Rocker Arm Ratio

[Bill Diehl]

Originally Posted by Alan Roehrich

Because it is not maximum lift that matters. It is how fast you accelerate the valve, and how much area under the curve you generate.

Exactly.

but that's not how its spelled out in the book, it says lift...some have an advantage with lifter dia. which accomplishes the same thing.

So, are they measuring lifter dia. or are the .842 guys using .875 and larger stuff?

[Doug McCue]

Originally Posted by Bill Diehl

Exactly.

but that's not how its spelled out in the book, it says lift...some have an advantage with lifter dia. which accomplishes the same thing.

So, are they measuring lifter dia. or are the .842 guys using .875 and larger stuff?

During a tear down are lifter diameters measured?

[Aubrey N Bruneau]

I use 1.7 ratio in an engine that calls for 1.75. The difference has been made up through the cam lobe. Lift at valve checks about .007" under my max allowed.
I have twice asked NHRA about this. As mentioned, they're concern was higher ratio rocker, and of course the actual lift measured at the valve.

just my experience... which is limited