So the lobe lift should be around .308" on the intake side.
.308" x 1.6 = .493"
The lobe lift should be around .320" on the exhaust side.
.320" x 1.6 = .512"
Try not to judge the lobe seperation angle by the LSA.
There are many factors that can effect the idle characteristics.
- Idle Speed
- Tune
- Induction
- Exhaust style/type/size
- Etc.
Besides, the LSA can be figured in many different ways.
5+5 = 10
7+3 = 10
Average them both, and you get the same average of 5, but yet there are two different ways to get the 5 average. Pretend 5 is the LSA. So...
Take the Z303 camshaft with an intake opening at 7* BTDC and an intake closing at 41* ABDC.
7+41+180 = 228* (duration). Divide that by 2 and you get 114*. Subtract the intake opening BTDC and you get 107* on the intake side for the intake centerline.
Now go to the exhaust side...
Exhaust Opening is:
Exhaust Opening: 51* BBDC
Exhaust Closing: 3* BTDC
51-3 = 48. 180 + 48 = 228/2 = 114*. 114* + 3* = 117*
So take the intake centerline and the exhaust centerline for each lobe.
107 + 117 = 224/2 =
112 LSA for the Z303 camshaft.
Take a completely different camshaft, the B303 with events of:
Intake Opening: 5* BTDC
Intake Closing: 39* ABDC
Exhaust Opening: 49* BBDC
Exhaust Closing: 5* BTDC
It has an
LSA of 112* as well.
But, both of them have completely different valve events. The camshafts will behave quite differently.
dont expect to get much out of them if you haven't bought from them. BTW I got my cam through them and am very happy.
