Recent Topics
9/1-10/5 Pep Boys Sales Ad
by tenderloin
7 minutes 44 seconds ago
To Buy the Jug, or use another weight?
by Timo325
28 minutes 53 seconds ago
8/31-9/7 Pep Boys Sales Ad
by tenderloin
32 minutes 35 seconds ago
weedeater one we261
by turbodieselfreak
47 minutes 31 seconds ago
Engine rebuild durability?
by PandaBear
58 minutes 23 seconds ago
FRN is back
by larry007
Today at 12:41 AM
Who makes TrueGard brand?
by Datsyuk
Today at 12:38 AM
Pennzoil Platinum 15w50 Pallet 125 boxes/ 6qt
by Datsyuk
Today at 12:26 AM
8000 H&K G36 Assault Rifles
by Merkava_4
Yesterday at 11:42 PM
OC Tomorrow
by redhat
Yesterday at 11:13 PM
Pennzoil Platinum $1.99 a quart. Menards.
by bprat318
Yesterday at 11:00 PM
Shoulder popping/crunching
by lawman1909
Yesterday at 10:49 PM
Newest Members
DennisWaller, DMackey, Mambo_Dave, 2165, JohnSawyer
51160 Registered Users
Who's Online
23 registered (babbittd, 01_celica_gt, 3800Series, Black_Thunder, 901Memphis, Blasar, 2 invisible), 666 Guests and 214 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
51160 Members
64 Forums
218606 Topics
3447033 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG

Page 2 of 2 < 1 2
Topic Options
#3066278 - 07/15/13 04:54 PM Re: Duece and a half [Re: ridgerunner]
2cool Offline


Registered: 07/13/11
Posts: 422
Loc: Delaware
The engines in the olde Truck, 2 1/2 ton, 6X6, M-48, were compression-ignition engines designed by M.A.N. (Machinen fabrik von Augusburg und Nuernberg) built under license for the Army by Mack, Continental, White, and Hercules. The pump was a Bosch single piston distributor type, where the fuel lines from the pump to the injectors looked for all the world like reallly long spark plug cables. As the fuel entered the pump, it went through the Fuel Density Compensator. The density of the fuel would cause an adjustment of the quantity of the fuel injected, and change the injection timing. The theory was that the denser the fuel, the more energy. The denser the fuel, the more time it would take to burn.

IIRC, the Technical Manual called for 1 Qt. SAE 10 oil per 10 gallons of gasoline, just to lube the pump. It would get much lower mileage on gas, but it would go. I believe that even with a turbo, the output was 130 hp. But then the Army only planned on it going 35 mph in line-haul style operations.

Top
#3358955 - 05/01/14 02:42 PM Re: Duece and a half [Re: ridgerunner]
ironman_gq Offline


Registered: 04/30/14
Posts: 106
Loc: MN
The old ones would run on just about anything because the injection systems were a lot more robust and simple. The old injectors were just a poppet valve with a nozzle on one side, it fired once per compression cycle and didn't need to be too terribly precise in metering fuel. Same with the pumps, they ran at a couple thousand psi at most, The new fuel systems on these trucks are using electronically fired injectors that can fire 4-5 times per cycle and pumps that operate at 30 thousand psi. To do that everything must have very precise tolerances, a change in fuel viscosity or a little debris in the fuel and the whole thing falls apart and parts get damaged.

Top
Page 2 of 2 < 1 2