ok...I start from the begining. Fresh 355. from the start it was blowing oil out of the timing cover onto the front of the intake and puddeling on the top exterior of the intake. at the time i only had i breather in one valve cover and a oil cap in the other. i then removed the oil cap and installed another breather, but the blowing oil concern kept happening. i had run the car pretty hard and found that the rear main seal was leaking alot. with the engine running and rear main leaking (dripping) i pulled out the engine dipstick, and both breathers off and the leak stops like i turned off a switch. i then added a vented breather catch can on the fire wall, removed the baffles in the valve covers and added a pcv valve. this solved the concern of blowing oil from the front of the engine, but now when i run the car hard, it blows heavy (looks like a fog machine!!!!!) white/blue smoke from the exhaust and still pushes the dip stick out of the tube. the engine only has 1000-1500 miles on it. what else could be the problem???? just as a note- the engine does have high oil pressure. 60-70 psi cold idle, 20-40 hot idle, 60 psi at 2000 rpm cruise hot, pegs the gauge at 100 psi 3500-4000 and above!!!
Excessive Crank Case Pressure
- Thread starter 85streetss
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Your rings may not be seated, Who did the hone job was it done right? Blowing the distick and oil out is usually crank case pressure caused by compression going by rings into crank case. Running motor hard without breaking it in right will cause a ring washout situation in which rings will almost never seat. I would baffle the hole where your pcv valve is it might be sucking the oil strait out and burning it, hole should be baffled. Try that first and go from there.
Your oil pressure why being a little high doesnt concern me i have the same pressures on my fresh motor when first built they it lightened up to about 75 psi on the high side.
Your oil pressure why being a little high doesnt concern me i have the same pressures on my fresh motor when first built they it lightened up to about 75 psi on the high side.
dude get a crank case ivac kit till the rings sit reely good thats what i did with my fresh 383 it takes like 200 miles for the rings to sit (set :?: )
I removed the valve cover baffels because they were so tight that it took 30 min to fill the engine with 5 qts of oil. The valve cover grommets (tried several types) when inserted into the valve cover, touched the baffels and were completely blocking everything off.
When the breather catch can was plumbed into both valve covers with 5/8" hose, at operating temp., the blow by comming out of the breather catch can filter looked like a fog machine!
As far as break in, i broke in the cam as comp recommended. I didn't really start running the car hard until a few weeks ago, and running it hard consist of shifting at only 5000-5500 rpm's and a engine that was designed to pull till 6500 and redline at 7000 rpm.
The engine has been blowing oil from break in until now. this has always been an issue. Even just noraml "street" driving it would puddle on top of the intake after only 2 days of driving.
When the breather catch can was plumbed into both valve covers with 5/8" hose, at operating temp., the blow by comming out of the breather catch can filter looked like a fog machine!
As far as break in, i broke in the cam as comp recommended. I didn't really start running the car hard until a few weeks ago, and running it hard consist of shifting at only 5000-5500 rpm's and a engine that was designed to pull till 6500 and redline at 7000 rpm.
The engine has been blowing oil from break in until now. this has always been an issue. Even just noraml "street" driving it would puddle on top of the intake after only 2 days of driving.
Do a compression test. You may just find one cylinder down alot compared to the others. The last time I had this problem, i thought I had a broken ring, but it was actually the ring land. About a 2inch long chunk was missing from between the top and second rings. Hope you have better luck than me.
the compcams procedure covers the cam, but the rings can take a couple of thousand miles to seat. and they require the CC pressures to be low. at this point there's probably so much carbon on the walls that they can't seat. make sure the PCV is baffled and has good vacuum, make sure the other valve cover is well ventilated. you want fresh air to flow in one side across the engine and out the other. put some ATF in each cylinder and tune the carb slightly lean. then cruise around at part throttle for a few weeks. that should clean the cylinders and get the rings to start seating.
i had similar issues when i dropped in my engine and i had to get a K&N open style breather and a stock PCV valve to get enough flow/suction.
i had similar issues when i dropped in my engine and i had to get a K&N open style breather and a stock PCV valve to get enough flow/suction.
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