What would cause boost to leak out the oil cap. We tried different wastegate springs but it still did not change. Was working fine until this started about a week ago. Since that time we have not driven the car. Could it be the turbo or the motor? Could pressure leak out the turbo drain into the oil pan?
The setup is as follows;

60-1
rb holley intake
650 holley dp
tial 46mm(12lbs spring)

 

It sounds like you are pressurising the sump, this is caused by too large a side seal gap or a failed side seal...

There is no solution t this bare an engine rebuild if this is your problem.

 

BLING BLING BLING, Shane has an idea, how da fark do you know you are getting boost leaking out the oil cap? I have a theory here just i want to here how on earth you have diagnosed this problem before i go bleating out the answer to it.

 

thanks rice racing, i was taking a test pass and all of the sudden smoke fills the car. i pull over, open the hood and the oil filler tube is blown out of the housing. we hammer it back in do another test pass and sure enough at about 12lbs the smoke returns again. pull over same story. this time we spread the tube at the bottom of the filler tube and hammer it back in. we then rev the car till about 9500 while my hand is on the filler neck while the cap is off, and you can feel the boost coming out.

 

Ok, the only other thing it can be is a failed or failing rear (turbine side) oil ring seal, when this seal fails you will be able to pressurise the oil sump area as well. However with this failure you usually get A LOT of smoke out the exhaust as well...and I mean A LOT!

If you do not have this then I would say it is in the side seals that there is a problem, at least that is what I think may be the problem?

 

HN!...which RX7 is this??..im assuming its not the project 20b because you mentioned 60-1...Is RX3 running yet?

 

i think its normal... NOt strong enough to blow the cap off.. but its strong!

 

this is mine friends rx2. and yes the rx4 is running.its running half-bridged. we are taking it to the races this weekend.

 

what your experiencing is excessive blow-by...sounds like a typical side seal failure

 

thanks guys we'll be taking the engine apart this weekend and i'll let you know what was wrong.

 

HN i will be in there next weekend (LABOR DAY WEEKEND) Can i come and see you guys race?..is this STRRET OR TRACK RACE??..

 

street. come over to the house or call me.

 

HN..are cops pretty tight when it comes to street racing there?..

 

We should be there saturday morning or night. I will call your cell when i get there.

 

we opened the motor friday and rice racing was correct, it was a cracked seal on the front rotor. thanks everybody who responded.

 

No Prob.

 

Peter was right, as per usual

 

Is it really possible to loose boost through the internals of the motor?

 

HN it's a broken sideseal. A freind of mine had the same problem. And it was a destroyed side seal.