Mike Puckett
SCCoA Member
I decided to put the MP2 blower I've acquired on my SC and compare it to my current S-model blower. The swap over seemed normal enough but when I started it up it didn't want to idle, I only had 10" of vacuum, and my a/f meter read super lean except when I drove it around. It acted just like when I cracked my IC. Spraying brake cleaner at all the connections showed nothing. I pulled the blower back off and while checking it over noticed that the gap where the intake bolts to the back of the blower seemed to be a bit wide. I took an .25mm feeler gauge and slid it right thru the connection. No wonder it's running lean, it's got a terrible leak right there. The gap was so wide 518 anerobic sealer wouldn't even set up and harden. It turned out that both the back of the MP2 and the MP intake manifold weren't flat but bowed slightly. I used a big wide flat file and flattened the intake manifold surface and then taped off the inlet on the MP2 to keep the metal filings out and flattened it as well. Then I used some silicone between the surfaces to seal them. Now I wonder if my S-model is flat. There was a little puddle of oil under it when I first pulled it off. Anyway, the car's back to running normal again but I never thought to look there for a vacuum leak. It felt kind of strange but I can stick my hand all the way thru the intake manifold and touch the back of rotors.