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Old 01-30-2015, 03:47 PM   #1
Jim Caughlin
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Default Re: Cowl Hood vs Snorkel Scoop

Anything less than 2" top of carb to bottom of scoop clearance will affect performance, this has been proven on dynos.

In my case, just removing the seal between the carb and the front facing hoodscoop slows the car by almost a tenth.

In the case of Stockers that have cowl hoods, they have been proven to have zero performance gain over a flat hood even when the carb is sealed to the scoop. They effectively are no more than a carb cover.

I don't care for the looks of front opening snorkel hoodscoops but there is no question that they are the best for performance.

Jim Caughlin
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Old 03-01-2015, 10:37 PM   #2
Eric Crawford
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Default Re: Cowl Hood vs Snorkel Scoop

Quote:
Originally Posted by Jim Caughlin View Post
Anything less than 2" top of carb to bottom of scoop clearance will affect performance, this has been proven on dynos.

In my case, just removing the seal between the carb and the front facing hoodscoop slows the car by almost a tenth.

In the case of Stockers that have cowl hoods, they have been proven to have zero performance gain over a flat hood even when the carb is sealed to the scoop. They effectively are no more than a carb cover.

I don't care for the looks of front opening snorkel hoodscoops but there is no question that they are the best for performance.

Jim Caughlin
SS 6019
That's good to know. I was thinking of putting the air pan back on my car when it gets back together. (Cowl hood) I may not even worry about it now.
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Old 07-28-2015, 10:00 AM   #3
oneowner73
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Default Re: Cowl Hood vs Snorkel Scoop

If your cowl extends very close to your windshield you will be in a high pressure area created by the air turning up the windshield. Changing directions causes resistance creating pressure. If your cowl is too far from the windshield it works like a draw tube like header evac systems. I went from no air box with my 6" cowl to an unsealed box and ran the same et and 1 mph faster in 1000' worse air in the 1/8 mile.
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