Quote:
Originally Posted by F87source
The n55 crank hub can and has failed before, however it is not as common as on the S55 for a few reasons:
1) Much less power than an S55
2) alot less mass on the crank hub and thus less inertia that the friction disc must over come when rpms increase due to WOT or down shifts. This is because the s55 has a mechanical water pump driven off of the crank hub wheras the n55 has an electric water pump, also the s55 has 2 HPFPs driven off the vaccum pump which is driven off of the cam which is again tied to the crank hub.
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1) Torque. Power is an estimate of how much you could do with same based on how fast the engine is spinning and the use of gearing. Just saying.
2) Interesting point. The alternator will drag, but the belt - should - slip before the crank pulley moves...