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Benino · Posted: Thu Apr 13, 2006 4:47 am Post subject: turbo central housing

Is the k26 central housing interchangeable with other k26 turbos? I'm having mine rebuilt and the housing is cracked. Just wondering how hard it will be to replace that. For example is the central housing from the 951's k26 the same?
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1980 Porsche 924 N/A USA
1980 Porsche 924 turbo USA
1987 Porsche 944S USA

Raceboy · Joined: 01 Mar 2004 Posts: 2327 Location: Estonia, Europe

Central housing - do you mean where oil lines go in? If it's this one, then 951 unit has water cooling passages also, but othervise it's the same. Some Audi K26 units have also water cooling but the center section is the same.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
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Tigger937 · Posted: Thu Apr 13, 2006 3:46 pm Post subject:

Benino · Posted: Fri Apr 14, 2006 1:41 am Post subject:

I am talking about the central part that the oil line goes into and where mount connects.

I'm assuming the turbos aren't interchangeable. The compressor and turbine housings are probably different sizes. . .

I hadn't thought about the water cooling part. Would I be able to take a central housing from a k26 that uses water cooling and just not connect those lines? What would happen would be that the turbo rebuild shop would use my compressor and turbine housings and probably the spinning parts (because the size of impeller depends on those housings right?), and use the central housing from the other turbo. This is getting pretty complicated and speculative. lol. I think I should just try to find a better 931 s1 turbo. :-/ I thought mine was ok but it sounds like it's pretty much shot.
_________________
1980 Porsche 924 N/A USA
1980 Porsche 924 turbo USA
1987 Porsche 944S USA

Smoothie · Posted: Fri Apr 14, 2006 1:52 am Post subject:

You're sure it's the central piece that's cracked? -Usually the exhaust side housing cracks.
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"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

Raceboy · Joined: 01 Mar 2004 Posts: 2327 Location: Estonia, Europe

The mounting for the back plate of the comp housing and mounting for the turbine housing are the same. You can use 931 rotating parts and put them into 951 unit. The whole thing needs to be rebalanced after that.

Even K28 compressor was a bolt on job for the 931 K26 center section.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

Benino · Posted: Fri Apr 14, 2006 6:48 am Post subject:

I was surprised by that too. I just talked to the rebuild shop again and you were right Smoothie. I'm not sure if he misspoke before or if I misunderstood, but it is the turbine housing that is cracked on the central housing side. (not visible without taking the turbo apart). Apparently the turbine and shaft unit is too badly warn as well. . . .

I started this project with two 1980 turbos expecting that out of both of them I'd be able to make one. . . but I was wrong. Both have cracked turbine housings. Now I guess I'll need to buy a remanufactured turbo. If I gamble on another used turbo first I'll run out of money. :-/ Where can I get the best deal on a good remanufactured turbo that has not been used.
_________________
1980 Porsche 924 N/A USA
1980 Porsche 924 turbo USA
1987 Porsche 944S USA

Raceboy · Joined: 01 Mar 2004 Posts: 2327 Location: Estonia, Europe

It depends where it is cracked.
If it's from inside the snail, and not visible from outside, you can use it. You feel no differenca in power and you have to rebuild it anyway after couple of years of driving.
I'd recommend that you let it rebuild and just look for spare remanufactured turbo in the meantime. You'll have some breathing time too (of coughing cash to everybody)

_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

Benino · Posted: Sat Apr 15, 2006 12:13 pm Post subject:

So does anyone know a good source for a rebuilt unit? I don’t know that I want to go through with this rebuild. The shop told me I need a new shaft and turbine . . . and I think he quoted a price over 200 for just that part. So I'd be paying that and then the price to have it rebuilt to have a turbo with cracked housing. Any place with rebuilt units u guys know of?
_________________
1980 Porsche 924 N/A USA
1980 Porsche 924 turbo USA
1987 Porsche 944S USA