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| Observations about AF ratio and temperature. https://slantsix.org/forum/viewtopic.php?t=55665 |
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| Author: | mpgFanatic [ Sun Jul 06, 2014 9:02 am ] |
| Post subject: | balancing compression, neat! |
Quote: I based the lash setting on compression tests to even out all cylinders’ pressures. In other words I was able to mess with lash to bring all six cylinders with in five psi or less of each other, where before with lash all set the same for intake and exhaust respectively resulted in up to 20 psi difference between high and low readings.
Fascinating. My initial reaction was to wonder if setting it up at cranking speed would correlate to dynamic compression running speed... but that sort of fine-tuning certainly can't hurt. Especially with a lumpy cam like you describe.With a stock cam, I have attempted a similar goal by using slightly increased (an extra .005" or so) spark plug gaps on cylinders where compression numbers were a tiny bit lower (10 psi or so.) Unfortunately, I never had any diagnostic equipment capable of telling me whether it worked any better-- it just sort of seemed like a good idea-- and when I got lazy and stopped doing it, I couldn't tell that the engine ran any less smoothly. Maybe 0.005 wasn't enough. Has anyone ever tried this, with stronger conclusions than mine? - Erik |
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