Understood ;
You said it idles smoothly @ 900RPM's so I was expecting at least 15" HG @ idle, a big overlapping cam isn't goilg to idle smoothly @ 900RPM .
? Do they make electric high volume vacuum pumps ? . I know they have engine powered ones for Diesel engines......
-Nate
Quote:
Originally Posted by Chris_oz
I consider good vacuum anything in double numbers, this engine had 11 to 12 in Hg at idle, which is enough for brakes to work and not give drive ability issues.
Big duration and long overlap cams will kill the vacuum and other methods of boosting the brakes may be required.
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