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377_035
Engine mechanicals
Crankshaft
The crankshaft runs on five bearings and is made of
high-alloy tempering steel (42CrMoS4). It is 90°
cranked and has no conrod journal offset.
The vibration damper is a vulcanised single-mass
damper with unbalance.
– Main bearing: Ø 65 mm
– Main bearing width: 18.5 mm
– Big-end bearing: Ø 54 mm
– Big-end bearing width: 15.25 mm
Modifications to high-revving engine
At the very high engine speeds, axial vibration
occurs due to the unbalance in the single-mass
damper. This can cause the crankshaft to break.
To avoid this vibration, a dual-mass damper without
unbalance is employed in the high-revving engine.
To compensate for unwanted engine vibration,
heavy metal inserts are integrated in the first and
eighth crank webs by way of unbalance.
Heavy metal inserts
Cranktrain in the RS4
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