Technical > Spud Miller's Cave

VP M-5 use

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masracingtd1167:
I have used it and picked up about .06 . I richened mine 10 percent and it was too much .It really smells bad !

alkyal:
Tried it out last Sat. Richened it 6% Believe the engine was lean with the original jet as the 6% still showed slight lean. With the jet change, the engine really picked up. Turned 300 more RPMs with the same gear. Bottom line-It was fast for 7 laps-Then pushed out the head gasket. Believe the problem may be too much C/R [over 14.25 to 1] 38-39 degrees timing, but most of all NOT enough Cam Duration. Will rethink the cam before next time out. Also had Ratio rockers [Stock 1 to 1 These were 1.3 to 1 ratio] Not much block or head damage done. It did let out a shower of Sparks. A little show for the Peanut Gallery!  Thanks for All your info and input. Al

Curly1:

--- Quote from: alkyal on March 06, 2016, 07:13:56 PM ---Tried it out last Sat. Richened it 6% Believe the engine was lean with the original jet as the 6% still showed slight lean. With the jet change, the engine really picked up. Turned 300 more RPMs with the same gear. Bottom line-It was fast for 7 laps-Then pushed out the head gasket. Believe the problem may be too much C/R [over 14.25 to 1] 38-39 degrees timing, but most of all NOT enough Cam Duration. Will rethink the cam before next time out. Also had Ratio rockers [Stock 1 to 1 These were 1.3 to 1 ratio] Not much block or head damage done. It did let out a shower of Sparks. A little show for the Peanut Gallery!  Thanks for All your info and input. Al

--- End quote ---

I think you need to put it on the dyno. You may find out you are running way too much timing. I started out running 38* and even tried 41* but when I put it on the dyno we learned it did not need that much timing and now run 28*! Yes 28* and it is easier on motor and runs better. My compression is 14.5 with Enderle injection and AFR 235 heads. Much safer to tune on dyno and you can get the fuel mixture perfect in just a few pulls.

Also on the head gaskets I lost a head gasket a few years ago and found some of the head bolts were not as tight as they should have been. I now believe in re torqueing the heads after a few heat cycles and have not had a problem since.

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