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Plugs and gap?

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Old 08-21-2008, 12:00 PM
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Default Plugs and gap?

Curious about what you guys would recommend... my car seems pretty sensitive right now at higher rpm and load, kinda running rough. Of fuel/air/spark, I strongly suspect spark might be the culprit. The 2 bar SD tune was running just fine a few months ago.

T67 at 11 psi
forged 346, AFR 225's 72cc
224/224/114, 0.588
compression ~ 9.2:1 or so

What plug and gap would be optimal? Anything new on the market in the last few years that delivers better spark for FI?

Thanks in advance for any help...
Old 08-21-2008, 01:54 PM
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copper only. Gap on your set up could be pretty high probably. I d bet 030-035 would be ok.

I ussually run autolite 103's @ 025 to 028 gap. I ve run them up to 20 psi on 346's to 370's.
Old 08-21-2008, 04:36 PM
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I'm thinking of sticking with the NGK TR6 plugs, but gapping them as you suggest between 0.025 and 0.028. I think the present plugs were gapped at closer to 0.035.




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