Just a couple more thoughts to those interested:
In two of my earlier posts I gave G-Force Calculations.
Most Connecting Rod companies only rate their engines via HP.
Ask them what the Con Rod is rated too for RPM.
In most cases you won't get an answer..lol
The HP rating is a guideline, RPM and G-Forces should play more of a factor I would
think. RPM, piston and con rod weight, along with crankshaft stroke are the biggest
determining factors when the con rod is working in tension.
As the calculations I provided earlier will show:
Crankshaft stroke will determine piston acceleration and speed
along with engine RPM.
Piston weight also adds into the equation, especially with
a piston that is going to be used in a boosted application
as they must be more rugged.
Connecting rod bolts should be evaluated only in tension,
not in compression, so HP ratings have no relevance to
con rod bolts, as the cylinder pressure related to HP
is only a concern when the rod is in compression.
But they are greatly impacted in tension, which includes
the weight of the piston, pins and connecting rods.
Generally speaking, everything being equal, an I-Beam
will be stronger than an H-Beam at equal weights because
the I-Beam design provides for a stiffer 'Beam'!
-everything being the same-
To get an equal stiffness, one must run a 'Heavier' H-Beam rod.
Also, when comparing a broken or bent I-Beam against
and H-Beam, it is best to 'Also' know several things.
1) is the material the same?
2) is the engine size and stroke the same?
3) is the hp rating the same?
4) was the rpm the same?
So even a picture does not tell one the entire story
relevant to a broken or bent con rod...
Most of the products that are 'Bandied' around are made overseas
and purchased by people who own large groups of auto parts
The above has become more prevalent over the last few years
as many companies have been sold to this group of investors.
So 'Real' race parts / components are not as easy to find
or purchase anymore (JMHO)!
It is to the point here in the USA where it is very difficult
to determine what quality one is buying, versus what the
cost should be for that product.