[toddrod]

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.

 

[dodge man]

Save your money, its not going to help. In the old days with a carb, maybe they helped a little bit.

 

[huntergreen]

thats what i was going to say, don't see it works with fuel injection and all our electronics.

 

[RadioFlyer]

They work good on 300/400hp outboard Mercs strapped to a 20' Allison Sport. :smileup:

 

[snrusnak]

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.

 

[CdnoilRAM]

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.