formula to calculate the max lift when using ratio rockers.
08-31-2007, 12:15 AM
#2
4th Gear Member
Thread Starter
Join Date: Jun 2006
Location:
Posts: 1,198
RE: formula to calculate the max lift when using ratio rockers.
got it nevermind, here if anyone else will need it.
Rearranging the equation a bit gives us the means of figuring our gross valve lift with the new rocker ratio:
Valve lift/Rocker Ratio = Lobe Lift
Plugging in the numbers for our current cam and rocker ratio gives us .500/1.5, which equals .333" of lobe lift.Rearranging the equation a bit gives us the means of figuring our gross valve lift with the new rocker ratio:
Lobe Lift X Rocker Ratio = Valve Lift
Inserting the specs for our cam and prospective rockers gives us .333 X 1.6, which equals .534" -a substantial difference in lift. Note that a lot of guys like to say "switching to a 1.6 from a 1.5 gives .030" more lift!" -this is true in some cases, but as this number is a ratio, not a constant, it is unwise to assume that the lift increase will be any set number -do the math, record the numbers, and verify that you have clearance, and you'll never have to guess or worry about putting a valve through your brand new forged racing pistons!
Thread
Thread Starter
Forum
Replies
Last Post
musnicki
Classic Mustang General Discussion
8
09-23-2015 07:11 AM
uberstang1
Classic Mustangs (Tech)
6
09-20-2015 06:42 PM
