Quote:
Originally Posted by kris-kincaid
I see the gauge on the intake breather port. What's the purpose of that? Check crankcase pressure on the dyno? What numbers do you expect to see?
I'm just curious, never seen this before. Seems like a good idea for many reasons. Thanks
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Kinda...
Not checking crankcase pressure, but crankcase vacuum. The dry sump pump pulls vacuum on the crankcase and we have to make sure it doesn't pull too much.
I have DLC coated tool steel wrist pins and coated bearings, but higher crankcase vacuum can actually do damage if it's not curbed. I try to limit it to about 12" of vacuum. This one pulled 15" out of the box because the engine is sealed up well and I had to regulate it.