i know the BCP7E are projected insulator type and the BKR7E are projected tip (ISO) (according to NGK) but i have no idea what that means. i know they both have a heat range rating of 7. my setup is a mild NA motor but i thought i might get a quick response on the FI forum so what are the differences?

 

All I know is that I use BCPR7ES-11 on my turbo setup, and thats what is reccomended for turbo cars... Theyve worked great for a few years so Im stickin with them. I cant answer your question though, but Im sure someone on here can

 

yah alot of people who run boost run the BCP7E's while NA guys run BKR7E's, theyre the same heat range but maybe theres something im missing.

 

BCR and BKR is very different.. it is different length of plug and types of plugs

BCR is JIC style 35mm
BKR is ISO style, 30.5mm

if your car is ment to have JIC and put BKR then.. it can creat gas between spark plug contact to top of plug. which can often occur misfire.

more info read on NGK site

 

does anybody knows who makes any #8 plugs?...