Connecting Rod - Audi 4.2-liter V8 FSI Service Training

Connecting Rod

Cracked connecting rods made of 36MnVS4 are
used in the basic engine, while the conventionally
split connecting rods in the RS4 engine are made of
34CrNiMo8, for strength.
In addition, the geometry and tolerances of the
connecting rods were reduced on the high revving
version of the 4.2L V8 FSI engine.
– Bearing journals diameter:
– Bearing bushings:
– Length of bushing:
– Connecting rod length:
Cracking
During the cracking process, the connecting rod is split
at a predetermined breaking point using a special tool.
The resultant unique breaking surface ensures the high
joining precision of the two mating parts.
Piston
For strength reasons, forged pistons with a slightly higher
weight than conventional pistons, are used. Both engines
have the same piston geometry.
– Piston weight
without rings: approximately 290 g (10 oz)
– Piston pin: 0.20 mm x 0.11.5 mm x 40 mm
54 mm
1.4 mm thick,
15.25 mm wide
0.20 mm diameter rolled
154 mm
Engine Mechanical
Breaking surface
Predetermined
breaking point
377_058
377_062
377_057
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