free bump

 

thanks

 

I don't want to leave a hanging thread. I beat the **** out the car this weekend at Lime Rock. Leaned up the fuel a whole bunch (it was running very rich, below 10 A/F) and the white smoke went away. No idea how fuel makes white smoke but I don't really care at this point, just happy the car is not smoking. Hoping this was the problem.

 

I saw this when I was watching a best motoring video. forgot what volume it was but they said the problem was caused because the car had a bit 2 much oil creating high oil pressure which causes the engine to dump oil. if that is just the case then you don't have a problem. But I would do a complete check just to be sure.

 

Do you have head studs? I wonder if you head is lifting under higher boost...

What are your mods?
What psi are you running?

 

Stock headbolts. Mods in sig as well as boost. I didn't think it was possible for the headgasket to only leak under boost, I thought once it went it went. Anyway, thanks for the suggestion. Like I said, it went away for now after pulling out fuel.

 

in your compression test, the cylinders aren't actually building up pressure the whole time. The pressure gauge has a 1-way valve on it so when the piston compresses the air to 200 psi, the gauge holds that peak value until you press the release valve. Otherwise you'd be trying to read the needle while its bouncing back and forth.

The reason the throttle body is supposed to be open is just to get more air to the cylinders so they're not sucking a vacuum. It would probably give you higher numbers if you opened your throttle.

Not sure what the popping is. Possibly your one way valve opening under pressure on the 2nd or 3rd compression stroke???

 

Enlightening