No peak lift has nothing to do with it.
Take a 108* intake centerline, 3.543" stroke, and a factory 5.933 rod.
The piston will be down the bore 2.561", while the valve is open .500"-.600".
So how is that going to hit?
Just for sake of argument let's take a camshaft with .500, or even .600" of peak lift.
Now take the factory 4.6L stroke of 3.543". Why would anyone want to open up the valve all the way (.500"-.600"), when the piston is at TDC?
The pressure differential and volume are next to nill.
Also,
do not think one 112* LSA is the same as another 112* LSA (same with duration) and that they will act the same.
So how does one figure out the LSA?
If you know the
Intake Centerline (ICL) and the
Exhaust Centerline (ECL), you can add them together and divide by 2, as follows:
Say you have a 107 ICL and a 117 ECL.
(107+117)/2 =112 LSA.
Keep in mind, that a LSA of 112 does not mean the camshaft will act the same as another camshaft with a LSA of 112. The LSA is determined by different valve opening and closing events, figuring out the ICL and ECL from them, and doing the above math. I will use two typical camshafts below, to show how you cannot compare a camshaft based on the LSA alone. It is just a little piece in the design of a camshaft.
The Ford Racing Z303 camshaft has the following valve events at .050":
Intake Opening: 7* BTDC
Intake Closing: 41* ABDC
Exhaust Opening: 51* BBDC
Exhaust Closing: 3* BTDC
IO+IC+One Stroke = Duration for Intake @ .050"
or 7+41+180 = 228*.
EO+EC+One Stroke = Duration for Exhaust @ .050"
or 51-3+180 = 228*.
Now find the ICL and ECL.
Intake Centerline is found by: (Intake Duration/2) - IO BTDC. In other words...
228/2 = 114. 114-7 =
107* ICL.
Exhaust Centerline is found by: Exhaust Duration/2 + EC BTDC. In other words...
228/2 = 114. 114+3 =
117* ECL.
107+117 = 224/2 =
112* LSA.
Now quickly, one can do this for the Lunati 51014 camshaft. It has the following valve timing specs at .050" and a LSA of 112, like the Z303 camshaft:
Intake Opening: 1* BTDC
Intake Closing: 37* ABDC
Exhaust Opening: 49* BBDC
Exhaust Closing: -3* ATDC
Intake Duration is 1+37+180 = 218*. The ICL is (218/2)-1 =
108*.
Exhaust Duration is 49-3+180 = 226*. The ECL is (226/2)+3 =
116*.
LSA = (108+116)/2 =
112* LSA.
Now you see that both, the Z303 and the Lunati camshaft have the same LSA, but different individual valve events and ICL/ECL figures. So how can a camshaft with the same LSA, act the same, or idle at a particular level?
It cannot because of many different factors and an
endless amount of possibilities.