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  #16 (permalink)  
Old 09-27-2012, 03:48 PM
malc's Avatar
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The other problem about cowl hoods that are not sealed to the intake is they act like para shoots at speed! once the air pressure under the hood is greater then the pressure entering the scoop and over powers the scoop openings ability to exhaust this extra pressure your front end begins to lift !!!!
This is the underside of my hood, the filter fits pretty tight.
Ive hung paper on the cowl inlet and air goes in there at all speeds, the paper gets sucked to the cowl.



Im pretty happy with my setup, its taken awhile to get to where it is.
I forgot to say in my previous post adding a spacer to the Performer Airgap helps by adding plenum volume and giving both sides of the motor access to the carb.

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  #17 (permalink)  
Old 09-27-2012, 06:55 PM
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Quote:
Originally Posted by malc View Post
The other problem about cowl hoods that are not sealed to the intake is they act like para shoots at speed! once the air pressure under the hood is greater then the pressure entering the scoop and over powers the scoop openings ability to exhaust this extra pressure your front end begins to lift !!!!
This is the underside of my hood, the filter fits pretty tight.
Ive hung paper on the cowl inlet and air goes in there at all speeds, the paper gets sucked to the cowl.



Im pretty happy with my setup, its taken awhile to get to where it is.
I forgot to say in my previous post adding a spacer to the Performer Airgap helps by adding plenum volume and giving both sides of the motor access to the carb.
Sorry I wasn't implying your scoop wasn't sealed I hope it didn't read like that!

I used to use knitting yarn To Find placement of front facing scoops I taped it to the front of the hood and and on doll rods that came above the hood 1' high and 2' high as speed picked up the yarn would follow the air flow over the body! and you could see ware to place the scoop!

I forget about the open spacer giving cylinders access to full cfm from both sides of the carb on a true dual plane without being notched in the devider ( I just posted that the other day and forgot to include it here) thanks for pointing that out! LOL Thats what happens when you age a little

Jester
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Old 09-27-2012, 09:11 PM
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Just something to think about before you add a 2" spacer. All the dyno sheets, and subjective testing I have seen says you will loose HP with a air-gap and spacer. Including top end HP where they are supposed to help.
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