mr rat patrol,, for you your engine probably wanted the intake valve open longer/later so it didnt like to be advanced. most of the time the intake closing is the "trump" event.

the guy who started this post said earlier,, he wanted to "hit his turbo" harder,, therefore he wanted a wide lobe sep,, when really what he would want is an early exh open, then there is more pressure in the cylinder when the valve is opened therefore charging the turbo with more pressure, but if you do not have enough cylinder pressure to combust fuel effeciently in a short period of time you will loose power in doing so,, but im not a turbo guy..


really all lobe sep does is give you the distance between peak lifts from intake to exh


overlap should be measured at .020 tappet lift for solid rollers,, thats why my example above had an earlier int opening, that the exh closing,, usually its a 2 degree stagger to make up for the difference in ramp rate between them,, exh being slower than the intake. there can be exceptions to this, but its withiin a degree or two dependning on flow characteristics at overlap, port areas, valve sizes...