How much vacuum should I feel?

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Dec 17, 2020 | 11:05 AM

ElkCon

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From: Florida

How much vacuum should I feel?

Hi all.
I was replacing the TPS and while test running with the air cleaner off, I noticed the breather hose was pulling vacuum...(hose that comes off the top of the RH valve cover)
Should that be doing that?

Dec 18, 2020 | 11:04 AM

alloro

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Yes the PVC system is pulling vacuum through the crankcase and the breather is where the air goes into the crankcase. It should only be around 3-5 in. of vacuum, not 20 like at the intake.

Dec 18, 2020 | 02:55 PM

ElkCon

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Joined: Jul 2019

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From: Florida

Quote:

Originally Posted by alloro

Yes the PVC system is pulling vacuum through the crankcase and the breather is where the air goes into the crankcase. It should only be around 3-5 in. of vacuum, not 20 like at the intake.

Ok it must be OK -- that is about what it feels like.

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