andy0075 9 1 Cars Posted December 31, 2007 Hello ! Is it necesarry to use other spark plugs in my engine ? Spec : XU9JAZ - now on 45 Weber - head skimmed 0,8mm - 300° cam with 12,5mm lift at TDC,..... First i used the ones which were built in befor i modified the engine : Bosch FR 7 DC+ After 500km the ceramic isolator of the spark plugs began to losen on all 4 plugs. Now i use Bosch Super 4 . Both are for the original XU9JAZ engine without modifications. So, do i need other plugs ? What are you using ? NGK, Bosch,..? !! happy new year !! Andy Share this post Link to post Share on other sites
welshpug 1,621 Posted December 31, 2007 Single electrode plugs seem to work better than others in the 8v head, try a colder plug (i.e a BCP8 instead of BCP7 IIRC) never had any trouble with NGK plugs, though all my engines are very much standard Share this post Link to post Share on other sites
DamirGTI 323 Posted December 31, 2007 Hi ! Another vote for that - try one grade colder plug ... NGK-s are very good quality plugs , im currently using one step colder plug in my modified 1.9 engine and it works just fine no probs what so ever ... Cheers ! Damir Share this post Link to post Share on other sites
andy0075 9 1 Cars Posted January 1, 2008 thanks folks! I try NGK next time. I only have heard good things about them. @Damir : one step colder means : NGK-S........type ? Andy Share this post Link to post Share on other sites
James_R 3 Posted January 1, 2008 I've always found BCP8ES's to be fine or 7's if they prove too cold Share this post Link to post Share on other sites
