►BMW's S55 engine was a blessing for M fans worldwide. Although it meant the end for its predecessors' high-revving, naturally-aspirated engines, the turbocharged straight-six is an ultra-reliable, overbuilt powerhouse that produces a fat power band in stock form. However, pushing beyond factory output stresses the timing chain drive system. If you want to take advantage of the S55's ability to make significant power, you should look into installing a modified crankshaft hub.

Once you've reached the crank hub and removed it, you can see why it struggles at higher output levels. Rather than a toothed or locked connection to the crankshaft, the crank timing hub uses the friction created on it by the large crankshaft bolt. More power is often enough to spin the crankshaft independently of the hub, causing misfires and poor running at best. No matter how bad the slip is, disassembling the engine to reach it for a fix is always part of the process, so there's no better time to make the switch to an aftermarket hub.

In part two of this three-part DIY, FCP Euro's BMW Expert, Gareth Foley, removes the crank hub, discusses its shortcomings, and installs the upgraded pinned hub from Evolve Motorsports in an F82 M4.

00:00 - Recap
00:12 - Dropping the Subframe
06:38 - Oil Pan Removal
09:18 - Oil Pump Chain Removal
13:46 - Crank Hub Breakdown
17:53 - Drilling The Crank
18:32 - Timing Chain Install
24:32 - Crank Hub Install
31:54 - Oil Pan Install
36:10 - Subframe Install
44:30 - Next Time


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