Oil blowout from breather – 509 w/ 8-71 Blower

JohanSweden · 2025-06-02 08:58:08

https://cimg1.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/1740x2000/michigan_poker_run_008b_42352c5f8cf81431e5d4892f3c32b3d959ab1946.jpg The hair and cell phone! Love it

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06-04-2025 | 12:39 PM

#21

hogie roll

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From: St. Pete Beach, FL

Quote:

Originally Posted by Mbam

The hair and cell phone! Love it

06-04-2025 | 01:50 PM

#22

JohanSweden

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From: Sweden

Quote:

Originally Posted by PROP STAR

Do a leakdown and compression test , hopefully Midwest Engine Tech in Mokena didn't build your motor and set ring gaps at .0040

This engine is built in Sweden by the first owner here.

06-05-2025 | 11:19 AM

#23

William Diggens

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Quote:

Originally Posted by JohanSweden

Thank you for your advice.

I spoke with a friend who has installed evac systems on several engines, including marine applications.

With this setup, negative pressure is created in the crankcase.

As shown in the attached picture, the hoses are routed to the exhaust and fitted with check valves.

Yes, I don’t think I’ll have space for a vacuum pump. But the evac system I mentioned earlier – could it work in a similar way?

yes,this the system i used. Eliminated oil misting issues.

06-08-2025 | 03:57 PM

#24

JohanSweden

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From: Sweden

Quote:

Originally Posted by underpsi68

https://www.gzmotorsports.com/VP104-vacuum-pump.html

do you know any good vacuum pump kit for my application? For blower engine.

06-08-2025 | 03:58 PM

#25

JohanSweden

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From: Sweden

Quote:

Originally Posted by ICDEDPPL

That`s over kill and unecessary, usually there`s no room with a sea pump anyway .
No reason to reinvent the wheel.

talked to a friend who knows guys building engines for street race and drag racing. He said it will only be good with a vacuum pump for my application. The evac for exhaust would be too small

06-09-2025 | 09:51 AM

#26

ICDEDPPL

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From: Chicago

Quote:

Originally Posted by JohanSweden

talked to a friend who knows guys building engines for street race and drag racing

Well, if your friend talked to a friend who knows guys building engines for cars, then I`d definitely take their advice over the guys who actually know boats.
Good luck!

06-09-2025 | 10:56 AM

#27

JohanSweden

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From: Sweden

Quote:

Originally Posted by ICDEDPPL

Well, if your friend talked to a friend who knows guys building engines for cars, then I`d definitely take their advice over the guys who actually know boats.
Good luck!

Just trying to fiend the best solution for my engine. Maybe it’s unnecessary and just need evac kit for exhaust. It’s that what you saying?

06-09-2025 | 05:13 PM

#28

ICDEDPPL

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From: Chicago

I`m saying get a Catch can and move on with your life.
If that`s not good enought you have other problems.
Why overcomplicate things?

06-10-2025 | 06:37 AM

#29

JohanSweden

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From: Sweden

Quote:

Originally Posted by ICDEDPPL

I`m saying get a Catch can and move on with your life.
If that`s not good enought you have other problems.
Why overcomplicate things?

The info I got is that even with just a catch tank, crankcase pressure remains — which is almost impossible to eliminate with a blower engine. A vacuum pump, however, solves the problem by effectively removing the pressure from the crankcase, that’s what I’ve been told.

But sure, if you say a catch tank alone is enough, who am I to argue.