poorman4x4
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I also have a cummins 400 big cam III swap coming up in my M923, midnight locate an 80's model kenworth dime a dozen in the south
Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
I guess youv'e never had a truck on the back of that M819.I find my 36,000 lb, m819 has plenty of power, the trans sucks (3rd to 4th hole), will run 60+ all day, do not see where more power is needed unless 70 mph is wanted which the 900s are not designed for., military trucks are not designed for interstate speed.
Guys I am that buddy, and here's my two cents you can turn up a 250 to way more than it will stay together with turbo or not, I like the old 250 but would Not turn it past 300. If you need more than that go big cam, I have three trucks on my yard that are stock with rods in a bad way. I have a 290 that will be in my wrecker one day and I will be building it to 400 specs. If you just want to get a little more fun out of a 939 I would look at the 8.3 in the a2. But if you are going to work it go big cam or other OTR motor.I would say that you need a turbo if for no other reason than to keep down the smoke.
For what it would cost to do all those mods you can prob buy a M915 and take the engine out of it. They just cut four of them up at my buddys place at Camp Shelby.....engines and trans (Allison) together went for a less than 4 grand.
I am going to install the pyro prob in the center section, right at the point where the two ends merge to the center, a couple of inches up from the pipe bolt flange.Please post pics how the pyro is installed in the manifold!
I was under the impression that 5 and 6 were the hottest, because of the lack of air flow and being the furthest from the W/P, but I was told I was wrong and that 3 and 4 are the hottest, because these two have the least surface area to dump the heat. SO that is why I am putting the prob where it's goingI don't about the NHC 250 but on a 5.9 Cummins the front cylinder is the hottest. It is because the manifold doesn't expend gases in the front as well. I would be interested to see how the 250 does
Watch that 2350 rpm, 855s DO NOT like over speed very well, also our 250s have NO PISTON OIL SQUIRTERS to help cool the piston and helping to lube it. the 290s do. your building a 290/300 but it still will be a 250 with a turbo, the difference is the 290 is built as a 290 which includes the piston squirters, ip setup, ect.Just adding in my .02...
I've got a 931 I hope to pick up next weekend. This thread is VERY interesting to me.
I've got a lead on a turbo setup. (HT3B and exhaust manifold) If I can find an intake to clock the inlet towards the passenger side I'll snag it. If not, I might try to install an aftercooler or innercooler setup. Next, I'll do a button change on the PT as well. Last, I'm going to source a 2350rpm gov spring setup.
I'm just aiming for ~300hp and a tad more operating rpm. I'll be swapping out the duals on it to super singles and Goodyear MVTs (395's with the 68mph rating). Running the numbers, the 395's and the gov mod would put it matching the tire rating for top speed. More importantly a 55mph cruise speed would be 1890 rpm.