looks like the screw got stuck on this blade and bent it down it and passed through...
I was puzzled for a few minutes as I coudn't believe that would cause my issue....however when I tried to check for shaft play.....ugh:
so the screw pretty much threw the wheel out of whack, it doesn't spin true at all. When I pulled the compressor housing off and spun it in my hands, you could see the turbine side wobble and contact the heat shield thing.
New turbine/shaft is on. all should be kosher again.
I experienced a similar engine digestion experience. I had the throttle cable too tight and the repeated stress from the TB shaft resisting full throttle nearly all the time on the track (race car) popped the rivet bases off. Yes, the TB butterfly/shaft had rivets - not screws. They did make it through the engine and out the other side.
But it was the beginning of the season and I opted to race than buy another engine and sit home. So I ran the car like that for another six weekends. When we pulled the head, two of the piston tops looked like the took on some close range bird shot. The parts apparently went a few cycles before making it out past the valves. And the exhaust valve seats were pretty beat up from passing the parts.
Wish there was some way to find that screw. Hes been through quite the journey.
I heard it rattling the exhaust when i drove to work....i know exactly where it flew out....but i anit going to go looking for it. But i would be curious to see what it looked like. whateves, i just want a working turbo again.
I have done this mod many times on motorcycles, it common on the ITB setups, our flow testing showed a 4-6% flow gain. We did it a little differently. we totally removed the bar above the butterfly, then used counter sunk screws. We would counter sink the butterfly's then machine the heads of the screws so they were totally flush. We would Locktite the screws but leave the threaded end a little proud. We would then stake the thread with one good blow with a center punch before grinding the thread flush. We have never had one come undone. We also knife edged the butterfly, on alternate side, leaving the closing edge intact and knife edging the back.
Last edited by FastG; 07-20-2008 at 11:47 PM.