Originally posted by Top Gun 777
...........In induction we always talk about when it opens and when it closes ( duration can be calculated or measured).
So , do you advanced in opening or closing? What power band you want to have from your engine?
In general terms, what performance change do you enhance if you increase induction by advancing opening or retarding closing of the crank opening.
I.E. advancing opening = more torque
retarding closing = more top end
Or is it the opposite.
Same way with transfer ports, what effect does it have to rise the port or lower it.
AFM