Quote:
Originally Posted by Rob Lloyd
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...
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And what would be the reason for having movement in the waste gate arm?
Is that what they call "bracket mode" ?