Lets see if someone can tell me if they have seen the same trend I have been seeing here.
I am playing with the Desk Dyno and comparing hp and tq on a base 350 sbc.
One cam is a roller with 106 cl, 282/282 @ .50 & 510/520 lift,
Cam 2 is what the desktop dyno calls a Dual purpose flat tappet street, 109 cL, 282/282 @ .50 & 525/499 lift.
Cam one= 380 hp x 307 tq
Cam two= 438 x 354 tq
question is ,, why would the dual purpose street cam outperform the roller cam using the same engine components at 6500 rpm. This is a trend I see in several designs. I would think the roller with faster ramps would out perform the flat tappet. Even at lower rpm's the dual purpose is better . Is it the center lines?
Dave? JimM, Anyone?
I am playing with the Desk Dyno and comparing hp and tq on a base 350 sbc.
One cam is a roller with 106 cl, 282/282 @ .50 & 510/520 lift,
Cam 2 is what the desktop dyno calls a Dual purpose flat tappet street, 109 cL, 282/282 @ .50 & 525/499 lift.
Cam one= 380 hp x 307 tq
Cam two= 438 x 354 tq
question is ,, why would the dual purpose street cam outperform the roller cam using the same engine components at 6500 rpm. This is a trend I see in several designs. I would think the roller with faster ramps would out perform the flat tappet. Even at lower rpm's the dual purpose is better . Is it the center lines?
Dave? JimM, Anyone?