Posting this here because more of you use special plugs than the normal 3rd gen people do.

I previously ran B9EGV with good results. Smooth idle and no misfires under boost. This weekend, I installed the new iridium BR9EIX plugs. Still good under boost but the idle is erratic with more misfires. A Crane HI-6R fires my stock coils. Even on multi spark they are rougher than the EGVs.

Any one else running this on a mild ported engine?

 

where do you get them from. i still have a set of million dollar plugs but am scared to put them in cause i dont want to foul them.

 

I got them from

http://www.monarchproductsinc.com

I just swapped and tested them again, same results, worst idle with the iridium.

Both sets were tested with gaps at .020" and .025". That extra 4K internal resistance is too much for even my Crane HI-6R on single or multispark. Even though the center electode is a smaller diameter they have a thicker ground electrode and this along with the colder spark must be quenching the initail flame more than the EGVs.

Called NGK and talked to them, no plans to make it in non resistor. I plan to give them away to a friend for his testing. What a $30+ waste from NGK! They are the worst idling plugs I ever had in my RX-7.

Run OK under boost though. But if the idle spark is weaker, than the high end spark will also be weaker.
E=IR never changes.

 

thats strange I run the br10eix ngk plugs with no idle issues or any other problems. i was running the b10egv's with good results as well. the eix plugs seemed to make the car run smoother but that could have been in part to the older plugs being worn out. running stock igintion on a large ported single turbo motor .25 gap on the plugs. i think i paid something like $4 for each at my local orilleys.

guess i will have to get a new set of both and see how they fair.

James

 

Hmm I'm running BUR9EQP leading and BR10EIX trailing (gapped at 0.022) and they seem to do just fine... I'm on the stock coils/ignitor with an HKS Twinpower ignition booster. Maybe I wouldn't be so happy with them in the leading positions? I dunno....

Brian

 

I know its an old thread but isn't it the opposite? BR10EIX leading and BUR9EQP trailing.

 

Update that has been posted other places long ago but since this thread was resurrected. When I tried a .030 gap with them, they idled OK, I have now switched over to them because they do not ware out as fast and work great with the larger gap.

 

Nope... 9s in the leading (bottom) and 10s in the trailing (tops).

 

why would you put the 10's up top
i would rather have those down bottom where the more heat is

i find the 9's all round are fine for me 12-15psi
just useing the stock ign system

 

Note that all the stock plug configurations use a colder (higher number) plug in the trailing versus the leading (e.g. 7L/T9). Apparently there is more heat in the trailing position than the leading, or something like that.

-Max

 

Ahhh...I've been using 9's for such a long time I forgot. ;-) But you figure since the leading plugs do most of the work they would be a colder plug. But I guess if indeed there is more heat in the trailing portion that would make sense to use a colder plug. I'm running single turbo setup with TII coil and Jacobs rotary ignition pack. I'm running strickly with boost controller off, wastegate gate pressure only(10#) until tuning takes place. I'm gonna go ahead and try switching all 4 over to the B10-EGV with a gap of .024 and see how that works out. What gap is every one else using with the B10s? Thanks..!!