So performance i beam rods are typically made of a higher grade of steel 4340 or 300m and often have a thicker cross section in critical areas to increase strength.
H beam rods vs i beam rods.
With an h beam rod you should look at the thickness of the blades.
Basically the h beam itself where the slot is cut out.
I beam or h beam.
Conversely h beam connecting rods are a little bit stiffer and rigid and that makes them ideal for higher horsepower higher torque applications where there is going to be more compressive forces again this comparison only holds true if your comparing rods with the same material finish and length.
Depending on the material you would want at least 900 inch of thickness in that area.
This design makes these rods more rigid and able to handle compression forces.
H beam rods are more difficult to machine so they are often more expensive.
H beam connecting rods incorporate two large flat sides with a thin section in the middle.
H beam rods have a completely different design.
Pauter rods are neither i or h beam they are a cross or x shape but im only concerned with i and h from what i know and im still learning i beam rods are lighter and stronger than h beams.
An h beam rod has two large flat sides that are perpendicular to the piston pin and crankshaft journal with a thin center.