Gumout Q&A with Rusty Waples

Click here to participate in the Gumout Rusty Waples Q&A

Recent Topics
2016 F150 2.7 UOA - Maxlife Syn 5w30 7,165mi
by tomcruise
10/25/16 08:02 PM
Fram Ultra Rubber Gasket Failure
by ttvr4
10/25/16 07:57 PM
Wire fence problem and possible solution
by Donald
10/25/16 07:15 PM
New redwood fence
by OneEyeJack
10/25/16 06:15 PM
2012 Accord 2.4 UOA - PPPP 0w20 4,722 mi.
by gregk24
10/25/16 05:43 PM
Need new tires
by fxrider
10/25/16 04:59 PM
At what temperature Summer tires unsafe to use
by raaizin
10/25/16 04:43 PM
You guys need to be the first to get one
by CourierDriver
10/25/16 04:37 PM
'13 KTM DUKE 690 MAXIMA 10W/60 1,002 MILES + VPC12
by albertdi
10/25/16 04:32 PM
Self Driving Semi
by Pop_Rivit
10/25/16 04:21 PM
ACEA A3/B3 Oil in 2010 Acura MDX?
by artbuc
10/25/16 04:18 PM
1998 Chevrolet differential capacity (cannot find!
by TurboFiat124
10/25/16 03:17 PM
Newest Members
losman50731, VenatorLuporum, Doda1117, Optistartremote, rmercer
59445 Registered Users
Who's Online
100 registered (09_GXP, 2015_PSD, 4ever4d, 74DartSport, 4WD, 12 invisible), 1595 Guests and 16 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
59445 Members
66 Forums
256097 Topics
4209356 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: 640
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.

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

Registered: 04/30/14
Posts: 498
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.

Page 2 of 2 < 1 2