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Oil Blow Problem
I have a summit 302 in my cobra I just got a week ago. I replaced the intake gaskets as there was a oil leak out the rear of the intake, and replaced the oil in it with Mobil One 10W-30. Now it appears I get oil blowing out of the valve cover breathers on the top of the valve covers.
The engine runs about 60-75 PSI oil pressure which seems like a lot to me. Any Idea's on this problem? Put in 5 quarts which is running high on the dipstick but I do not think it is the original dipstick as it has a cobra emblem on it as well. Thanks Kirk |
I'm guessing the valve covers do not have a baffle. With engine off, pull breathers out. Look down hole with a light. If you can see the rocker arms, the baffles are missing.
Oil pressure is not the problem. Oil is splashing out. |
You are correct Olddog the valve covers do not have the baffles in them, They are a cobra valve cover knockoff but I am not sure how to fix it? Is it something that can be made and inseted from above or what?
Also why did it not do it with the previous oil???? http://www.realtree.com/img/614/medium/breather.jpg |
Is your oil pan a dual sump pan????Did you drain all the oil out of it???Did you get aprox 5 or 6 qts??? You may have too much oil in the engine
Secondly---if you don't have 3-400 miles minimun on it , your rings probably aren't broken in/sealed yet and its too early for Mobil One |
Jerry
The engine has 1300 miles on it and no it is not a dual sump as it gave up about 5 quarts. Do you think it is still too early for the mobil one? I did find some baffles at Summit racing I could use though. Summit Racing SUM-440332 - Summit Racing® Valve Cover Baffle Kits - Overview - SummitRacing.com What do you think of these? Thx |
Get some fuel cell foam, make a piece that will compress and fit inside the fill tube. As it expands within the tube it will stay inside the tube and prevent oil mist from being expelled. I have done this myself for years, it works good.
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Rick Nice idea I like it,
Thanks:) |
If you don't mind doing a little work yourself and have the ability, you can fabricate a set of baffles yourself using the guide on my build page. I had the same problem when using a set of FE pentroof covers on my 351W equipped with the adapter kit I manufacture. I used aluminum roofing flashing. These baffles have worked perfectly for 6 years now without any problems or blow-by. Take a peek at the link below. It just might solve your problem.
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Ok on the same subject but...... The mechanic said he put 5 quarts in but, the paerwork I have with the engine build says it is a new racing style pan. Now remember the oil dipstick shows high. Could it be that this engine and filter only take 4 quarts of oil and it is that simple?
Sorry guys but I am learnig engines again as we go. 1970's were a long time ago for this ol brain!:CRY: |
Do you have a PCV ? and if so where is it plumbed to??
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No it does not.
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These breathers have worked well on several of our engines.
Moroso 68800 - Moroso Weld-In Filtered Breather Kits - Overview - SummitRacing.com |
Without a properly setuo ventilation system you will have blow by, and leaks--
You should have a pcv valve plumbed into one of you valve covers and plumbed to intake manifold vacume--The other side cover should have a filtered breather |
Well guys I have removed the plugged oil filler cap one the right valve cover and replaced it with a filtered breather. I have removed the for racing vent from the left side valve cover and installed a PCV valve tubed back to the intake manifold port that was capped.
Now time will tell if it works as I clean up my engine for the last time (hopefully) Many thanks for all of the hints and suggestions, all were appreciated. Kirk:3DSMILE: |
I've always wondered about the PCV valve question. Is it better to run without one considering you are feeding oil fumes back into the combustion chamber? Aren't large breathers with a puke tank and filter better? I realize the emission benefit of a PCV valve, but you don't see one on a racecar.
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I see no reason not to burn the blow by / oil mist. It lubes the top end and valve guides and keeps things tidy.
When I was younger, I built a mopar 318 with shaved 360 heads (to get the compression up with flat top pistons). I installed the PCV valve on one valve cover, and tapped the top of the Edelbrock manifold with 3/8" NPT and installed a nipple that lead to the air cleaner. I also made a baffle over the hole. There was a super fine oil film on the inside of the cleaner, but not enough to smoke or use oil and it didn't make a wet spot on the filter like a stock breather. Worked like a champ. |
Kirk:
I have had a similar problem recently with my Unique 351W. It appeared to have just about 3/8in above the stick MAX FILL point. That could equate to 1/2 quart. As it is a small block with a cooler-it may have increased sensitivity without baffles or a proper breathing system. I have a breather cap on the left cover only. This subject treatment has really opened my eyes to details. Small oil amount had migrated to my headers and I could smell it and see light smoke coming out of the top hood vent. Since the SS oil line couplings and lower valve cover fasteners are in the same area-it is time to round up all the usual suspects. Not good-and time to fix it-or store a second fire extinguisher. Breather.baffle system inspection and oil level adjustment time. Thanks for input from all sources. Ridge Marriott MACV-SOG (71-72) |
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