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Author Topic: BlowBy  (Read 3252 times)

Offline atavar

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BlowBy
« on: August 17, 2015, 02:50:46 PM »
So, as noted in my oil change from hell thread, when I ran the engine with the dipstick removed (fresh fill to measured capacity) I got enough of a pulsing wind out of the dipstick hole to put a nice oil mist over everything.  Is this normal on these engines with their small crankcase volume or do I have a problem?  It really didn't smell strong like blowby, I am hoping it is just compressor effect from piston displacement..
C'mon, one of you gullible Norge owners go out with a rag and pull the dipstick and start the engine and tell me what happens to you..   :popcorn: 
2008 Norge with about 40Kmiles on the clock.

« Last Edit: August 17, 2015, 02:51:50 PM by atavar »
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Offline Zoom Zoom

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Re: BlowBy
« Reply #1 on: August 17, 2015, 02:53:54 PM »
No that is normal.

ZZ
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Offline normzone

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Re: BlowBy
« Reply #2 on: August 17, 2015, 02:56:10 PM »
[atavar], check your serial numbers on your engine/frame.

If it ends in either a letter or a numerical designation, there may have been a recall addressing this very issue.

 :wink:
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Offline rocker59

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Re: BlowBy
« Reply #3 on: August 17, 2015, 02:57:19 PM »
Quote from: normzone on August 17, 2015, 02:56:10 PM
[atavar], check your serial numbers on your engine/frame.

If it ends in either a letter or a numerical designation, there may have been a recall addressing this very issue.

 :wink:

LOL!  :cheesy:
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Offline Sasquatch Jim

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Re: BlowBy
« Reply #4 on: August 17, 2015, 03:00:41 PM »
  It's a design feature to waterproof your boots.  On one side only.
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Offline Wayne Orwig

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Re: BlowBy
« Reply #5 on: August 17, 2015, 03:24:57 PM »
It is normal. And no I would never do that.

(Pay no attention to those stains on the wall.......)

I assume it is windage and the simple displacement of the pistons, and less about blowby.
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Re: BlowBy
« Reply #6 on: August 17, 2015, 04:40:34 PM »
Shared crank pin 90*-V twin.

Crankcase volume varies by about 2/3rds of swept volume between its maximum, when the crankpin is at 12 O'clock and its minimum when the crankpin is at 6 O'clock. Hence the pumping action. On something like a straight four or other multis with crank pins at 180* crankcase volume remains almost constant. On a boxer twin it varies by the full swept volume every revolution.

Pete
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Offline normzone

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Re: BlowBy
« Reply #7 on: August 17, 2015, 04:50:22 PM »
Gawd, it's sexy when you talk like that. Do you have a CD for sale or something ? I know some women that would respond very positively.
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Offline kevdog3019

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Re: BlowBy
« Reply #8 on: August 17, 2015, 06:41:02 PM »
Quote from: normzone on August 17, 2015, 04:50:22 PM
Gawd, it's sexy when you talk like that. Do you have a CD for sale or something ? I know some women that would respond very positively.

I think you simply have a problem of displacement!   :boozing:

Hey babe, lets go to the bedroom works for me, but she understands displacement and no explanation required.  Oh... I'm also not married.  :cool:  :grin:
« Last Edit: August 17, 2015, 06:44:09 PM by kevdog3019 »
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