I am not a cam expert. Just installed them the way somebody who is said to.
From what i understand, retarding the cam tends to perhaps help on the big end, but negatively affects the starting line.
Is that not true ?
Not true. How many rpm does a 4 degree advance move down? 400??
500?
Even at 500 rpm you are so far below converter stall speed it shouldn’t matter.
I’ll say this and I know some will get all wadded up over it but this is what I believe. And that’s that moving the cam ahead to get more “low end” has far less to do with IVC and far more to do with EVO.
That’s why I’ve never understood the de facto 4 degree split. On virtually everything. Does everything need a 4 degree split?
Highly unlikely but Comp was setting the “standard” and that’s what they did. Just like the 110 LSA for so many cams. They did that because the 110 LSA fits far more cores.
That’s why I asked for your numbers. Let’s say you have a 108 LSA and a 104 ICL. If it’s not an off the shelf cam chances are the overlap triangle will be centered, or that’s the same as saying it’s in straight up.
I was running some numbers for my W2 engine. It called for a 111 LSA and a 105 ICL. When I put the numbers into the program I use to see it graphically the cam was straight up even with all that advance.