cam duration and installation settings

[NoHachi]

What Wouter is referring to is a degree wheel. Type it into google and print what you find onto a piece of paper.



Basically what you do is mount the degree wheel someway onto your crank. Set the engine at TDC and rotate the degree wheel so an indicator (make one yourself..use a bolt or something) points at zero degrees. Then you start rotating the crank an at the same time measuring the amount of lift at the cyl#1 valves..You do this with some stepsize..preferably individual degrees.
What you end up with is a graph of degrees at crank VS lift. Duration is the number of degrees between opening of a valve and closing of that same valve.

Basically..its not that easy to measure. You need at least to fab up a degree wheel and also some kind of structure to mount a micrometer on top of the valvestem.