Thread: Turbo Stockers
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Old 08-02-2010, 04:12 PM   #2
art leong
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Default Re: Turbo Stockers

Quote:
Originally Posted by Rob Lloyd View Post
I'm not to worried about the compressor side. It's the turbine I'm worried about. I have a good turbine housing, but all of my turbines measure at least 0.04 smaller than the housing at the exducer. I think maybe my turbines are worn down pretty far. My guess is it should only have 0.01" clearance, but I don't know for sure what the turbine is supposed to be. I found some specs that say it should be 1.88" - mine measure more like 1.84". Ouch! But, again, the housing bore measures close to 1.88" So, I don't know if that spec is for the housing or the turbine.

You definitely do NOT want 2mm clearance around the compressor. It will cause a very slow boost rise. You want as small a clearance as you can run on the compressor side.

Related question - Art, did you have trouble seizing the wastegate arms? I seem to seize one up every single season. The 'good' turbine housing I mentioned above I shelved because it seized the WG arm. I took it apart and reamed it out, but I'm concerned it will just seize up again. I reamed it with a 5/16" drill (the arm measured 8mm, so there's alot of clearance now). Just gotta get the arm welded back up and put my 'good' turbine in there for Indy...
It happened to me a few times especially when the car sat for a couple of months. I would just free it up. Then put it back together.
It happened when I sold the car to Jim. Took it to Cecil County Went to the line, The car left like a garbage truck. I knew what the problem was but the look on Jims face was priceless I knew he was thinking what did I come up here for? Loosened it up, ran the expected number. And the car was on it's way to Fla.

If I were you I'd look for some heat resistant preoiled bushing And install that.
It seems to be the leaded gas that does it Jimmy Malone hasn't had it happen to him that I know of and he uses the VP unleaded.
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Last edited by art leong; 08-02-2010 at 04:15 PM.
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