GM Northstar L47 Oldsmobile Aurora (1995)

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GM Northstar L47 Oldsmobile Aurora, 4 stroke, methanol engine
Introduced in 1995
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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


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°


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


Firing system. Firing order 1-2-7-3-4-5-6-8
northstar_PCM_ECM.gif Source
northstar_firing_order.gif 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
lmp-engine.jpg Source
LMP twin turbo version
7019374683_cb88836d52_b.jpg Source
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