Originally Posted by
Hemituna
...however if you advance the intake 5 degs, logic dictates that the exhaust advances 5 degs too.
The confusing part is that the cam lobe centreline NUMBERS which go in opposite directions. This is because of the way this is measured relative to TDC.
Take for example a stock 6.4L or Hellcat cam. Both have 120.5 LSA. When at 120.5 ICL, this cam is "straight up"...neither advanced or retarded, both lobes are at 120.5 CL
Advance the cam 5 degrees, and Intake CL is now 115.5 degs, while exhaust is 125.5 degs...seems strange and takes a while to get your head around it.
That is why at idle when it is fully advanced it will show exhaust 134ish (120.5 +14) and intake 106.5ish (120.5 -14)
..