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View Full Version : Blown turbo cause of bad motor? WTF Now?


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Outlaw1
10-21-2005, 11:07 AM
When something goes through the turbo and does that kind of damage, it often blows the seals also since the shaft gets so tweaked when the wheel slams into whatever.
I think the majority of the people (excluding yourself, ecoli) have a misconception that the turbo has a standard seal like you'd see on an engine somewhere. This "seal" gets blamed for lots of turbo problems. It's kinda hard to visualize, but a typical turbo shaft is supported by two bearings and has two oil control rings, a bearing and oil ring on the compressor side and a bearing and oil ring on the exaust side. That's basically the whole turbo as far as moving parts go. If the bearings are still tight and keep the shaft spinning on a single plane, the oil rings typically don't let much oil get past them. They don't really "wear out". Now if trash goes through the oil system causing the bearings to wear, bearings get sloppy, the shaft wobbles around and the oil rings don't have a constant surface to seal against. Oil will spew past them. There's not really many parts inside a turbo to mess up. Keep fresh clean oil to them and don't shut the engine off (shutting the oiling system down) while the turbo is spinning 100,000 rpms and your turbo should have a long happy life.

niterydr
10-21-2005, 11:34 AM
I would also be inclined to bet something went through it, be it motor damage, or something left over during install (or something melted).
Unless the comp wheel is toast, then it could be a build issue.

A//// Guy
10-21-2005, 12:17 PM
Yea now that I read about the "loud blowoff" sound, I think something went throught he turbine wheel. Maybe sparkplug peice or the EGT or something else.

If the wheel was hitting the housing then like they said, the compressor wheel should look the same.

howslowcanyougo
10-21-2005, 04:38 PM
There was lke Zero damage to the Comp wheel which would point away from the seals and to something letting loose in the motor?

Gonna pull the plugs and try atleast a comp test tonight.

I'll repost then with my results.

Many Thanks to all the great input!

Outlaw1
10-21-2005, 04:41 PM
Don't spin the engine over to test the compresion without plugging the oil feed line for the turbo or you will spray oil everywhere. And take pics of the broken stuff!

There was lke Zero damage to the Comp wheel which would point away from the seals and to something letting loose in the motor?

Gonna pull the plugs and try atleast a comp test tonight.

I'll repost then with my results.

Many Thanks to all the great input!

1ViciousGSX
10-21-2005, 05:43 PM
Since you already have the turbo off the engine, pull the exhaust manifold and look into the exhaust ports on the head. If something went wrong in the engine there will be indications of it in the exhaust ports, whether it's oil, a bad looking valve, something caught in a valve, etc.

howslowcanyougo
10-22-2005, 11:29 PM
Since you already have the turbo off the engine, pull the exhaust manifold and look into the exhaust ports on the head. If something went wrong in the engine there will be indications of it in the exhaust ports, whether it's oil, a bad looking valve, something caught in a valve, etc.

Pulled all the plugs, they looked fine, and so did the valves up inside the ports in the heads?

I can't see any indication anywhere <yet?> that "something" or anything came out of the motor and into this turbo?

So now I've been looking around for a leakdown tester here local, I can't seem to find one?

What's the real difference between a leakdown and just a compression test?


TIA.....

niterydr
10-22-2005, 11:54 PM
Compression will tell you if the motor is good or not, a leakdown tester will tell you that, plus what is screwed up (if used properly).
You should atleast do a comp test.

howslowcanyougo
10-30-2005, 08:22 PM
Finally got the final word from SBR.

They will rebuild this turbo like new for $400.00

It cost almost $1100 new, so I guess thats not a bad deal, except I still don't beleive it was my fault it went out and I don't want this Huge Lag monster any more!

I just bought Tom's T28 for under $300.00 should do me fine for a nice and quick spooler on this A/T car.

EclipseGST
10-30-2005, 08:32 PM
Huge lag monster? Your talking about a 20g. You dont even know what lag is yet with that snail.