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-   -   sealing scoop to carb. (https://www.racingjunk.com/forums/showthread.php?t=19902)

jerryms 02-19-2008 04:06 PM

sealing scoop to carb.
 
is there big gains sealing the scoop to the carb? curently running 388 sbc vega 2300lbs [email protected] the scoop is wide open on the bottom.

OneBadGMC 02-19-2008 04:27 PM

If it's unsealed, not really much use in having it, is there?

The whole idea is to get some 'natural' supercharging going on by ramming air into the carb.

Right now, all you have is a big parachute on the hood.

bjuice 02-19-2008 04:38 PM

I have a 6 inch outlaw hood on my 67 camaro and i used foam that i cut out about 6 inches in the deeper parts and 4 inches elsewhere,,used some good emblem glue and get-er-done..

the cowl hood is designed to pull air down from the winshield across top of the motor..you need to channel the air to your carb..the foam or whatever you use will also help create a barrier from the carb sucking down the hot air from exhaust etcc..


a snorkle type scoop i would seal up 100 %..( i did on my vette)

yes it helps

lively 02-19-2008 04:45 PM

SEAL IT---ENGINE HOT AIR ISN'T GOOD 8) 8) 8) AND LIKE IT WAS SAID -WHY PUT A PARACHUTE ON THE FRONT :oops: :oops: ---DENNIS

johnracer 02-19-2008 04:56 PM

In my opinion, big gains, no. But it's worth it anyway. When I first started sealing the scoop, I didn't pick up at all, but consistency definately improved. I assume because the engine wasn't getting hot air from under the hood....

bjuice 02-19-2008 05:38 PM

here is a pic of the insulator pan i made for my 632ci...notice the escap holes on the duck tail out the back this keeps the scoop from blowing apart with 180 mph winds channling thru the scoop.

next pic is the entrance of the scoop..

[img]http://i210.photobucket.com/albums/b...n/100_0368.jpg[/img]




[img]http://i210.photobucket.com/albums/b...n/100_0367.jpg[/img]

sds10racer 02-19-2008 09:29 PM

hey bjuice, is that a diverter? in front of the carb on the front inside of the scoop? does it help smooth the flow to the carbs?

bjuice 02-20-2008 08:18 AM

yes ..that's what it is..a RAMP that feeds and diverts the air too the carbs creating a forced induction type situation...there has been some heavy reported gains in HP with the proper insulators pan set up..

same watered down version of how a blow thru supercharger works.
not to mention the isolation of engine heat from carbs.

edvancedengines 02-20-2008 01:48 PM

I have a customer that was not running his scoop sealed and the insides on his engine was trashy every time I tore it down. I Finally made them seal the hood scoop. Bammo, next tear down engine was fairly clean. I have one now that refuses to use a hood scoop at all with an injected EFI engine. We will see what happens there.

It is my theory that a good hood scoop increases ambient atmospheric pressure levels.

Ed

sds10racer 02-20-2008 09:25 PM

on my s10 i took the head lites out and made a ram air system for it . which is actually better, hood scoop or ram air?


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