Readers' Rigs

This page illustrates some of GM diesel vehicles Readers of the Diesel Page own or drive. This month's photo and story comes to us from member John Culver.
December 1999

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
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