Now the turbo can spin a little, but it binds on every revolution. But it’s a moot point because the housing is toast, so I think that means new turbo time. As I understand it this turbo was specially made for this application, though I know different replacement turbos have been used because it’s just a T3/T4 flange. Hopefully the guys at central motive power (assuming they are the ones to go to) can help take the specs of this turbo and find a replacement.
For the manifold, I understand that Turbo-Glide out of Australia were the makers of the manifold for the Safari system. I have reached out to them to see if they would be willing to sell me just the manifold. A guy on mud did this a few years ago:
Hi guys, After a Christmas induced shipping delay, my turbo exhaust manifold has finally arrived from Australia. The delay has messed up my project timing plan big time as I am off to New Zealand for most of February, so won't get this fitted until March. Anyways, I got it off these guys -...
If they aren’t willing or can’t, then I guess I might have to see if I can find someone to weld it, though it’s cracked on the inside so don’t know if welding will really be enough. I don’t know of any other manifold that will line the turbo up in the proper place for the rest of the Safari system to work.
Any ideas of root cause? The system did glow orange last summer because the cat got plugged in steamboat, but I generally don’t abuse it. The PO did romp on it though from what I understand.
I'd recommend seeing if you could find a more modern turbo like a Borg Warner EFR or something that has similar specs to the original. Turbo tech has improved tons in the last decade so why not upgrade?
Only reason to not upgrade might be that the turbos and systems seemed to be tuned around not building boost too soon so the engine is running open loop when it sees boost. That's what these designs depend on for enrichment from what I understand.
excellent work on the crack repair so far! it will turn out well!
Sent the turbo to ATP Turbo in California, hoping they can match it up with something that will perform similar and bolt in. Not sounding too promising though. We will see, they will get it tomorrow (Friday).
Welder is saying the cast manifold is really porous, so is not welding well. Oy.
And then there is fun (?) with bore scopes:
What can I tell from this? I don't know. I am worried about Cyl 1. But it's at TDC and appears wet with unburned fuel so can't get a good view of what's going on. I don't know if @powderpig looks at the forums these days and could provide any input?
The main thing I was looking for here were signs of cracks in the head or valves/valve seats due to the excessive heat that is presumed to have cracked the manifold and turbine housing. I am hoping those black streaks on the valves are not indications of cracks. I am not inclined to pull the head unless someone sees something that is an impending catastrophe.
Yes, it had a valve job done about 80,000 miles ago. Running colder plugs than stock, these in particular are the MR2 Turbo plugs that I think Wits' End is also using for his turbo and I think are the plugs typically used for the TRD superchargers. Denso PK20R8
Safari recommends NGK BCPR7ES-11, which I understand are a Saab turbo application.