... just curious... what's the difference between the two (h-beam vs i-beam)...

 

It really depends. If you are just sitting there looking forward, they are H beams. Once you swivel your head 90 degrees either direction, then they become I beams.

 

The Crower and Honda rods are I-beam, the Eagle is H.

 

don't quote me on this, but I always thought it was because the top of crowers/hondas flared the top ring out to create a I-shape...and the eagles dont flare leaving the shaft of the rod straight and thus looking like an H...

 

...good one... ...anyways, are there any advantages to running one or the other?? ...i searched on here and i thought that one was better for high rpm's... correct me if i'm wrong... thanks...

 

I think an H-beam design will have a slightly lower mass moment of inertia since the mass is concentrated nearer the centerline of the rod. THis would make it better for high RPM. However for rod buckling which I imagine is the failure mode for high-high cylinder pressures (like in FI) the material should be concentrated away from the buckling axis. Most likely bucking/bending would occur about an axis parallel to the crank since in the other direction the end conditions are "fixed" ( ie not allowed to rotate).

 

So basically H beam is good for your 10k rpm n/a motor, I beam is good for your 30psi terbod motor... unless I've got it wrong?