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  #1  
Old 03-11-2012, 11:54 AM
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Default Velocity Stack?

Yeah I was looking around on ebay and was checking out these velocity stacks, says it adds hp blah blah blah. Sorry I don't know enough about computers otherwise I would have put a link to the page. What are these velocity stacks anyway? To me it just looks like another type of tb spacer.
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Old 03-11-2012, 02:21 PM
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Save your money, its not going to help. In the old days with a carb, maybe they helped a little bit.
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Old 03-11-2012, 02:23 PM
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thats what i was going to say, don't see it works with fuel injection and all our electronics.
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Old 03-13-2012, 01:48 PM
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They work good on 300/400hp outboard Mercs strapped to a 20' Allison Sport.
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Old 03-13-2012, 02:01 PM
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Usually they will help a little with higher rpm's. They help smooth the airflow a little. Very minor difference usually, and on a street engine that see's lower rpm's, even less of a difference. Probably not worth it.
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Old 03-13-2012, 07:12 PM
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A velocity stack is basicallu a bernouli bell mouth, it's designed to allow the flow of air to pass from an infinately large reservoir into a circular opening while maintaining laminar flow characteristics. This allows for a large flow of air to pass through the opening, increasing velocity, while maintaining laminar (smooth) flow of air. In our case, you would get a smooth flow of air into the intake manifold, and then you'd destroy that flow of air as it's broken into 8 separate streams that are pulled through the intake runners.

Put this in the same category as throttle body spacers. People believe a throttle body spacer does something special by swirling the air as it passes into the intak manifold... and then it's destroyed as it breaks into the 8 intake runners. The only place you see any benefit with velocity stacks is if you are running turbos and don't want a filter, or if you are running 2x 4bbl carbs and you have a stack for each barrel of the carb.
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