Originally Posted by shbox
You could test the seal of the opti by using a vacuum tester.
I did my Mighty Vac hooked up to draw side of Opti with other line pluged...it 'slowly" bleeds off to 0. It holds 4" while engine running but won't go higher. The 2 valve line leading to the Opti builds and holds solid at 18"
My old opti would not even let vacumn build up.
should the Opti be 100% sealed?
Since the engine vacumn system is tied into opti I would think it should hold vacumn otherwise a "leak" in the system would effect motor.
I am chasing a stumble under load problem and while this opti not holding vacumn issue may not be related...I want to know if it should be 100% sealed.
would have to pull it and rtv or dialectic grease on inner seal.
I would think the rear bearing on Opti would prevent 100% seal ability...it has to spin???