Compressor wheel damage ?

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Jul 24, 2011 | 06:34 PM

stevieturbo

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From: Norn Iron

Compressor wheel damage ?

Would you be shitting yourself if you seen this ? Spotted at random. YSi blower. Cant get access to view the rear of the blade. Given a rub with scotchbrite to try and clean it.

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Photo taken from earlier, not quite so clean, but still visible. Several high rpm blasts whilst tuning between first pic and second pic. ( only reason I was in there earlier was I was cleaning the air filter )

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Why does it look so much like a crack ?

Just checked some photos from 2007 when the bearings failed. The line is visible way back then ? Still looks bad today though ?

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Jul 25, 2011 | 10:40 AM

slow67

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From: DFW

It could be casting flash....but it could be a crack...I'd take the volute off and get a mirror and see if you can see the backside?

Jul 25, 2011 | 01:24 PM

stevieturbo

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From: Norn Iron

Weird...just remembered I took photos when it was brand new. Always a good thing !!

There is definitely a mark there when new. So in a way that's good to know. Still looks wrong though !!

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Jul 25, 2011 | 02:07 PM

killernoodle

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There is some kind of dye you can put on it that will seep to the other side if it is a crack. I'd check it out before you ruin the compressor housing and suck a piece of aluminum into your engine.

Jul 25, 2011 | 03:23 PM

stevieturbo

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From: Norn Iron

I'll be racing this weekend regardless. Probably only time this year I will, so whatever happens happens. Chances of any debris making it into the engine are very slim.

But yep if it goes, the compressor cover will be fucked.

Maybe someone will make me a billet upgrade then lol

Jul 25, 2011 | 04:56 PM

subarubill96

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From: hamden, ct

sure looks like a casting flash to me but i cant say id sleep well without knowing for sure. Ive seen compressor wheels come apart at speed and its not pretty.
What was the deal with the previous bearing failure, age or something else?

Jul 25, 2011 | 05:38 PM

hickamhatch

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I've had a compressor blade chip off. It got stuck in an intercooler.

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Jul 25, 2011 | 05:55 PM

stevieturbo

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From: Norn Iron

Quote:

Originally Posted by subarubill96

First bearings failed due to overtightening the belt. After that I went through a few sets due to paranoia about them.
But current bearings have been in for some time now.

And paranoia about belt slip was the reason for overtightening lol. Even with a 12 rib dedicated drive at the top end there was small amounts of slip. Fitting a brace at the front allowed plenty of tension which almost eliminated it.
How some of you guys in the US manage with even smaller pulleys than me, and less ribs without slip is a mystery.

So, I decided **** that. Cogs are the only way forward to eliminate slip. So I'm now on a 50mm cog drive, with barely any tension on the belt and it's working great. And quite noisy lol