When adjusting cam gears. Does 0, 0 have more v2v p2v clearance or does -10in and +10ex???
Im reducing overlap= wider center line angle.

 

first this has nothing to do with engine management systems.

second, take a minute or two and understand how a four stroke engine works in its basic form because if you are asking this question, you have no idea how an engine works in its basic form.

You cant make a blanket statement like that regarding V2V and p2v. it doesnt work like that since different engines, different timing events, different valve lift profiles will change how it all works in that aspect.

In general, however, advancing the intake will make it open sooner, correct? traditionally, the intake valve is beginning its opening event off the valve seat as the piston is still traveling upwards towards tdc because it takes time to open the valve. So with a valve that opens sooner and a piston still making its way up, generally speaking that is going to bring P2V closer together right?

Also, since the piston is coming up to TDC, the exhaust valve is still open (on its way to closing) when the intake valve is starting to open (this is overlap). If you open the intake valve sooner, that brings the exhaust and intake valve closer together right? thus making overlap smaller as well as V2V.

so if you retard the intake and advance the exhaust, you are increasing overlap. Advancing the exhaust will make the exhaust valve open sooner but also close later. Same with the intake cam. Understanding that in conjunction with piston position in the bore will give you your answer. This is where degreeing the camshaft comes into play. You know exactly what the valves are doing and you know the position of the crankshaft which can tell you the position of the piston.

Google.