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Ron Gusack · 04-03-2016, 01:30 PM

I'm using manifold vacuum for pan vacuum and my fresh engine is a little down on pan vacuum compared to last year's engine. Last year the pan vacuum would creep up to a little over 6" and this year I'm at about 4. Seals are not in backwards. Before I put the engine in the car I put a vacuum pump on it and I could hear it leaking at both crank seals. I used a Felpro viton single lip rear main, 2918 I think. It's the same seal I used in the last build. Is there any chance the seal improves with some run time, like it burnishes or smooths on the very edge?

04-03-2016, 01:30 PM	#1
Ron Gusack Member Join Date: Feb 2009 Posts: 244 Likes: 1 Liked 7 Times in 6 Posts	Pan vacuum question I'm using manifold vacuum for pan vacuum and my fresh engine is a little down on pan vacuum compared to last year's engine. Last year the pan vacuum would creep up to a little over 6" and this year I'm at about 4. Seals are not in backwards. Before I put the engine in the car I put a vacuum pump on it and I could hear it leaking at both crank seals. I used a Felpro viton single lip rear main, 2918 I think. It's the same seal I used in the last build. Is there any chance the seal improves with some run time, like it burnishes or smooths on the very edge?