Id like a proper definative answer to this as theres so much confusion over it. Im running stock boost and syock ecu but full freefliw intake and exhaust, ive had an issue with the plugs beening blown out on wot in 2nd gear runs. Turns out I had na plugs gapped to 1.1mm ive fitted the right plugs now gapped at 0.8m which is a smaller gap than stock, is this right? Could it cause problems?

The spark plug number PFR6B11C the 11 part stands for 1.1mm gap.

 

Jeff TT

 

 

Edited February 11, 201312 yr by JeffTT

The definitive answer is the biggest gap possible without the spark plug being blown out. On a standard car with standard plugs, you just use the specified gap, which would be 1.1mm straight out the box.

 

Running a 0.8mm gap shouldn't cause you any issues. How does the car drive? Is the misfire gone? Are you only getting stock boost with the intake & exhaust upgrades?

Cheers jeff. Noz yes stock 9psi I want to get a few 1000 miles on the stock setup to bed in the tubs and throughly test its correct before stressing it. I havent had chance to test drive since sat with all the wet weather :(

Is it correct that too smaller gap can create dett? Or have I misread that? Cheers guys.

Cheers jeff. Noz yes stock 9psi I want to get a few 1000 miles on the stock setup to bed in the tubs and throughly test its correct before stressing it. I havent had chance to test drive since sat with all the wet weather :(

Is it correct that too smaller gap can create dett? Or have I misread that? Cheers guys.

 

Turbos don't need to be run in, there are no contacting metal parts.

 

Too small a gap doesn't cause det, the only thing with regards to a spark plug that can cause knock is if you're running too hot a grade.

Right well im hoping that these 11c plug will help as the previous were simply 11's do you see thatvas a likely cause orginally?

It wouldn't have been the fact that they were PFR6B-11, it would have been because they were old if they were the cause of the misfire.

 

I run NGK BCR8ES with a 0.9mm gap which are much shorter than the OEM plug at 1.4 bar and have never had the spark blown out. In fact, the only cars I've ever had where that has been a problem was a Sapphire Cosworth on BCR8ES and my S13.

Right well im hoping that these 11c plug will help as the previous were simply 11's do you see thatvas a likely cause orginally?

 

If they wern't B (US) or C (UK) specs, you had N/A plugs mate

smithy

Yeah thats right smithy plain 11s na plugs, I assume they were fitted asthere half the price.

tested today big smiles.

tested today big smiles.

 

:thumbup: sounds good.