cummins 250 with turbo - Steel Soldiers::Military Vehicles Supersite

eddiec · 02-09-2007, 18:18

Well, as most of you know, I am currently without a MV. But with the upcoming arrival of my (new) 1963 m543, I have been doing a lot of searching, and studying, both on the sight, internet, as well as at all of the truck shops around this area.
My soon to be, "thanks Hot Rod" is at present time a gasser, but will be converted, either a mack or the cummins. in my resent questioning, i have learned that a jacobs exhaust brake does not hurt the engine at all, for either engine. I had been leaning toward the mack because of the turbo, but recently been told, and shown civy examples of, the cummins with a turbo installed. I have also been told that other than the changes in adjustment on the IP, there is nothing to do but bolt it on.
I know, the srossover tube will not fit between the hood and the valve cover, but you do NOT use one.
What is used is an intercooler. The air will go fron the turbo, through the intercooler, to the intake. I didn't think it would work either, but the ones that i was shown will fit between the brush guard and the radiator, just have to make the connecting brackets. (or pull a favor at your local cummins shop, and international dealership, very easy to do if you tow for them.) and i do believe that we will all agree that the cooler the air is coming into the engine, the better.
nope, no pics. delivery will not be till march, but then the fun begins.

WillWagner · 02-09-2007, 20:01

"intercoolers" aka, charge air coolers were only recently introduced on the Cummins iron...1991. Prior to that, they were aftercooled, but only 350 HP and above for pre 1984 and from 300 HP up starting in 1985. If you get a 290 to 300 HP engine, they won't be aftercooled and you can still find jakes for them. There is also a low profile turbo x-over that might fit under the hood of an 800 series truck, they were used on Ford L series trucks. You will need a different fuel pump if you turbo a non turboed engine...unless you like lots of black smoke! You'll need another exhaust maniflod too. I think the cooling package stack would be too deep to fit an 855 and a charge air cooler/radiator package too, but people do make units that are of the side by side type.

bigelk50 · 07-20-2009, 18:02

Just wondering if you have an update for us?

73m819 · 07-20-2009, 20:38

if you put the cummins in, you will need 809 sheet metal, as the cummins is longer then the mack or the multi

papabear · 07-20-2009, 20:45

That's what I thought to Ron

Alredneck · 07-21-2009, 00:24

Coldfusion21 · 07-21-2009, 16:07

2+ years for an update? Seems like this one might have gotten lost.

bigelk50 · 07-21-2009, 18:02

Thought it was a long shot, but perhaps still a shot.

martinsaunders06 · 07-27-2009, 15:34

i turboed my 250 back in march using parts from a 290 and have using it since with no probs. originally i used a temporary cross over and ovalled the tube so the bonnet would fit just to see how things went but since then i have fitted a larger cross over along towards the rear rocker cover and over as there is more than enough room there.. I kept my original fuel pump albeit it has been tweaked as i wasnt looking to get gready for power and my engine does not produce any black smoke and it still runs very clean which is contrary to what will wagner said could happen ,spose im just real lucky with that then.Martin

bigelk50 · 07-27-2009, 16:28

Thanks for sharing! Sounds like it works great. You must not be getting too much fuel if it is not pouring out black smoke. Do you happen to have any pics?