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930gt-40r's Avatar
Join Date: Jan 2007
Location: Boca Raton, FL
Posts: 2,063
rusty turbine housing advice...

Got a turbo the other day (will post pics soon) that has a .85 hot housing installed and a spare 1.06 housing. The 1.06 housing was never used, but had a some scaley rust on the surface of the radius where the turbine is close to the housing. My question is: is this back housing destroyed or can I still use it. The scale was a slight layer that came off and I just got done sand blasting it (don't worry I was light around the area where the turbine is close). I am just wondering if the scale that came off took off enough material to screw up the tolerance between the housing and the turbine itself. I hope Brian and the other turbo pro's can weigh in on this...
Kris @ Tech9
86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 02-23-2010, 05:15 PM
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Wo ist die Rennstrecke?
DonE's Avatar
Join Date: Mar 2004
Location: Brooks, GA
Posts: 1,211
Last time I saw scale as you described was with a housing that got too hot. The turbine side intake flange was even warped.
Old 02-23-2010, 05:47 PM
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Join Date: Apr 2005
Posts: 24
The center cartridge will sit in the recess of the turbine housing. You have to pay attention to the area that the heat shield will sit/seat. It is the heat shield that will give you the seal. A little trick that you can apply "when" you have some corrosion to the interior mating surfaces is white lithium grease. When you get the temps high enough the grease will turn to carbon and seal up the small corrosion.

If the area of concern is inside the the radius seat or profile >the turbine wheel head runs in the radius. Any major erosion will effect the hot side efficiency of the turbine wheel. If you are peeling off metal strips or strips on the radius, that is usually from turbine wheel rub from a failed cartridge. The turbine wheel has made contact with the turbine housing. You have to very careful in this situation. Metal transfer that is NOT removed and still embedded will dislodge right into the path of your rotating turbine wheel.. You'll be left with a trashed wheel.
Old 02-23-2010, 09:40 PM
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