So, I've been noticing some oil spots on my fender wells after I've done some engine tuning with some wide open throttle shots. I'm convinced that oil mist is blowing out of the breathers at high RPM. I don't have the stock valve cover arrangement with a tube going to the air cleaner assembly. I have individual breathers in both valve covers.It appears that installing a crankcase evac kit is the way to go; but I have a full exhaust system. Many of the threads I've seen say they work but with open pipes only because the mufflers will produce positive pressure in the system. I don't think this is an issue for my system but am concerned if there are any safety concerns with using an evac kit with mufflers. Could this load my mufflers up with hot oil an eventually ignite? Is anyone running an evac kit with a full exhaust system?I will soon be installing a set of hooker super comp headers, and connecting them up to the 3" X pipe, 3" goerlich hollow turbo case mufflers and 3"flowmaster tail pipes. Thanks for any insight into this!
Here's what I did on all our 455 bracket cars. I used the evac kit type breathers. Then just ran a section of rubber hose from the breathers into puke cans on each side. The oil still comes out, but does not blow all over everything. They make all sorts of fancy catch cans, with drain petcocks. But I just used metal cans, with small tops, which were a close fit for the hose used. I remember specifically using some either 24 or 32oz 104 Octane Boost cans. We used a lot of it back in the old days. I think it replaced the lead that had been taken out of pump gas. It worked great. I never had to buy any racing gas. http://www.summitracing.com/parts/mor-68781http://www.ebay.com/itm/Chrome-Steel-Valve-Cover-1-Breather-Kit-With-Grommets-Hot-Rod-Rat-Rod-V8-/400707322092?pt=Motors_Car_Truck_Parts_Accessories&hash=item5d4c0480ec&vxp=mtrhttp://www.ebay.com/itm/VMS-RACING-BAFFLED-OIL-RESERVOIR-CATCH-CAN-TANK-GUNMETAL-/251524783945
Hello;Why don't you at least simply put a pcv valve in there like there is SUPPOSED to be?Also do a compression test or cyl leak down test like Wayne suggested.Unless you have a dragster engine, it sounds like you might have a problem.If your engine is spewing lots of oil, and you put an evac kit on it that spits it out your tail pipes onto my show car when I was driving behind you, I can assure you, I would be less than pleased. Please keep your oil to yourself.This has been a public service announcement.
Thanks for the ideas guys. The engine does have a PCV system but it could stand to be changed. I'll do a leakdown and see what that shows. I think this might be normal in the high RPM range to some extent as my factory 69 GTO 400 had a hard tube that went from the right valve cover into the air cleaner assembly to help keep the crank case negative, it had this in addition to a PCV system.Assuming this investigative work reveals all things in order the question still remains, can you safely use an evac kit with a full high flowing exhaust or is the big concern that it wont work? I can make it work as I have cut outs. There is an incentive to draw a slight negative in the crankcase as opposed to just venting the oil; to help with ring seal and decrease pumping loses. some indicate 10-20hp gains. The other option is a vacuum pump but that is way more $$$$$$ and overkill for this application.
I think this might be normal in the high RPM range to some extent as my factory 69 GTO 400 had a hard tube that went from the right valve cover into the air cleaner assembly to help keep the crank case negative, it had this in addition to a PCV system."yes, so just buy the right style oil cap or valve cover fitting for a rubber hose and an aftermarket fitting to install on your air cleaner from the local auto parts store and wa la, you're done.it's easy.your pcv might also be too small and flow too little.
Before opting for an evac kit, I might experiment with different PCV valves. Look inside the hole or nipple for a stamped letter indicating spring tension. Different valves open at different vacuum levels and if I recall coreectly, the higher the letter, the stronger the spring. I could have that backwards.
Yes they will work, but get ready for some smoky passes when the oil hits the exhaust.The mains (no pun intended)problem or root cause of this if I remember correctly was the high volume oil pump that Pontiac used. The pump could load up the top ofthe head with oil in no time and when coupled with the crankcase pressure "Thar She Blows". The fix back then was to go with a weaker spring on the pump relief.You still had plenty of oil just not all of it.I still use the PCV and the valve cover to breather tube on the Grand Am.
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