[Davec43]

I know obviously the shape. But was reading somewhere that performance wise isn't a huge difference. I understand h beam are stronger but are heavier as well and add more reciprocating mass. Been searching the forums but can't find anything. Thanks

 

[Wolfplace]

I know obviously the shape. But was reading somewhere that performance wise isn't a huge difference. I understand h beam are stronger but are heavier as well and add more reciprocating mass. Been searching the forums but can't find anything. Thanks

=
Actually in a Rat you will find the 6.385 H beam lighter than a stock GM I beam buy about 30 or so grams
As far as strength in the design, it's debatable.
An I beam is inherently a stronger design according to some very smart folks but one of the most respected rods in existence is an H beam, the Carrillo
Oliver on the other hand which is every bit the quality of Carrillo is an I beam,,,
Both are very strong,,, pick your poison

 

[69 Ratt Vette]

Ya, Crower are I beams also

 

[grovey]

tech at manley says i beams are the stronger rod. grovey

 

[Bob West]

I've always heard I beams were stronger

 

[Busted Knuckles]

I'd always heard that an H beam rod was a high RPM rod where an I beam was for higher torque/lower revs application. I've heard from several folks that an Oliver paraolic was the best available at the sportsman racer at around $1300 a set. Sorry to sound ignorant, but what is a parabolic rod?

 

[Wolfplace]

I'd always heard that an H beam rod was a high RPM rod where an I beam was for higher torque/lower revs application. I've heard from several folks that an Oliver paraolic was the best available at the sportsman racer at around $1300 a set. Sorry to sound ignorant, but what is a parabolic rod?

=
Well,,, don't feel like the lone ranger
You just had to ask,,,,,,

But Webster to the rescue & the reference by Oliver is to the shape of the curve in the beam.


parabola ,
plane curve consisting of all points equidistant from a given fixed point (focus) and a given fixed line (directrix). It is the conic section cut by a plane parallel to one of the elements of the cone. The axis of a parabola is the line through the focus perpendicular to the directrix. The vertex is the point at which the axis intersects the curve. The latus rectum is the chord through the focus perpendicular to the axis. Examples of this curve are the path of a projectile and the shape of the cross section of a parallel beam reflector.

There, don't you feel much better now

 

[Bob West]

The latus rectum is the chord through the focus perpendicular to the axis

He typed rectum... I didnt know rods had rectums, now I'm really confused.

 

[Wolfplace]

He typed rectum... I didnt know rods had rectums, now I'm really confused.

=
la•tus rec•tum

Pronunciation: (lā'tus rek'tum), [key]
—pl. la•ter•a rec•taPronunciation: (lā'tur-u rek'tu). [key] Geom.
the chord perpendicular to the principal axis and passing through a focus of an ellipse, parabola, or hyperbola.
=======
Isn't this fun,,,, :clonk:

 

[Tokyo Torquer]

Whether one is stronger than the other depends what they are made of and how much material is there. The aftermarket H-beams were stronger than stock I-beams because they had more material and better steel, at a penalty of weight. The H-beams also do make for easier clearancing in a stroker.

I understand that if the amount of material and the steel is the same, the I-beam will be the stronger rod.

 

[Busted Knuckles]

My dad used to tell me that it was easy to carve a duck out of a block of wood. All you needed to do was remove everything that didn't look like a duck and - presto - you have a duck! That's similar to the statement made by one of the design engineers at Carillo when I asked about the H beam design. They basically started with a good size blank and machined away every part that wasn't necessary for rod strength. Although an H beam starts out as a forging blank similar to an I beam rod, an I beam has it's shape right out of the forge with finish machining consisting of cleaning up beams, etc. On the other hand, an H beam has the cavities machined into the sides of the beams rather than being forged in that shape. I hope this makes some sense. That's one of the reasons I think a good forged I beam is stronger - all of the material is forged into the final shape and contributes to it's strength with grain shape and flow with none of the "grain" structure cut away which seems like it has to weaken the rod. Along those lines, if forged out of the same material, a true forged I beam should also be stronger than a machined billet piece. Straighten me out as needed, this is just the way it's been explained to me, or at least that was my interpretation of what some folks have tried to tell me.

My .02, generally recognized as being worth a bit less than half of that.