Quick turbo question

[payableondeath6]

Saw this on Craigslist

http://columbus.craigslist.org/pts/367579164.html

I'm going to go look at 'em today here in another hour or so and was wondering if there's anyway to make something like this work I'm considering doing a remote mount setup (that's been questioned by many but I know several that work on other trucks) and was wondering whether these turbos would be too big? I don't know how large turbos usually are or what kind these are or anything really other than what he says in the CL ad and that I can get one for $30 So I thought I'd throw it out to y'all and see what you say. If someone else is interested I could pick them both up too.

Thanks,
Matt

 

[payableondeath6]

Alright well, if the guy picks up his phone I'll be looking at it in the next half hour or so and I'm leaving now...so I guess if it doesn't look too awful huge and he'll take $30 I'll buy the one in the nicest shape. Guess I could always ebay it if it won't work.

 

[FordGuy100]

I dont know what kind of cummins engine those came out of, but being that they came out of a semi I would think that they are huge. And being that they are huge I highly doubt our engines have enough exhaust preasure to spin one of those things. Maybe they can, but I would think otherwise.

 

[poolguy]

PM Typ4. He can answer that one.

 

[Cheaper Jeeper]

The ad says they are 13"-14" in diameter. FWIW, the Banks on my turbo-ed truck is no more than 9"-10" diameter - probably less.

I'm afraid that one its gonna' be pretty near impossible for the amount of exhaust flow from a 6.9 or 7.2 motor to spin turbo that big fast enough to create any appreciable boost.

Maybe after a few minutes at constant highway speed, at or near WOT, it might get spinning fast enough to produce boost, but the turbo lag would be really, REALLY, L-O-O-N-N-G.

For anything other than highway cruising it would probably be more of an exhaust restriction than anything else...

 

[FordGuy100]

The ad says they are 13"-14" in diameter. FWIW, the Banks on my turbo-ed truck is no more than 9"-10" diameter - probably less.

I'm afraid that one its gonna' be pretty near impossible for the amount of exhaust flow from a 6.9 or 7.2 motor to spin turbo that big fast enough to create any appreciable boost.

Maybe after a few minutes at constant highway speed, at or near WOT, it might get spinning fast enough to produce boost, but the turbo lag would be really, REALLY, L-O-O-N-N-G.

For anything other than highway cruising it would probably be more of an exhaust restriction than anything else...

Thats excactly what I was thinking, it wouldnt be something you would want to deal with from day to day driving.

 

[jauguston]

One of the guys at my local diesel shop was telling me the other day a customer of theirs has a turbo from a 400 Cummins as the secondary on a compound turbo setup on a 5.9 Cummins. Says the guy gets over 120 psi boost (-:

Jim

 

[FordGuy100]

One of the guys at my local diesel shop was telling me the other day a customer of theirs has a turbo from a 400 Cummins as the secondary on a compound turbo setup on a 5.9 Cummins. Says the guy gets over 120 psi boost (-:

Jim

Holy crap, that turbo would be one screaming turbo at 120psi.

 

[subway]

One of the guys at my local diesel shop was telling me the other day a customer of theirs has a turbo from a 400 Cummins as the secondary on a compound turbo setup on a 5.9 Cummins. Says the guy gets over 120 psi boost (-:

Jim

i dont know how anything would stay together with that kind of boost. and yes i would think those turbos would be crazy huge for our engines. there was a good thread a little while back on turbo maps that might help out.

 

[payableondeath6]

Okay, well I went and looked at them, they looked to be in good enough shape (one has a couple small nicks on the wheel) and they had no shaft play at all. So I talked him down as far as I could and figured at very least I could Ebay them and get my money back. Right now I don't know much about them, but I have two turbos in pretty good looking shape and soon enough I'll have access to a shop with all sorts of tools at my college. My idea was to do a remote mount setup and if I can spool this thing and get any boost I'd be in it for far cheaper than any turbo kit...or from what I've seen around this turbo is usually used sequentially, just would rather run one to keep expense down and probably potential damage down. If you guys can help out with the pictures and details I have I'm curious as to whether I will be able to spool it, even if the lag is bad (don't want it to not kick in until redline or something) I'd think the price and any boost would make up for it.

Okay, so here's what I know about one of them, the other I haven't looked any of the numbers up on, but they look like different housings at least. This is what a little time with Google turned up.

From the tag on the turbo:
Cummins
Model No. T46
Serial No. 1067612
Assy. No. 3018066

From this website http://www.competitiondiesel.com/forums/showthread.php?t=2577&page=5
"T46 is old turbo and it was replace by HT3B , so the size is same.
This T46 is made for Cummins NT(NH)855 maximum hp 360, and turbo housing is 'single entry' style."
Turbo / CFM
HX35 / 600
HX40 / 800
T66 / 800
B1 / 900
H2E / 1000
HX50 / 1000
HX55 / 1050
HT3B / 1100
T76 / 1350
HT60 / 1400
B2 / 1500
HX60 / 1550
T88 / 1450-1750
HT4B / 1800
Big Brother / 1900
T91 / 2000
HC5A/HX82 / 2450
T100 / 2600
T105 / 2900

I know some of you are pretty good with turbos or finding information on the net, so if someone can help me out that would be great or if you can scrounge up compressor maps for it that would be awesome too. I'm sure if I can use it I will have many more questions come that time.

And some pictures:

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[ttman4]

Says the guy gets over 120 psi boost (-: Jim

I would imagine that at 120# when it goes "bang" it will be like The Big Bang!!

 

[payableondeath6]

Okay, so I was doing a little reading in the "Twin Turbos Redux" thread and picked up a little info...useful or not...I don't know

According to the equation I found, CFM = (CID X RPM X VE) / 3456

I have no idea what the VE of my engine is, so guessing at 85%. I am going to pick 3500rpm as my redline too. So,

CFM = (446 X 3500 X 0.85) / 3456 = 384 CFM

Then I'll say I want a design goal of 8 psi at 3500rpm, so that puts me at around 593 CFM desired...hmmm...10 psi at 3500rpm would be 645 CFM...so I'm sure the rated CFM number I found for the turbo was a maximum, but just for curiousity's sake lets take 1100 CFM and that puts me at 27.4 psi That's gonna be too much I think, but I don't think my exhaust will be able to spool it up that high anyways (which is I think how a non-wastegated turbo works, by oversizing it).

So how do I figure out whether my exhaust will be able to spool the turbo?

 

[Michael Fowler]

You could always rig up a propane fuel supply and some kind of ignition to power the turbo. as an on demand" type of power supplement

 

[Agnem]

That's a big turbo. How do you think you would even mount it?

 

[subway]

That's a big turbo. How do you think you would even mount it?

i think a hood scoop would be cool

i cant help much with numbers but am extreemly interested to see where this goes.