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Yes, that is my intention. If it is infact the bolt that breaks, It would be easy enough to address. Some top notch ARP bolts or the like would likely take care of the problem. If it isn't the bolt and the rod is the problem then that leaves few if any realistic options to fix it.

Ok. I see your point now. Thanks for the explanation.

I think the exact opposite there is much less stress on the whole assembly on the exhaust stroke. The piston is traveling up and the valve is open relieving most of the resistence. Where on the power stroke the the cylinder has just fired causing extreme preasure to be put on the rotating...

That statement is missleading. Rods will bend on the compression/exhaust strokes. They will pull apart/break on the intake/power strokes. It all depends on the stresses in the motor and the condition of the material. Most don't fail all at once. It is from abuse over a period of time. I've...

I think thats the answer. More recipricating weight do to the larger piston.

I wonder what the results would be to put a rod in a press using some THICK wall pipe to simulate the wrist pin and the crank and spread her till she lets go.

I think that is the question to answer. But without a major knowledge in metallurgy or a system to test it, it will remain unanswered. Maybe some one that has had a rod failure can post some pictures and maybe we can see where it is breaking and determine whether its the bolt or the rod itself...

I like your analysis but your missing the part about what the rods and bolts are made out of and what their particular tensile strength is. Also the rods and bolts "stretch" a minut amout with each motion. Also their is the recipricating weight that you touched on with the piston weight that...