Home » Racing Engines » GM Northstar L47 Oldsmobile Aurora
Specifications
GM Northstar L47 Oldsmobile Aurora, 4 stroke, methanol engine
Introduced in 1995
3992cc
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Dimensions
Cylinders arrangement: V8 (90o)
Strokes: 4
Bore x Stroke: 93.0 x 73.456 mm
Capacity: 3992 cc
Compression ratio: 13.0:1
Construction materials
aluminium block 205.7mm height, 102mm bore spacing, aluminium alloy head
cross plane crankshaft with 5 main bearings
connecting rod distance center to center 138.684mm or 134.62mm
Cylinder-head
crossflow design
2 overhead camshafts per bank (DOHC), chain driven, 4 valves / cylinder - 32 valves total
33 mm intakes and 29 mm exhausts valves diameter
intake valves are inclined at 25°, exhaust valves are canted to 7°
Aspiration
Νatural with Bosch multipoint electronic Fuel Injection
2 x IHI or Garrett Turbochargers with Secan air-to-air Intercooler
LMP: 2 x 32.4mm turbo restrictors
Ignition
ECUFiring system. Firing order 1-2-7-3-4-5-6-8
Source
Source
Cooling and lubrication
water cooled
Dry sump with oil to water heat exchanger (oil tank in front of engine)
Torque values
Models used and Output
| Year | Model | Induction | Compression ratio | Power | Torque |
|---|---|---|---|---|---|
| 1996 | Riley Scott Mk III | MPFI | 13.0:1 | 660 HP / 10700 rpm | |
| 2000 | Cadillac Northstar LMP | MPFI+2 IHI turbo | 575 bhp / 429 KW @ 7200 rpm | 650 Nm / 480 ft lbs @ 6000 rpm | |
| 2001 | Cadillac Northstar LMP | MPFI+2 IHI turbo | 600 bhp / 448 KW @ 7500 rpm | 673 Nm / 497 ft lbs | |
| 2002 | Cadillac Northstar LMP-02 | MPFI+2 Garrett turbo | 600 bhp / 448 KW @ 7500 rpm | 746 Nm @ 5500 rpm |
SourceLMP twin turbo version
Source