[BURN-BROS]

The weak area of the 911 crank is the thickness of the throws. 22mm rod width yields a 7mm throw thickness. This is acceptable for the 2.0/2.2/3.0 cranks utilized in high rpm applications. However,when Porsche changed to 24mm width, thy picked up a nasty harmonic above 7500 rpm and destructive @ 8000 rpms.

Also, I spoke to an Formula 1 Engineer that studied the Porsche crank. He stated that the crank did not have sufficient counterweight to offset the weight of the throw by itself. He concluded that due to the boxer layout and the empirical data that this "problem" must not cause harm.