Holset H1C exhuast housing size

[THeske]

That maybe your opinion and possibly a very good one but the exhaust housing on the above said H1C charger definitely has a smaller housing than the hx35 hybrid that I purchased, By smaller i'm reffering to physically smaller going by the outside measurements of the exhaust housing, I'm going to get around to changing the turbo out some time next week so I'll know more then,

This turbo has been on this motor for a while now with out any problems,

The smaller housing could the reason I've never felt a reason to complain about turbo lag, Snappy & lots of real low end grunt

 

[THeske]

Hey Greenleaf I may take you up on those numbers, But for the time being let mother nature take care of it, If I can't do a positive ID once I get the H1C off I may take you up on that offer though,

Thanks again

 

[Greenleaf]

I'm snowed in now. I can't get to the garage anyhow... ...



I just looked at the charger on my 90 and the 21cm has a casting (Cummins no. ) of 3519297. The housing is very large and fat.



The 12 waste gated housings are quite small. The bus fleet uses them. The engines have snappy torque and positive throttle response at low rpm's but run out of gusto rapidly. I like the felling of the throttle response, espessially in a school bus which make repeated stops/starts. However, with my trucks, I'm not starting/stopping like that, so low end throttle response isn't a factor.

 

[BPaulsen]

My OPINION?



What do you think is going to happen with all that BOOST on a NON-WASTEGATED 12cm housing ?



My OPINION . . . . Oo.

 

[THeske]

My boost Isn't outrageous only a modest 27 Ib's when I load it up, But that could be the reason with the stock injectors and my fuel turned up, My egt's were higher than I liked, With the new POD's and the same fuel settings my egt's did come down, but maybe I'm not advanced enough on the Injection pump to pop those injectors at the right time, I'm as curious as you about the housing size, I just can't Imagine a 12cm2 non-wastegated housing on this turbo but it is something out of the ordinary and it does seem to work quite well, like I said snappy with lots of low end grunt, How ever I am looking for more air flow than an old H1C can deliver with out the heated boost, hence the reason for the hx35 hybrid,

 

[CSchafer]

The H1C are tough turbo's, I beat the crap out of mine with a 14ng housing for a long time with the same fueling that drives my 62 to the wastegate at 40lbs, so I really hate to think how hard I was spinning the H1C. Ingesting a couple gallons of water finally took it out, not abuse.

 

[dpuckett]

All of my "wastegated" exhaust housings have been running with the gate not hooked up, including my PDR HX35 that I ran on my 91 for a while. Either I lacked the knowledge ambition to adjust it, or the gate is set higher than I need right now (current set up- even if it WAS hooked up, it wouldnt do much good set to 35psi). So run the 12cm, just watch your boost numbers (H1C approaches the max efficiency at about 25-27psi) and Egt, and it will do just fine.



Daniel

 

[THeske]

Well fella's the turbo is off the engine

Could some one help me out on this one please, I'm tring to determine the exhaust housing size on my H1C turbo, 1990 5. 9 engine, the turbo had be rebuilt prior to me purchasing it 4yr's ago, The turbo/exhaust housing is still in the truck but with a trouble light and a mirror I've located and jogged down some casting numbers, Here goes on the front side of the exhaust housing there is a casting stamp # 2 J 8, on the back side the casting stamp reads Holset (with a large raised letter A ), then closer to the exhaust flange the casting stamp #'s are TW1, 5538055 ( I believe this is the identification # 5538055 ) then there is also the # 12-128-01, Like I stated I'm reading this by use of a mirror so there may be a mistake in my # identification but I believe them to be true, Any help or finger pointing to an known Link will be a definite asset,



Thanks fella's

And this is the result of the mysterious exhaust housing size, The inside exhaust runner is stamped as a 12cm2 housing, now the pieces are falling together No turbo lag, Higher egt's using the stock injectors and the Injection pump opened up to a just below a fast idle, I'm guessing the housing size is hidden in the above part number on the housing as there was no external positive identification 12-128-01