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Re: is my manifold vacuum low??? (archive)
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Posted by Todd Kenyon on December 01, 2001 at 11:34:35:

In Reply to: is my manifold vacuum low??? posted by Todd Kenyon on December 01, 2001 at 08:03:14:

Well I may have anwered my own question... saw way below in first discussion of throttle balancing that Ian got something like 80kPa which is 9 in Hg. Also saw from throttle balancing instructions that in their example the average for each throttle was like 9 inHg (300 mBar). So as someone explained on the E28 board, this engine doesn't pull as much vacuum because of the cam overlap. Sound right??


Put a vacuum gauge on a "T" fitting between manifold and fuel press reg (so pressure reg still hooked up to vacuum line)/ Get a reading at warm idle of 6-10 inHg, which afaik is quite low??? expecting 15-22? needle fluctuates with idle speed +- 2-3 inHG. So maybe I have a vacuum leak somewhere? getting a check valve later so I can check each cylinder. Any comments appreciated! (note - compression good at 190 on all cylinders, valves just adjusted 2 days ago).




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