WPC is NOT a coating. It's a similar (better) process to shot peening where they use a much finer proprietary media at a higher velocity to normalize, smoothen, and strengthen the metal. The finish that wpc gives a part will go away from metal to metal contact but it will not effect or change the added strength unless you are wearing down the metal significantly.Yes, I've broken a few 2nd & 3rd gears, not to mention a ring and pinion. Always managed shaved most the teeth off of whatever every time.
Its a balance of Torq, Clutch, Grip and even Motor Mounts that either keeps a gearbox intact to something gives.
Too much clutch applied wrong, not enough motor mount to hold the impact, too much grip, too much boost that comes on with torq, 2nd and 3rd gear are the issues. Constant pounding when all else is right becomes a ring and pinion issue.
Coatings help, but they change the specs and eventually it wears a way anyway, clearances change and in the end, means nothing.
I have WPC'd 2nd, 3rd, 4th and the ring and pinon, including my OS 4.40. When you take them a part, they all look great...in the places that don't wear. The places they do, they are right back to wearing on the materiel that was there to begin with and any coating you put on is gone. If anything, you need to harden the pieces, shot preening for an example.... but in the end, to hard, they become brittle and break anyway due to heat, age and fatigue.
Its a balance of torque, clutch, grip and how it hooks up, where the shock goes and how that shock is supported. Get it wrong and something breaks. Every situation is different and needs to be supported differently.
Its as simple as that, Life is a balance, so are gearboxes .....
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Just to name a few
This is 3 different occasions.
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Two more for the hell of it that made me cringe
Didn't you break most of your gears with solid mounts? Having too stiff of a mount is probably worse than running stock.