CB265-6001 – S65 4.2L Engine Rebuild

Connecting rod bearing and valve springs are common failure items on S65 and S85 engines. In response, CarBahn Autoworks has developed improved bearings and valve springs. This rebuild includes a valve job with new hydraulic lifters, plus timing chains, timing chain guides, timing chain tensioners and all associated seals and gaskets.

History

Steve Dinan has been building high performance and racing engines for BMW s since 1977, winning 11 racing championships including 3 prototype championships and two 24 Hours of Daytona. The same engine shop that builds the racing engines also builds the street car engines; these talented engineers, machinists, and builders have built hundreds of engines from OEM street rebuilds to full-blown racing engines.

Refer to the graphs below for the power results without catalytic converters on 100 octane race gas and using J607 (the typical aftermarket correction).

S65 4.2L Wet sump:

RPM	TRQ	HP
3500	329.4	219.5
4000	346.8	264.1
4500	348.2	298.3
5000	339.4	323.1
5500	340.6	356.7
5800	340.3	375.8
6000	334.2	381.8
6500	331.6	410.4
7000	329.8	439.6
7500	317.0	452.7
8000	309.3	471.1

No cats, 100 octane unleaded, J607