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Old 06-14-2019, 01:46 PM   #1
darendt
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Air from Dipstick

Should air be coming out of crank case while running if dipstick is removed?
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Old 06-14-2019, 04:49 PM   #2
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Quote:
Originally Posted by darendt View Post
Should air be coming out of crank case while running if dipstick is removed?
Yes. It will actually be an air out/in effect following what the pistons direction is.
Ron
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Old 06-15-2019, 08:04 PM   #3
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The Compressor Effect

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Originally Posted by rbabos View Post
Yes. It will actually be an air out/in effect following what the pistons direction is.
Ron
Correct. If you lightly put your hand, finger or maybe a piece of paper or paper towel over the hole you should see and/or feel a light blowing and suction effect. This effect is more pronounced and noticeable on v-twin motors, the bigger the motor, the more noticeable the effect. Crankcase breathing and oil scavenging being managed correctly is very important especially at high RPM's.
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Old 06-16-2019, 06:42 PM   #4
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The last time I left my dip stick out after changing my oil it spit about a quart of oil out the dip stick hole in a couple of seconds after starting the bike and before I could shut it down.
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Old 06-17-2019, 01:47 PM   #5
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The last time I left my dip stick out after changing my oil it spit about a quart of oil out the dip stick hole in a couple of seconds after starting the bike and before I could shut it down.
Yeah, thats why I was asking. I started the bike without the dipstick and my pipe was showered.
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Old 06-17-2019, 07:27 PM   #6
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Lots of fun cleaning up afterwards HEH?
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