Recent Topics
Looking for new mechanical pencil
by Merkava_4
08/23/16 09:33 PM
Sewer gasses in bathroom
by sxg6
08/23/16 09:13 PM
I am a idiot, a fool or what? UOA coming soon!
by Vern_in_IL
08/23/16 08:57 PM
4ft LED T8 replacement bulbs 6.97$
by Rand
08/23/16 08:35 PM
Low cost sedan looks better than expensive one
by HTSS_TR
08/23/16 08:22 PM
Toyota red in motorcycles/snowmobi
les

by Altydoc
08/23/16 07:42 PM
Looking at some old posts
by Oldmoparguy1
08/23/16 07:35 PM
Towing a heavy trailer
by Donald
08/23/16 07:31 PM
Envelope Budget System
by GMFan
08/23/16 06:37 PM
Saving OPE after a flood?
by Geauxtiger
08/23/16 06:18 PM
Late 80s/early 90s oil tech
by Pepsibottle1
08/23/16 06:08 PM
Best MT Fluid?
by mattri
08/23/16 05:48 PM
Newest Members
FJCurious, kburns, Kev74, Dakotakid, ChicagoOiler
58896 Registered Users
Who's Online
103 registered (addyguy, 04SE, A1O, alarmguy, 2010Civic, 11 invisible), 1604 Guests and 8 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
58896 Members
66 Forums
253475 Topics
4160710 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: 618
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: 487
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