug, need part# for colder plug

[Rich]

I'm running NGK BCR8ES plugs, but I would like to go one step colder because I'm suffering from some spark-knock/pre-ignition and want to try to see if I can cure it with a colder plug.
However, the BCR9ES does not exist, the '8' is the coldest for that plug-type. I like that type of plug because it is a copper one (strong) and the nose doesn't stick out.

In the past I have ran the Denso Iridium Power IK22's, but I have bad experience with these; electrode breaking off and pieces of the ceramic nose breaking off and damaging the head. So I'm not going to run those again.

For information, I have a 1.5JZ, a SP67 @ 1.3bar/19psi and running it at the tracks, so plug faul-up for daily driving is not an issue.
Oil-, water- and air inlet cooling is all aftermarket upgraded and track-proof.

So does anyone know of a plug which is colder than the BCR8ES, is a copper plug and does not have the nose sticking out?

thx
Richard

 

[91 mK3]

i dont know if its colder but i run the ngk6097 and they workm fune. myne is gapped at
.27

 

[honestabe]

I too run the 6097's. NGK's BKR7E is the part number (although I think they changed it recently, can't remember what to). It's a copper plug and the 1J loves it. There are a few members on here running that plug with a 1.5J with 500+ HP. At higher boost levels they use a smaller gap.

 

[aphxero]

I run the bkr7e on 1.5j with 1.4bar and .026 gap with no trouble. I've also run them on customers up to 700whp and/or 30psi boost so far.

they are good plugs. They are only a 7 heat range but it's totally fine. Btw, the new part number is 4644

 

[honestabe]

Thank you bro. The 4644's are also cheap too ($2 or less each)

 

[OneJArpus]

i use the same plugs at .026 but at idle i get a sputter/misfire at idle only. Annoying. When in boost it feels great tho

 

[Rich]

Thanks for the replies guys, much appreciated. I'll lower the gaps first to see if that improves things. Thinking about purchasing a spark amplifier as well.

btw, meanwhile continued searching and found the ngk 2669 (BKR9EIX) I read they use them in high powered supra's (2jz) with succes.

 

[supra1008]

I know you can also use the ngk3330's which is also a colder plug. There is a thread on here about it. I also know of a bosch that you can use. I was talking to Sean Casidy at english town. He gave me the box for one of his spark plugs. It's somewhere in my car. I have to clean my car out. lol I'll try to find it.

 

[Rich]

I know you can also use the ngk3330's which is also a colder plug. There is a thread on here about it. I also know of a bosch that you can use. I was talking to Sean Casidy at english town. He gave me the box for one of his spark plugs. It's somewhere in my car. I have to clean my car out. lol I'll try to find it.

actually, the ngk 3330, which is the BCPR7ES is one step warmer from the plugs I use now (BCR8ES)

the number in the ngk part# tells you the heat range; the higher the colder

 

[T701jz]

Hks dli

 

[Supra-Man18]

Dont the 4644's get fouled out quickly tho... or need replacement over a short period of time ?

 

[Turbo Drifter]

I run my 4644's at .032 gap at 20psi with no misses or problems with them fouling out quickly. Thats on my 2jz though but should not make a difference.

I have seen many 700+ whp Supra running this plug with out issues.

Jeremy