Mike hoppe

Last weekend at Buttonwillow had a lot of oil spray out of the dipstick tube at high rpm. The car has a catch can. Has anyone experienced this under same conditions? If so have you found a remedy for it? Has anyone tried the GZ vacuum pump? If so, did it work?

Dirty Howie

Mike

You should add some info like engine type, mods and where your catch can is hooked up.

Have you crimped the dipstick tube yet ?? Blocked the valve cover vent and used the top of the oil fill cap yet ??

Maybe someone will let you know how to check for blow by which can pop the dipstick


DH

redtopz

I was there, but not sure if I met you. I have a procharged GTO with around 760 rwhp that had this problem, but I only drag race with it. I would not want this issue on a road course. Depending on how bad your blowby is, there are different solutions. After running breathers and making a mess all over my engine compartment, I installed a GZ vacuum pump and it works great. However, like I said I've only run it at the dragstrip so I don't know if they are designed for prolonged high rpm track days. Might want to call the owner to see what he says and if he's sold any to other roadcourse guys.

Whatever you do, you must relieve the crankcase pressure. If you just crimp your dipstick you are likely to blow your rear main seal. First thing I would do is check to make sure your engine is OK. Do a leak down and compression test. Sometimes bad blowby is a sign of a broken ringland or piston (ask me how I know ). If that turns out OK, then another thing you can do (besides a vacuum pump) is remove your valve covers and weld on some large -12 AN male fittings and then run -12 braided tubing to 2 large catch cans with breathers. I'm not an expert, but this is what I have seen and done myself. Good luck,

Bill.

VGLNTE1

I deal with this all the time. I have a LS3 416 and its crank case pressure is unreal. After pumping out over a quart last week from the tube and covering the car with oil, I decided to run a huge breather oil cap. I had a breather catch can and it still did this. I bet I have tried 20 different variations of a PCV system..here is what I have now and seems to work...

The drivers side valve cover is vented to the passengers valve cover back port. The front port on the passenger is capped. The oil fil is a breather. I run the valley cover to a breather catch can as well. The intake is capped off as well.

ssdeuce

Do you have any pics of your setup?

redtopz

That's what I was doing before I went with the vacuum pump. Got tired of all the oil spewing out of the breather and all over the engine compartment. One thing you can do to minimize this is to make a custom baffle that goes inside the oil fill tube under the breather.

Aardwolf

On my car last season I had that issue. I did a compression test and several where low with one at 70#! After pulling it apart the rings were all broken.

C5ZEE06

+1..

Mike hoppe

No pic's. Redtopz, how is the vac working?

VGLNTE1

I sure dont. Im only home on weekends to see the car...i will try and snap some this Sat...