Re: Cowl induction benefits
I would say by the way my 3 pieces of ribbon were pulled flat to the screen at full throttle.And this was from 4000 to 5600 rpm.The air is drawn faster than its breeze.(A able to pull by demand type system)Makes sense there is a good amount of air being inhaled by a 396 turning higher rpms.With my K&N filter there is a lot of intake noise as well when that door opens.And the dynomax super turbo mufflers/and headers are just right to still hear plenty of intake noise.A side note the vac door is not as active on my auto as a 4 speed.Unless i force the engine to bog before a down shift.So durring my ribbon test that door was about a 1/4 way open
Two things greatly control the action of the top cowl hood flapper:
The one way check valve hooked up to the vacuum which opens the flapper door and allows it to close slowly. If you get rid of that one way check valve, then, the door opens quickly and closes quickly.
In addition, there is a piece that rests on the vacuum canister that is connected by one screw to the flapper. If you adjust the tension of this one screw and the orientation of the piece on the vacuum can (forward or back), you can adjust the action and opening and closing clearances of the flapper.
1970 Chevelle SS396 (408), Fathom Blue,
Original Block & Forged Crank, KB Pistons, Edelbrock 6045 Heads,Comp Cam 292H, March Serpentine, RPM AirGap,750HP,100hp Nitrous
A/F Wideband,Tremec TKO 600, 12 bolt,
30 spline Moser Axles, Richmond 3:73's, Hotchkis control arms, swaybars, springs, Wilwood 12" rotors D/S, 4 piston calipers