[sdeeter19555]

So my baby H1C is getting play in the shaft. I would be surprised if it doesn't start to leak or if it starts touching the housing. I rebuilt this one with a Turbo Labs kit nearly four years ago, about 1000 hours on it. I feel that, even though I kept all pieces lined up, something was off/out of balance (it had been lightly rubbing the housing before I got the truck).

I have a WH1C that's been sitting, is that worth installing? I'd rebuild it before I go that route. I know it would need modified to work with the non-IC crossover and I'm guessing the oil supply and drain are likely different?

Another option is to send the baby H1C off to Turbo Labs and have them go through it. That looks like about $500 with shipping, parts, etc...

 

[u2slow]

I working through the WH1C swap.... Slowly. I think the oil supply and drain are fine.

 

[sdeeter19555]

One other change would be the intake hose...the baby H1C has a smaller inlet flange than the WH1C if I remember correctly?

I'm torn, if I send the H1C out, they very well could tell me it's trash. I could just throw another $50 rebuild at it and go another three years down the road...guess I need to call Turbo Labs.

 

[u2slow]

I'm using the 91-93 intercooled intake hose.

To me, any bigger/newer turbo is the way to go. No question. I'd be trying to fit the large H1C if i didn't have this WH1C.

 

[sdeeter19555]

I'm using the 91-93 intercooled intake hose.

To me, any bigger/newer turbo is the way to go. No question. I'd be trying to fit the large H1C if i didn't have this WH1C.

Ok, you have me convinced to drag that WH1C off the shelf...

 

[sdeeter19555]

Ok, so it needs rebuilt. It is loose but not touching the housing. It's actually not in too bad of shape overall...

My concern is that I thought this was a component-balanced deal, and this six-sided nut indicates it is a assembly-balanced deal. And that is the issue I had with my baby H1C, I feel I got the assembly out of alignment even though I was extremely careful to keep the components aligned (even a thousandths out would cause some out-of-balance).

So, it appears the exhaust flange is the same, the intake flange is a LOT larger, so would need to source a later-model intake hose. I would also need to source a THD crossover tube for a HX-35 to adapt the flange as-is or grind the flange to work with the OE crossover.

 

[sdeeter19555]

I guess the million dollar question is do I rebuild the H1C again for another three years and send this WH1C off to Turbo Labs for refreshing?

 

[9297oldram]

I guess the million dollar question is do I rebuild the H1C again for another three years and send this WH1C off to Turbo Labs for refreshing?

Turbo Labs sells rebuild kits on Amazon, I bought a kit a few years ago and rebuilt mine. If I can rebuild one I know you can.

 

[Rug_Trucker]

I guess the million dollar question is do I rebuild the H1C again for another three years

3 years? How much use do you give them?

 

[sdeeter19555]

Turbo Labs sells rebuild kits on Amazon, I bought a kit a few years ago and rebuilt mine. If I can rebuild one I know you can.

I know they have kits to rebuild, it was an Amazon Turbo Labs kit you recommended three years ago that I used!

I already rebuilt that baby H1C, but only three years and less than 50k later it has shaft play...it started nice and tight.

 

[sdeeter19555]

3 years? How much use do you give them?

Daily driver, roughly 400 miles a week?

What I'm saying is that this H1C may be out-of-balance which accelerated the wear. The component-balanced deals are easy, the assembly-balanced deals require keeping everything perfectly aligned. Instead of doing that again, send it off and have it rebuilt; they can balance it.

 

[sdeeter19555]

Upon a little research, it seems some of these assembly-balanced Holsets have witness marks to align them...that WH1C does in fact have witness marks on the shaft and (very lightly) on the compressor wheel flange.

So I guess my move is buy two rebuild kits, rebuild the baby H1C before it gets worse (see if I missed the witness marks on it) and rebuild this WH1C for down the road. This would also give me a chance to compare the two and see what modifications I would need to make.

 

[9297oldram]

Upon a little research, it seems some of these assembly-balanced Holsets have witness marks to align them...that WH1C does in fact have witness marks on the shaft and (very lightly) on the compressor wheel flange.

So I guess my move is buy two rebuild kits, rebuild the baby H1C before it gets worse (see if I missed the witness marks on it) and rebuild this WH1C for down the road. This would also give me a chance to compare the two and see what modifications I would need to make.

I was thinking that I read Possibly from Turbo Labs that they only balance the compressor wheels on those turbos.

 

[sdeeter19555]

I was thinking that I read Possibly from Turbo Labs that they only balance the compressor wheels on those turbos.

I decided to email then and get costs...if the costs aren't bad, have Turbo Labs rebuild and refresh them...

Their immediate response was for a photo of the baby H1C as they said there are several versions...so get that, then see what they say.

I guess one question I have is what the max output the WH1C can push? My baby H1C will push to and hold 21 to 22psi on a long hard pull while EGTs stay under 1250F. Is there a notable benefit swapping them in a barely modified daily driver?

 

[sdeeter19555]

So one last question, is the WH1C nearly a direct swap to an H1C?

 

[9297oldram]

So one last question, is the WH1C nearly a direct swap to an H1C?

Good question I know they are both T3 flange.

@u2slow might know this answer.

 

[sdeeter19555]

Good question I know they are both T3 flange.

@u2slow might know this answer.

I'm mostly concerned with the oil feed line.

I believe the drain uses the same flange, I need the later intake tube, and the exhaust flange is the same.

 

[u2slow]

I'm mostly concerned with the oil feed line.

I believe the drain uses the same flange, I need the later intake tube, and the exhaust flange is the same.

I checked the old baby h1c on my shelf, and the oil feed line fitting is missing. I guess that's the one swapped onto the wh1c when I stuck it on the '90 engine for mockup... where the line is connected now.

Edit: nm... it clicked.... the rubber intake hose.

 

[sdeeter19555]

So I found an intake tube from a 92 Cummins on eBay, that's procured.

I've read the same oil feed line works in all of them, it is the adapter deal that screws into the turbo that changes. I think I read that the H1C and WH1C share the same adapter.

I got a price from Turbo Labs of $400 plus shipping both ways. Kinda defeats the purpose. So I'm going to try my hand at rebuilding this one. This one does have witness markings, so may be safer there.

The only thing to figure out is the intake horn, and I think I'm just going to buy the deal from THD with the HX-35 flange. That would solve that dilemma.

 

[u2slow]

I'm halfway through grinding the compressor outlet. I thought I had taken enough off, but not yet. Free mod imho.