backwards scoops
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backwards scoops

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    Member swamprat9's Avatar
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    Default backwards scoops

    ok,I have been wondering why alot of people have the scoops on the carb turned backwards(facing the back of the boat).You would think with it turned backwards it is defeating the purpose or am I missing something?

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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by swamprat9 View Post
    ok,I have been wondering why alot of people have the scoops on the carb turned backwards(facing the back of the boat).You would think with it turned backwards it is defeating the purpose or am I missing something?
    The chevrolet engineers may have been onto something with the cowl hood. I bet it makes little difference either way.
    Another Hot Boat refugee

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    Senior Member SoldHondaBoughtHondo's Avatar
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    As long as you can keep the water out.
    Last edited by SoldHondaBoughtHondo; 05-26-2011 at 07:41 PM.
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    Senior Member ICECREAMAN's Avatar
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    If you don't have a spark arrester on the carb, you can't run it facing the seating area per coast guard . If the motor backfires the people in the back seat get real short hair quick.Also spray over the bow can go straight into the carb.

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    Senior Member jetboatperformance's Avatar
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    Water doesn't "compress" (air fuel mixture does) if your engine inadvertantly takes a "big gulp" of H20 eg a wave over the bow or?? its very likley a catastrophy of mangled rods , pistons and maybe block iron will occur I ran it backward on my cruiser to reduce the noise but personally I run them forward for the most part Tom

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    Member swamprat9's Avatar
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    good deal,knew there was some reason I wasn't thinking of.

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    Quote Originally Posted by H20MOFO View Post
    The chevrolet engineers may have been onto something with the cowl hood. I bet it makes little difference either way.
    The chevrolet engineers determined in the area where the hood ends and the windshield began there was a high pressure area so cowel induction was born. In truth you are correct as other than getting relatively cool dense air compared to hot under hood air there was little benefit in the location itself outside of marketing.

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    Quote Originally Posted by fastmarlene View Post
    The chevrolet engineers determined in the area where the hood ends and the windshield began there was a high pressure area so cowel induction was born. In truth you are correct as other than getting relatively cool dense air compared to hot under hood air there was little benefit in the location itself outside of marketing.
    It was the NASCAR people that 1st used cowl induction. Since the rules dictated that they had to keep everything under the stock hood the air was ducted to the air filter from the cowl grill below the windshield. This idea goes back to 1962 or 63.
    Within the heart of every stray lies the singular desire to be loved. "Good grief you're an irritating blowhard...." [Tex 6/16/11]

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    ...eliminates water ingestion and long hair incidents, there is a LOW pressure area created, which feeds a high-volume, of "clean" air to the carb, reduces noise, and I think it looks/integrates better on the engine hatch...not sure on the spark arrestor comment tho...

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    The Man cordog009's Avatar
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    Wouldn't a scoop turned backwards almost create a vacuum on top of the carb, with the air passing around the scoop? I don't really see how it couldn't.


    1984 Youngblood TX-19 SOLD

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    Senior Member ol guy's Avatar
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    There are 2 theories on this and they both have been covered! It started with the circle boats that get water splashed at them all the time and grew to just keeping the solid (water) out of the motor. An ingestion of water can turn a rod into a shoehorn in a heart-beat. A lady,girl or long hair guy sitting in the back seat can get a major headache just as fast. The air moving around the scoop plays funny games and can actually hamper air flow into the carb. Look at velocity stacks. if you have ever ran one or do, make a good pass and shut down asap then run you're finger around the bell of the stack. That moisture you feel is the air being sucked back out of the carb. If you don't believe me---Taste it. M

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    Senior Member Alter Ego's Avatar
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    i used to have a 4 inch cowl induction hood one a camaro, of mine. If there were any pollen or rain water beads on the hood, it would oll up the hood and SHOOT into the cowl induction . i can see where there would be just as much power as a scoop facing forward, plus you can reep the benefits of everything else everyone has already mentioned.

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    The Man cordog009's Avatar
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    Quote Originally Posted by Alter Ego View Post
    i used to have a 4 inch cowl induction hood one a camaro, of mine. If there were any pollen or rain water beads on the hood, it would oll up the hood and SHOOT into the cowl induction . i can see where there would be just as much power as a scoop facing forward, plus you can reep the benefits of everything else everyone has already mentioned.
    Only thing is that with the cowl induction hood, I had a 3" on a 02 Z28, you have to have something behind the scoop for the air pressure to build up on. In a boat, there's nothing behind the backwards scoop, just open air.


    1984 Youngblood TX-19 SOLD

  16. #14
    1 boat's never enough Bigtorq's Avatar
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    Out of curiosity we ran my buddies boat, who had a backwords scoop, with GPS and ran three passes at 62 mph. Then turned it around facing forward and ran three passes at 57 and 58 mph. As far as we could tell, all things were equal. Not sure what it means but I now run mine facing back (for the water thing as well).

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