cause of blowby?

[rtviper]

Went to the track for the 1st time. After a few passes and some issues with way to rich with the fast system I noticed some blowby out of the breather in passenger side valve cover. Most of the time when I started the car it would blow out some smoke from too rich and some oil smoke. Going down the track on a mid 10 second run their is no smoke at all. After every burnout and when I put the car in gear it would die. On restart a bunch of black and some blue smoke. I just did a compression check and had 161,171,174,175,165,176 in the cylinders on a cold motor. Does this sound like a ring issue. The GN1 heads do not have seals on any of the valves? Thanks

 

[GNguy]

your turbo is probably going out.

 

[2QUIK6]

Maybe a stuck PCV or not sealing properly to keep boost out of the crankcase. Some oil dripping off the breather is normal as there is no baffling to keep it from slopping up in the filler tube and getting on the filter element...then it eventually drips down on the VC or manifold.

As a test, you can zip tie a sandwich bag over the filter and poke a small pin hole in it....power brake to build a little boost and see if the bag inflates. If it does, you either have ring blowby or bad PCV....compression seems fine, but with high boost, anything is possible.

 

[rtviper]

Thanks for the responses. Just before I went racing I disconected the PCV valve and put a cap on it. Maybe that might contribute to the small amount of blowby?

 

[TurboTR]

IME the GN1's should have seals on int and exh valves. However, depending on which seals (ie the common white teflon ones), they can sometimes "blow" or slide off

TurboTR