1977 GMC 1-ton Crew Cab Dually
Isuzu 6BD1 Turbo Diesel

Here is a basic description of my truck.

Engine Isuzu 6BD1, Isuzu's 6B engines, I was told, are the most popular Isuzu engine made, possibly world wide #1

• Bore X Stroke: 4.02" X 4.65" 102X118mm
• Displacement: 353cid 5.75L
• Compression ratio: 17.5:1
• Dimenions: LXWXH 44.1"X25.5"X30.5"
• Weight: 992 lbs
• Oil sump capacity: 14 QT
• Injection pump: In-line Bosch A Type
• Injector: multi hole Direct inject
• Pop pressure: 2630 psi
• Compression pressure : 441 psi
• HP: N/A 130@3200 10BTDC 150@3200 20BTDC 52.7mm/ stroke
• Torque: N/A 253lbs@1900 275@1900
  

• Transmission: NP433 in NP540 case
• Ranger 2spd mounted in front of NP540 (I can split all gears including reverse)
• Turbo: Air Research T04B80
• 8 lbs Boost @ 65mph on level ground no load

During a trip to the Oregon coast last summer with this truck and an 11-½' camper, at a gross weight of 12,000 lbs, we traveled 454 miles and saw 16 MPG. With the 2-spd I can keep my rpm's within a 500 rpm window. I normally upshift at 2300, which drops the engine rpm down to 1800. 2000 rpm in 4th-over equals 60 mph. All this is with 4:10's , Ranger 2spd 22% OD and 235/85R16 tires.

John Culver
Member #487