I'm running a stock TT conversion at 6 psi on NGK coppers BCP7ES, so they are the correct heat range. What gap are you guys running? I'm running the gap specified in the manual : .040. I'm getting a lot of knock under boost and suspect that this may be due to my spark plug gap as some helpful people have pointed out in another thread.
I run .028 gap with NGK's one step colder. I get spark blow out badly at anything above .032. With a smaller gap your idle won't be quite as perfect as stock gap, but it should drive and boost fine.
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3000 Hybrid is right. I run .030 so yea somewhere between 0.028 and .032 and you should be fine. Also how are your SMIC's doing? If they are getting heat soaked then that could also be contributing to the knock. I am going FMIC cuz I am tired of dealing with heatsoak, boost leaks and all that rubber tubing lol.
3000 Hybrid is right. I run .030 so yea somewhere between 0.028 and .032 and you should be fine. Also how are your SMIC's doing? If they are getting heat soaked then that could also be contributing to the knock. I am going FMIC cuz I am tired of dealing with heatsoak, boost leaks and all that rubber tubing lol.
I am running the stock FMICs but I don't think heat soak is the problem since the knock occurs even when the motor is cold (albeit even more when it is warm).
I don't know - .030 seems pretty small for a stock conversion on 6 psi. I was considering trying .035ish which is a little smaller than the minimum suggestion in the shop manual.
NGK's at .028. I had Iridiums at .031 and that worked, but I had tried .035 previously and got blowout at high boost. gotta tell yeah, first time it happened, scared the bejesus outta me....
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i run my plugs gapped at .030, any larger and at 15+ psi blowout occurs. this is with 13t's. currently coppers, once i get done tuning i'll be changing to the ngk irridium ix's and the gap will stay the same, .030.
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Tyla, on 6psi I'd say shoot for .035. If you still get blowout, regap it down to .032 and try again. On 6psi, I run one step colder NGKs at .040 without blow out.
Tyla, on 6psi I'd say shoot for .035. If you still get blowout, regap it down to .032 and try again. On 6psi, I run one step colder NGKs at .040 without blow out.
Old thread my friend. I put the link in someone’s thread that wanted help with gap and someone posted in it.
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Help me with spark plug gap
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