ktm Posted May 13, 2007 Share Posted May 13, 2007 As the title says, does this look right for a compressor wheel. This is a Garrett T03/04E turbo: Quote Link to comment Share on other sites More sharing options...
G.I.jonas Posted May 13, 2007 Share Posted May 13, 2007 Wtf,i would say someone got shakey trying to do some porting but i dont know,doesnt look that way,weird. Quote Link to comment Share on other sites More sharing options...
Monossi Posted May 13, 2007 Share Posted May 13, 2007 Are you referring to the grind mark on the compressor wheels 12:00 ? If so , that is a balance mark. A SLOPPY balance mark , but a balance mark. The turbo shop has a machine that (without going into to much detail) balances the compressor wheel & turbine wheel together as a rotating assembly. The grinding mark comes into play when the builder/rebuilders machine says it is out of balance. So the builder cannot add weight to any one side ....... so he takes the rotating assembly & grinds a little.(removes a little material from the heavy side of the rotating assembly in attempt to even out the uneven weight distribution) So it is important to grind in as little increments as possible. From your pic it looks like a classic case of the rebuilder getting to agressive & accidently getting into the inside leading edge of the compressor wheel itself. It is considered cosher to (sp?) to grind into the nut & top of compressor wheel , but when you get into the inside leading edge of the compressor wheel fins you should replace the nut & compressor wheel & start over....... I worked in a turbo shop for a year & a half. Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted May 13, 2007 Share Posted May 13, 2007 Are you referring to the grind mark on the compressor wheels 12:00 ?If so , that is a balance mark. A SLOPPY balance mark , but a balance mark. The turbo shop has a machine that (without going into to much detail) balances the compressor wheel & turbine wheel together as a rotating assembly. The grinding mark comes into play when the builder/rebuilders machine says it is out of balance. So the builder cannot add weight to any one side ....... so he takes the rotating assembly & grinds a little.(removes a little material from the heavy side of the rotating assembly in attempt to even out the uneven weight distribution) So it is important to grind in as little increments as possible. From your pic it looks like a classic case of the rebuilder getting to agressive & accidently getting into the inside leading edge of the compressor wheel itself. It is considered cosher to (sp?) to grind into the nut & top of compressor wheel , but when you get into the inside leading edge of the compressor wheel fins you should replace the nut & compressor wheel & start over....... I worked in a turbo shop for a year & a half. I think the leading edge marks are some of that white paint seen on one of the impeller blades. Looks like it got smeared onto the edges to me.... The turbo looks fine I think. Quote Link to comment Share on other sites More sharing options...
ktm Posted May 13, 2007 Author Share Posted May 13, 2007 The marks on the edges of the blades are grind marks. The central shaft right below the nut is scored as shown in the picture. Quote Link to comment Share on other sites More sharing options...
Monossi Posted May 13, 2007 Share Posted May 13, 2007 That is a sloppy balance mark . That being said , I think it will work fine as long as there are not any other issues with the turbo. Good luck Quote Link to comment Share on other sites More sharing options...
ktm Posted May 13, 2007 Author Share Posted May 13, 2007 Monossi, I figured it was a balance mark, but it seemed rather excessive to me. Thank you for your insight. Quote Link to comment Share on other sites More sharing options...
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