Potential Damage With Blown Turbos

[wrxhoon]

ahh ok, sorry. newbie here...

There are a few threads about this, do a search and you will find plenty to read about it ...

[rb26s13]

heres mine..

rear exhaust? sorta lol

front exhaust

front comp

rear comp

Edited February 14, 2007 by rb26s13

[MANWHORE]

Initially I didn't believe it myself, but I've read so much about it on sau as well as from various sources (I got really interested in it - self interest project).

The main argument presented against it happening is that the ceramic is merely dust and it has to combat high velocity gas to go backwards.

The thing is though, some of the particles are actually quite significantly bigger than dust. If you have a look at wrxhoon's pistons, you'd need some pretty big dust to do that.

Also, think about this this way. The particles are moving with a lot of momentum. Imagine if you shot a gun into the wind. It would still go against the wind even though the wind is strong. Think of the relative difference.

[ducki]

can this happen to rb25?

[amosite]

that is an interesting question!

[Beer Baron]

manifold design on the 25 is very different. all 6 cylinders into a comon collecter, plus longer runners. so I've never heard of it on a 25.

plus what's an exhaust wheel spinning at on boost? 100,000rpm? 120,000? must be well up there. when it finally does break up it will be fairly hauling in almost every possible direction.

[wrxhoon]

can this happen to rb25?

Not likely but I guess its possible. I have never seen it happen.

[neshgtr]

just a quick question.. i did my exhaust wheel in rear turbo which ended up in the cat.. turbo has since been replaced however i havent done a leakdown/compression test.. how much would this cost and does all workshops do it? im in melb

[hanyou]

neshgtr: im in same position as you, however my turbos are being fitted today.

is there any sign to know the engine has been damaged other then comrpession/leakdown. such as unstable idle or weird knocking noises etc?. because after mine blew and i turned it on everything seemed to be fine. other then the obvious turbo not working lol. although i can hear the peices in my cat

[MANWHORE]

The way I see it, there are differing degrees of stuffed-up-ed-ness.

I have seen compression test results where the rear cylinders are all slightly down compared to the front. I suppose that woudl mean that a slight amount of wheel went back into the engine.

There are also the really bad ones where compression is like 50psi (like wrxhoon's).

If it's only mild, you probably won't feel anything?

Why wouldn't you just get a compression/leakdown test?

It's just like going to the doctor - I think my arm is broken, but I don't want an xray. Will antibiotics work?

From what I've read, it seems that in about 1/3-1/2 of the times that rb26 turbos blow, the engine is gone. Then again, if the engine was not gone, people probably won't post about it.

PS: hanyou, about you selling your oil cooler after your turbos blew, I thought that was pretty irresponsible. When I asked if your turbos had blown, you briefly said that you do not believe in the whole wheel going back through the engine occurence. I hope you notified the buyer of it.

Edited February 15, 2007 by MANWHORE

[wrxhoon]

is there any sign to know the engine has been damaged other then comrpession/leakdown. such as unstable idle or weird knocking noises etc?.

Blow-by.

Don't forget you could have very little bore marking ( from very fine dust) and still have perfect compression because the oil blocks it however a leakdown test will show it.