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Author Topic:   oil from breather
cobb
Dirt Maniac

Total posts: 131
posted July 17, 2005 06:06 PM  
i'm getting oil from my valve cover breathers all over my motor and it's driving me nuts. any ideas on how to stop this? the breathers are on the left side already.

sc1 racing
Dirt Freak

Total posts: 419
posted July 17, 2005 06:20 PM  
is the tube loose, how about the restrictors in the bottom..may also be exesive ring wear causing blow by..

dluna
Dirt Freak

Total posts: 334
posted July 18, 2005 07:25 AM  
Try those "Outerwear" covers: http://www.speedwaymotors.com/xq/aspx/display_id.463/qx/Product.htm

Maybe your cylinder walls are getting loose. Is it time for new rings?

NJantz
Dirt Forum Champ
Total posts: 755
posted July 18, 2005 09:02 AM  
Plug the inside of the breather with some foam similar to what is used for fuel cells.

Ziptie some shoprags around the breather.



J3
Dirt Maniac

Total posts: 188
posted July 18, 2005 09:06 AM  
quote:
Originally posted by NJantz:
Plug the inside of the breather with some foam similar to what is used for fuel cells.

Ziptie some shoprags around the breather.


Don't use the foam, will come apart and get down in motor. Use a shop rag or old sock and stuff on the inside of the breather. Restricts the flow some, but still allows it to breathe and will stop the oil prob.

rrrrick
Dirt Maniac

Total posts: 192
posted July 18, 2005 10:36 AM  
I run my breathers on a tube that connects both valve covers. I tried everything to stop oil from coming out of those Left side breathers, rags, more baffles. Now my engines stay nice and dry.

NJantz
Dirt Forum Champ
Total posts: 755
posted July 18, 2005 01:25 PM  
J3 haven't had that happen in 4 years. Possible....maybe. The foam came with the valve covers when they were new. It would be pretty difficult for a piece of foam to make it past the baffles. The foam is still intact.

[This message has been edited by NJantz (edited July 18, 2005).]

racer17j
Dirt Forum Champ
Total posts: 5390
posted July 18, 2005 06:35 PM  
thanks yall. i don't think it's blowby, that motor is still fairly new. i'll try some of those ideas.

sideways
Dirt Forum Champ
Total posts: 715
posted July 18, 2005 08:10 PM  
quote:
Originally posted by cobb:
thanks yall. i don't think it's blowby, that motor is still fairly new. i'll try some of those ideas.
Well it could still be blow by on a new engine til the rings seat.Then it may go away.

ryan
Dirt Forum Champ
Total posts: 776
posted July 18, 2005 09:00 PM  
Do you run cheap claimer rings or good ones.

smyle
Dirt Roller

Total posts: 13
posted July 19, 2005 01:09 PM  
I slip a sock over the outside of my breathers which catches any oil.

sc1 racing
Dirt Freak

Total posts: 419
posted July 19, 2005 04:07 PM  
you also have to be carefull not to increas crank case pressure. if you do you will start blowing out gaskets..

if you run moly rings and do not break motor in correctly you will wear the rings out before they seat. i built a stought 383 for a buddy but he just started it revd it up to listen and shut it off. only time he started it was when someone came over then he just ran it long enough to brag.3 months latter it was race season he ran 10 nights and never could get rid of blowby, so after the 12th night tore it down and looks like piston rings never contacted walls, tore it down honed and installed new bearings, and rings and he is smoking them any track he pulls to..

chickenlittle
Dirt Full Roller

Total posts: 64
posted August 01, 2005 09:07 PM  
You can try a crank case evacuation system. They C&S carbs makes a bolt on pump kit. It basically creates negative pressure in the crank which keeps any oil from blowing out. It has a scavanging system that filters out impurities and catches the oil and puts it back in the sump. Good for about 25HP on a SBC without a good ring seat. Cost is about $400. A cheaper but less effective way is the Moroso kit that uses check valves on the headers to pull a vacum from some oil separators that mount on the valve covers. Drag racers have been using this setup for years. Cost is about $60 from Summit.

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