Oldsmobile Diesel engine

From Wikipedia, the free encyclopedia
  (Redirected from Oldsmobile Diesel V6 engine)
Jump to: navigation, search
Oldsmobile Diesel
GM Olds' Diesel logo on a Buick.jpg
Manufacturer Oldsmobile
Production 1978–1985
Combustion chamber
  • 261 cu in (4,280 cc)
  • 263 cu in (4,310 cc)
  • 350 cu in (5,737 cc)
Cylinder bore
  • 3.5 in (89 mm)[1]
  • 4.057 in (103.0 mm)[1]
Piston stroke
  • 3.385 in (86.0 mm)[1]
Cylinder block alloy Cast iron
Cylinder head alloy Cast iron
Valvetrain Overhead valve
Compression ratio
Fuel system Indirect injection
Fuel type Diesel
Oil system Wet sump
Cooling system Water-cooled
Successor Detroit Diesel V8 engine

Oldsmobile produced three versions of a diesel engine between 1978 to 1985: a 5.7 litre V8 1978-85, a 4.3 litre V8 in 1979, and a 4.3 litre V6 1982-1985. The engines all powered rear-wheel drive vehicles; the 4.3 litre V6 was adapted to both transverse and inline front-wheel drive applications. Sales peaked in 1981 at approximately 310,000 units, which represented 60% of the total U.S. passenger vehicle diesel market. However, this success was short-lived due to a decline in gas prices as well as fuel quality issues including large volumes of diesel fuel containing water or foreign particles.[2]

The Oldsmobile diesel subsequently gained a reputation for unreliability and anemic performance that damaged the North American passenger diesel market for the next 30 years.[3][4]

In spite of this, the Oldsmobile diesels' strong blocks continue to see use in gasoline-powered race engines.[2][5]


The LF9 is a 350 cu in (5,737 cc) diesel V8 produced from 1978 to 1985. Earlier versions and those used in pickups produced 120 hp (89 kW) and 220 ft·lbf (300 N·m) torque, while later versions produced 105 hp (78 kW) and 205 ft·lbf (278 N·m) torque.



The LF7 is a 260 cu in (4.3 L) V8 putting out 90 hp (67 kW) and 160 ft·lbf (220 N·m) torque.



The LT6 is 4.3 liter V6 produced from 1982 to 1984 and installed in rear-wheel drive vehicles. Power was rated at 85 bhp (63 kW) @ 3600 rpm and 165 lb·ft (224 N·m) @ 1600 rpm.



The LT7 is a transversely-mounted version of the 4.3 liter V6 produced from 1982 to 1985. Power was rated at 85 bhp (63 kW) @ 3600 rpm and 165 lb·ft (224 N·m) @ 1600 rpm.



The LS2 4.3 liter V6 produced only in 1985 and installed in front wheel drive vehicles.


See also[edit]