Rick360
07-09-2006, 12:26 AM
This is a general question about what is being used with most success in SB2.2 sbc comp elim type engines.
Comparing a typical high RPM SBC Comp Elim type engine with 15* heads and a SB2.2 engine of the same displacement, what is the difference in durations or lobe/cam designs for the different type of heads.
The SB2.2 has much better flow in the mid lift and also the fuel/air discharges into the chamber in a different direction so I expect quite a bit of difference in intake duration, and possibly LSA and exhaust duration. I was told by a well known Comp racer who runs SB2.2 stuff that the cam isn't much different and intake duration in the low 280's @ .050" is what they run (is this bs?). I also heard that WC engines have in the 260's @ .050", (more bs?). The Comp engine was 2x4carbs, but I wanted to know in both cases, 1x4 and 2x4, how the ideal cam compares with the two different type of heads.
I always believed that a better flowing head will run better with shorter duration. 282* @ .050" sounded like too much for that type head. Am I out in left field?
Rick
Comparing a typical high RPM SBC Comp Elim type engine with 15* heads and a SB2.2 engine of the same displacement, what is the difference in durations or lobe/cam designs for the different type of heads.
The SB2.2 has much better flow in the mid lift and also the fuel/air discharges into the chamber in a different direction so I expect quite a bit of difference in intake duration, and possibly LSA and exhaust duration. I was told by a well known Comp racer who runs SB2.2 stuff that the cam isn't much different and intake duration in the low 280's @ .050" is what they run (is this bs?). I also heard that WC engines have in the 260's @ .050", (more bs?). The Comp engine was 2x4carbs, but I wanted to know in both cases, 1x4 and 2x4, how the ideal cam compares with the two different type of heads.
I always believed that a better flowing head will run better with shorter duration. 282* @ .050" sounded like too much for that type head. Am I out in left field?
Rick