Quote:
Originally Posted by Brandoch
It's definitely a challenging diagnosis.
-Bearing clearance too tight
-Super thick oil
-Long crank snout
-2 double timing chains
-2 serpentine belts
-4 bolts on the front of the snout for the crank pulley
-8400 RPM
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100% true. Lots of extreme dynamics are happening all at once.
The S65's MPS is 4200 FPM, hitting a peak of 6770 FPM @ 76*. This represents oscillating between +6770 FPM and 0 every .0035 seconds. This represents an acceleration of over 1,989 Gs.
This means that on average, in acceleration,
the piston alone weighs 2,131 pounds and is likely much higher at peak acceleration.
Because of the magnitude of this force, I am unconvinced that the #1 main bearing issue is the result of the load on the crank pulley and timing chains, even though they are creating a single shear load on the #1.