Maximum PSI Keyed Crank Hub Kit – S55/N55/N54

$1,299.00

We are proud to release our keyed crank hub kit for the S55, N55, and N54 BMW motors.  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.

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CLICK HERE for Maximum PSI keyed crank hub kit supplemental instructions

********S55 and N55 parts are out of stock until the end of November.  N54 parts are in stock and ready to ship*********

We are proud to release our keyed crank hub kit for the S55, N55, and N54 BMW motors.  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.

The original flawed design allows the timing gear to spin independently from the crank, especially when the motor is modified.  Best case scenario the motor needs to be re-timed with new components.  Worst case, the valves contact the pistons requiring a complete overhaul.   Common symptoms are rough running and camshaft angle deviation faults.  We had this issue several times on our shop F80 M3, one of which required valve replacement.  At that point we had this solution machined, and we installed it in our car and a few other test cars last year.  We went from a failure at each event to setting new records at the track and on the dyno.  We have now achieved a best 1/4 mile time of 9.4@149mph, and we just recently made 850+whp on our Dynojet on E85 fuel.

 

 

Choose Motor:

S55, N55, N54