best rod ratio

alfonso · Post by **alfonso** » Mon Mar 10, 2008 10:07 am

i am new to the math involved to get max hp and tq
looking to buy new pistons and trying to figure how to order
how much compression can i use with w2 heads
what is the ideal rod length for a small block 340 mopar thats 4.125 bore
using 3.31 crank

how do we determine
pin height
ring combo
type of rods i vs h or billet or ti
which will last longest

panic · Post by **panic** » Mon Mar 10, 2008 10:38 am

"what is the ideal rod length"

To do what?

alfonso · Post by **alfonso** » Mon Mar 10, 2008 10:52 am

is a full race motor for off road comp want 14-1 comp
the bore is large and want a light piston so pin height will dictate size of slug
type of ring set
and length of rod
so wondering what to use as far as rod 6 or 6.123 or bigger
and keep hp and tq

Ron C. · Post by **Ron C.** » Mon Mar 10, 2008 11:42 am

Determine where you want your ring package (how far down) determine what pin size and location (pin height). Determine piston/block deck height.

Measure from the center of pin to center of crank rod journal. That will be the relevant optimized rod length. Put the energy and thought into the stuff that will really matter.

That's my experience.............blessings............Ron.

PackardV8 · Post by **PackardV8** » Mon Mar 10, 2008 12:27 pm

Also, try the "Search" function. This issue has been discussed at length several times. FWIW, You will find there is not enough to be gained in either horsepower or torque to spend big bucks on custom parts to vary the rod ratio. Go with what is readily available in the marketplace and save money and brain strain.

thnx, jack vines

rskrause · Post by **rskrause** » Mon Mar 10, 2008 12:29 pm

Definitely try the search function! And don't lose any sleep over rod ratios.

Richard