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That graph shows hydraulic flat tappet vs hydraulic roller, it looks a bit different if you compare solid flat tappet vs hydraulic roller.
Mechanical flat tappet is actually faster off the seat up to about .150" lift ....so the mechanical has more area under the curve at low lifts.
Once you are looking at cams with a 3000 rpm and up power range, the hydro roller vs solid flat picture gets very cloudy. Now your getting into upper end rpm high enough you have to start worrying which hydraulic roller lifter to buy so you can rev it above 6000 rpm and not lose control of the valvetrain(float).....whle the solid flat is happily zipping on up to 7500 rpm without a hitch.
Mechanical flat tappet is actually faster off the seat up to about .150" lift ....so the mechanical has more area under the curve at low lifts.
Once you are looking at cams with a 3000 rpm and up power range, the hydro roller vs solid flat picture gets very cloudy. Now your getting into upper end rpm high enough you have to start worrying which hydraulic roller lifter to buy so you can rev it above 6000 rpm and not lose control of the valvetrain(float).....whle the solid flat is happily zipping on up to 7500 rpm without a hitch.
