Hmmm Spark Knock

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Nov 6, 2008 | 09:51 PM

Jrp1978

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Hmmm Spark Knock

For some reason ? ( just my luck ) i am sure! I am getting spark knock in 4th gear when i first hit the gas its doesnt show up , but I can here it! I am running alittle black smoke out the back !
Just thought a gentlemen on here told me to run .027 gap on my plugs bad idea!!!!!!!!!???????
I have not done it yet but just wanted to get more input 402 ms4 camshaft 11.6 compression . I think ( someone else might check math )
4.00 bore 4.125 stroke .. 64 cc heads flat tops with 2 cc reliefes

Nov 7, 2008 | 05:18 PM

DaveX

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Sounds like the tune might need a little tweaking.

Nov 7, 2008 | 05:20 PM

Jrp1978

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so could the tune cause this ? i mean it must be rich with the black smoke pouring out!

Nov 8, 2008 | 06:11 PM

DaveX

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Yes. If it's actually pinging and it's not lean then it might just need a little less timing in that area.

Nov 8, 2008 | 07:24 PM

Goldfinger911

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.027" plug gap? Unless your boosted, there is not reason to shrink the plug gap that much. You need a wideband and then need to log some data to see whats going on and where in the tune.