Can spark plugs cause knock?
#1
Can spark plugs cause knock?
My car hates timing. I cannot run increase timinging to what most people run without inducing knock. AFR is a safe 11.3 on 93 and still it knocks with relatively low timing.
I am using Denso IW24 which are 1 step colder plugs and I am starting to think that I should try regular cooper in the same heat range (BPR8ES). Is it possible that the Denso are more knock prone than others? I can't think of anything else. Car has basic bolt ons and making 350 awhp.
I am using Denso IW24 which are 1 step colder plugs and I am starting to think that I should try regular cooper in the same heat range (BPR8ES). Is it possible that the Denso are more knock prone than others? I can't think of anything else. Car has basic bolt ons and making 350 awhp.
#2
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are you still running a catalytic converter? A 20G at 24 #'s with cat is going to create some backpressure and excess heat in the cylinder during compression/combustion, it's doesn't seem that far off you'd be struggling with knock.
Your sig says you have a TBE, but can't tell if you have a cat or not. There's always water/meth injection.
Your sig says you have a TBE, but can't tell if you have a cat or not. There's always water/meth injection.
#4
No I do not have a cat. I have a WORKS resonated test pipe. The axleback also has a resonator, so no cat but 2 straight thru resonators of 3". No neckdown anywhere on the exhaust. I also have a TItek V2 O2 housing. I was hoping for more timing and a little more power. I will try the BPR8ES but Pep Boys and Advance Auto do not have them in stock.
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#11
The fact that you can gap BPRs so easaly is a big asset too. I used to run BPR7ESs at about a .24 gap. Even then I need the water/meth becuase this was in PHX with wonderful 115 degree ambient air a lot of the time and on 91 octane gas.
Another thing to check is the oil seals around the plugs. Some oil in there will trigger detonation events sometimes.
Back pressure does not sound like the problem in this case.
Another thing to check is the oil seals around the plugs. Some oil in there will trigger detonation events sometimes.
Back pressure does not sound like the problem in this case.
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