Quote:
Originally Posted by whunter
I am modeling this, and will test it on an engine shortly.
On a new or low mile vacuum pump attached to a good sealed vacuum system, this sounds correct.
Sadly many systems leak, and the vacuum pump is tired. 
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May I suggest:
1. Start with a brand new vac pump, ideally a piston type.
2. Drill a hole on the casing such that a borescope can be inserted, focusing on the cam and cam follower and shoot a video of the test.
Seeing is believing!
