General Category > Quadrajet Carb Talk and Tips

vacuumlevel with Crower 60240

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Marx3:
sorry, just saw your post's...
I like having vacuum advance for a mild engine in a stock driver.
I remember you said it would make about 12" in idle when you suggested it to me Cliff. That's why I was surprised to see it actually making up to 20" at 800 rpm and on stock 18 degrees initial plus vacuum...
I upped compression to about 8.5 on this particular 400 and the carb is calibrated per your advice ofcourse.

what is MVA short for? I don't get it...

77cruiser:
Manifold vacuum advance

Marx3:
ohhh ofcourse :-)

I get the picture now... I never tried ported vacuum. I just didn´t think it could be the issue with an engine that made so much vacuum in idle.
I'll look into it!

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