Posted by Anthony CarboneMarch 13, 2008 at 7:41 am
The new BMW E92 M3 V8 follows BMW’s other M engines, which is to take a small engine and develop power through high RPMs. Torque is ordinary, but the throttle and valvegear is BMW’s usual magic allowing higher RPMs. This engine needs to be wound out to make power.
Type: 90 degree quad-cam four-valve V8.
Size: 4.0 Liters, a nice starting point for the first model year.
Weight:445lbs (202 kgs)
Horsepower: 420 HP at 8,300 RPM.
Torque: Only 295 ft-pounds of torque (400 N-m) at 3,900 RPM
(This V8′s torque is barely 10% more than the old six.)
Redline: 8,300 or 8,400 RPM, depending on where you read it in the press release.
Compression Ratio: 12:1
Unlike the BMW M5 and BMW M6 high-pressure VANOS (variable valve lift and timing) systems, the low-pressure VANOS system of this V8 uses a double (not single) chain to connect the crankshaft and cam sprocket. The cam sprocket connects to the camshaft with a step motor, not helical gearing.
This low-pressure M double-VANOS runs with regular engine oil pressure on the step motor. This eliminates the separate high-pressure system of the V10s.
The intake cam can vary up to 58° and the exhaust cam up to 48° Maximum rate of crank angle adjustment is 360° per second.
Displacement: 3,999 cc.
Bore and Stroke: 3.62″ (92mm) bore x 2.96″ (75.2mm) stroke.
Block: Siliconized Aluminum, no liners.
Valves: 4 per cylinder, 1.38″ and 1.20″ (35 and 30.5mm).
The block comes from BMWs foundry in Landshut (near Munich), where BMW builds the engine blocks for their Formula 1 cars.
It’s made of aluminum silicon alloy. The cylinder walls have hard silicon crystals, not iron liners. The blocks are made with a low-pressure die-casting process from an over-eutectic aluminum alloy, with at least 17 per cent silicon.
Cylinder spacing: 3.86″ (98mm).
Main Bearing diameter: 2.36″ (60mm).
Bearing Width: 1.11″ (28.2mm).
Piston Weight, including pins and rings: 17 oz (481.7g).
Rod weight: 22 oz (623 g).
The throttle valves are not connected to the pedal.
Instead, the pedal is connected to an electronic sensor which talks to the computer.
The computer moves the throttle butterflies electronically as it sees fit.
Oiling: Conventional wet-sump oiling, two oil pumps and two sumps.
(Electronic oil level monitoring, just like my Mercedes for the past 20 years.)
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