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By looking at the other end of the rod that isn't still attached to the crankshaft. It's not a sure thing, as stuff often get's smashed around. I have a bag of pieces somewhere of a "powder cast, pressure forged, fracture split" type rod that shattered into 20-30 pieces when a customer went...

It's not the pressure in the cylinder that breaks the rod, it's the force of it being thrust upwards with little resistance, the coming to a complete stop. If you take a rope and attach a brick to the end and drop it off a building, then two bricks, then three bricks, then four....etc...

I don't have any "proof", just what I've seen over the years. Yes, they can certainly crack or bend on the power stroke, but how many have you seen in your experience in any engine that broke on the power stroke? What I was getting at, is that in this situation if you have two motors that are...

ASE master tech with L1. Been turning wrenches professionally for quite some time. Though I will say I am not a diesel mechanic. Think about it for a second, all things being equal if you are making enough power to break a rod on the power stroke, you would have already smashed the aluminum...

Rods in general normally break on the exhaust stroke, even the ones that look like they were bent or crushed on the power stroke. Like a baseball pitcher throwing out his elbow, a heavier piston would lower the threshold at which the rod can reverse the direction of the piston.