BMW S55 Motor Crank Hub Upgrade - Chicane Motorsport

The S55 motor that is in the f80 and f82 M3’s and M4’s as well as the M2 competition is an amazing platform to develop. Unfortunately, with power development, a major design flaw in the crankshaft, timing gear and oil gear design can be encountered. The multi piece design paired with the increased power levels that are easily achievable can lead to the clamping force of the assembly being exceeded. This causes the camshaft timing to fall out of sync with the crackshaft causing piston of valve contact in some cases.

Our solution was developed and tested by MaxPSI who currently holds the ¼ mile record with the S55 motor. This keyed solution eliminates the friction washer design that BMW used to affix the crank hub, timing gear, and oil pump gear to the end of the crankshaft. In conjunction with a keyed timing and oil pump gear the hub itself is pinned to the crank shaft similar to many GM motors.

Don’t be afraid to add power to your S55 motor, contact us and add power worry-free.