If you have broken or seen a broken birf, and inspected the cup, were there typical wear marks in the ball channels? Any other signs of wear? How much mileage on the birf? Tire size? Extreme gearing or power?
I'm investigating a theory that the birfields are more prone to breakage when worn. This was brought up in a recent thread, and after searching I can't find a whole lot of the specific info I crave. The theory is that the balls get stuck in the wear marks when turning under power, and something has to give. The other theory is that the birfield is weak and can explode at any time. For my purposes I will personally discount cases of birfs breaking due to seriously increased stress, i.e; tires over 37", high horsepower powerplants, and/or extremely low gear ratios in t-case or axle, but I'd still like to hear about them.
-Spike
I'm investigating a theory that the birfields are more prone to breakage when worn. This was brought up in a recent thread, and after searching I can't find a whole lot of the specific info I crave. The theory is that the balls get stuck in the wear marks when turning under power, and something has to give. The other theory is that the birfield is weak and can explode at any time. For my purposes I will personally discount cases of birfs breaking due to seriously increased stress, i.e; tires over 37", high horsepower powerplants, and/or extremely low gear ratios in t-case or axle, but I'd still like to hear about them.
-Spike