1990 Exhaust Housing?

[Hansen01]

Was just wondering what size exhaust housing is on a 1990 cummins with a usedtohave 5 speed in it?

[AHineman]

Probably an 18.5.

[Hansen01]

thinking about swappin it on to my hx35 to see how much slower on spool up it is and to see if it will reduce my egts, they look capatable, am i right?
if so jus looks like you take 4 bolts out and swap over?

[dpuckett]

On a 1990, it will bolt up to the manifold, but you will need to fab up some way to connect it to the intake. Should increase air flow and lower EGTs tul you get to higher boost numbers.

DP

[Hansen01]

rephrase this, i have the hx35 on my pickup now,it is and always has got hot on me and im thinking about swapping the 12cm houseing from the h1c (18cm houseing) to my hx 35, jus in an effort/ experiment to cool it down

[1stgenblowingsmoke]

Uhhh yeah the 18cm housing will fit but the hx-35 12cm housing puts the exhaust down pipe about and inch and a half back.

[Tacoclaw]

Not sure if you worded that backwards or not, Hansen, but it will be a direct swap if neither housing is wastegated.

If the 12cm housing that I assume the HX came with is wastegated, and the 18 cm isn't, the dowpipe will have to move forward about 1-1 1/2". You *might* see an egt relief in the upper RPMs, but it will probably just be hotter down low from the increased lag.

[Hansen01]

lol "tacoclaw" i need to stop posting things late at night but yea you got it right and jus what i was asking
thanks il try it anyway, only be out an hour or so swaping them, exactly how do you swap them over? jus take the 4 bolts out and then swap over? simple as that? or is there somethin else

[delinquent]

be careful when swaping housings not to "window lock" the housing as this will bend the turbine fins in a heartbeat.

[Hansen01]

??? window lock? lol
jus make sure everything spins in other words?lol

[delinquent]

When one side of the "window" comes down faster than the other and causes it to not move. Yea, make sure it spins freely at all times during the process.

[Tacoclaw]

Yeah, *simple* as that. Just make sure you've got plenty of good penetrating oil, a selection of hammers(You'll be grabbing bigger ones depending on how long it takes to get off), and if it's really bad, a torch.

I've had to heat 3 of them so far to get them apart. Just go easy with it, If you start getting the housing too hot you'll ruin the seals inside the turbo.

[Hansen01]

lol i knew there had to be a catch in there some place, thanks guys, il give er a shot

[thrashingcows]

I have a 89 motor in my crew, with the 18cm housing and the NV4500. I find it spools so slow......I have a HX35 with a 12cm I'm going to rebuild and install. With your 6 speed I think you'll find that it will lag quite bad. What gears are you running, 4:10's?

Also are you running an IC? If not this could be a greater source of your high EGT's. And if you don't have an IC did you upgrade the crossover pipe to say a 3". from the very restrictive stock 2" (if your lucky) crossover?

[Hansen01]

yup, got an intercooler from a 97 dodge, 3inch pipeing, i kinda figured it will be laggy, just thought about givin it a shot, 16cm housing be better?
other than water meth or an exspensive turbo im runnin out of ideas on keeping it cool