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Normal or excessive blowby from dipstick?
Posted: Tue Jul 15, 2025 4:05 pm
by kridlokk
Hello guys.
I'm just wondering if this much blowby from dipstick is normal or exessive for these engines?
https://youtube.com/shorts/D9lH0he5X3s? ... EiGdcdNTl7
Re: Normal or excessive blowby from dipstick?
Posted: Tue Jul 15, 2025 4:24 pm
by Kurt in S.A.
I've never done that, but that's a massive hole in the system with the dipstick removed. Air is going to find the easiest way out. Your best test is to do an actual compression test or leak down test.
Kurt
Re: Normal or excessive blowby from dipstick?
Posted: Tue Jul 15, 2025 7:05 pm
by Tom H Ca
In some manual, it says to not run the engine with the dip stick out. I read that after I did it.
Tom
Re: Normal or excessive blowby from dipstick?
Posted: Wed Jul 16, 2025 4:42 am
by barryh
It's normal. A boxer engine has a huge amount of crankcase compression as both piston come to BDC together. On the rare occasion I've forgotten to screw in the dipstick, the noise it makes on start up wouldn't let you ride off in that state.
Re: Normal or excessive blowby from dipstick?
Posted: Wed Jul 16, 2025 11:14 am
by dwerbil
barryh wrote: ↑Wed Jul 16, 2025 4:42 am
It's normal. A boxer engine has a huge amount of crankcase compression as both piston come to BDC together. On the rare occasion I've forgotten to screw in the dipstick, the noise it makes on start up wouldn't let you ride off in that state.
Did that once on the /7. Do it once and one will never do it again!
Re: Normal or excessive blowby from dipstick?
Posted: Thu Jul 17, 2025 5:33 am
by Rob Frankham
barryh wrote: ↑Wed Jul 16, 2025 4:42 am
It's normal. A boxer engine has a huge amount of crankcase compression as both piston come to BDC together. On the rare occasion I've forgotten to screw in the dipstick, the noise it makes on start up wouldn't let you ride off in that state.
The oil running down your right leg might be a bit of a clue as well
Rob