A buddys 440 blows oil out the dip stick when he hard accellerates

[ottawamerc]

Hi guys
Well for a change its not my car that needs help My buddys car (a 68 R/T) blow oil out his dipstick when he puts his foot into it and sprays oil all over? His 440 is customized a bit by it has 2 4BBL's and a custom air cleaner. The PCV valve is going into the passenger valve cover and he has just installed a filtered breather into the drivers valve cover. Now the oil is showing around that breather too? The engine doesnt seem to have too agressive of a cam and runs well. Any ideas whats causing this

Scott

[Challenger340]

Excessive Blowby ?
If the PCV is working properly ?.... make sure it's sucking at high speed cruise.
Crankcase pressure is about all I can think of that would "Blow" the dipstick out ?

[firefighter3931]

  excessive crankcase pressure is about the only thing that will push a dipstick out.


Ron

[ottawamerc]

So you think his rings are done? I guess he needs to do a compression and leak down test.

Scott

[firefighter3931]

Scott,

Compression test is a good place to start....do a dry test first followed by a wet test to compare numbers.  

Does the engine blow any smoke out the tailpipes ?


Ron

[ottawamerc]

Nope no oil out of the pipes.

[Highbanked Hauler]

 do the simple stuff first ,pull the pvc valve out .. I had a 318 in a van that the PVC valve was clean but the hose was plugged  where it was going into the carb.

[Kern Dog]

When the piston rings are worn, the following happens:
Combustion pressure from the burning of fuel and air pushes the piston down. Worn rings allow some of the cylinder pressure to slip past the rings down the cylinder and into the "crankcase". The PCV is supposed to pull pressure from the crankcase but if the pressure is too much, the pressure finds another exit. It will either push oil past the oil fill cap, past a poor sealing oil pan gasket or seal, OR push the dipstick out.

[heyoldguy]

Was this engine recently rebuilt? And.......whenever it was built, what endgaps were used on the compression rings?