With my 1330cc what’s a suggested plug gap when running a Pertronix Flame Thrower Coil and Pertronix module? Currently running NGK BP5EY with .030’ gap. Should I open it up to .035’? Or leave things be? All running fine otherwise.

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http://www.youtube.com/user/Hanras

Hi, I do not believe you should open it up. That does not have a big spark output, and you risk misfiring as every single gap in the system uses some spark , leaving little for firing the hard to burn ULP
cheers Lindsay Siebler

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1967 EX works rally mini restoration virtually complete OBL45F
1965 Mk1 Cooper S
1970 Colt 1100F SS
2014 Mitsubishi Imiev fully electric daily driver
1948 Allard M coupe Olds 215 v8 project
1971 Twin cam Escort ex Uk championship winning rally car project

Stronger spark with less area versus weaker spark with bigger area .As long as the spark causes combustion then which is best .Any engineers here?

If you go too far, you will get a low speed misfire during warmup when cold.
I used to run .035" with a Bosch GT40 and a Pertronix ignitor, but it would misfire at .040".
I agree with lomin, .030" is best.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

No worries. Left at .030. Cheers.

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http://www.youtube.com/user/Hanras