Originally Posted by doctercookie
would using a heavey valve spring and a light main spring be good or bad? and could haveing your IVG screwed all the way in a big problem with effeciency?
If you are using a heavy valve spring you should have a shorter dwell time (time the valve is open to let the air push the ball out). But, if having to crank the IVG in all the way with a light spring is the only way to achieve velocity then you need a lighter valve spring. There is a balance between the two springs and your regulator to get best efficiency.