Gaining Speed & Power with Velocity Stack for IC Engines

In summary, a velocity stack is an air funnel that straightens and accelerates airflow into the carburetor, improving the performance of an internal combustion engine. The length and path of the stack can affect peak power and total power, and tuners often experiment with different sizes and shapes. Some have even tried variable length stacks or using different inlet valves at lower RPMs. Additionally, velocity stacks also add a cool visual element to the engine.
  • #1
wolram
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Why would a velocity stack improve an ic engines performance?
 
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  • #2
It's pretty much just an air funnel. It straightens and accelerates the airflow into the carbeurator to make breathing easier. (And they look cool.)
 
  • #3
Low inlet restriction.
 
  • #4
harmonic pulses play a roll too
liength of stack/ and total path vary peak power

both inlet and out let's size and path can move peak and total power
up or down the RPM range
so tuners play with size and shapes

some have tryed varyable leingth stacks that move in or out as RPM changes
and some vary valve opening timeimg or use one of 2 inlet valves at lower RPM in 4 valve motors

and yes they look cool too
 
  • #5
Thanks for the additional info, Ray. I knew that manifold runner length did that, but not the stacks. Not that I'll ever use the things, but it's a good tip.
 

FAQ: Gaining Speed & Power with Velocity Stack for IC Engines

What is a velocity stack and how does it work?

A velocity stack is a device that is used to increase the airflow into an internal combustion engine. It is usually a tapered metal or plastic tube that is fitted onto the air intake of the engine. The tapering shape of the velocity stack helps to increase the velocity of the air as it enters the engine, which leads to better combustion and increased power.

Can a velocity stack improve the speed and power of an engine?

Yes, a velocity stack can improve the speed and power of an engine by increasing the amount of air that enters the combustion chamber. This results in better fuel combustion and increased horsepower.

Are velocity stacks only beneficial for high-performance engines?

No, velocity stacks can benefit all types of engines, from high-performance to everyday vehicles. The increased airflow provided by the velocity stack can improve the overall performance of the engine, resulting in better fuel efficiency and increased power.

Are there any downsides to using a velocity stack?

While velocity stacks can provide significant performance benefits, they may also increase the noise level of the engine. Additionally, some velocity stacks may not be compatible with certain engine configurations and may require modifications for proper installation.

Do I need to tune my engine after installing a velocity stack?

It is recommended to tune the engine after installing a velocity stack to maximize the performance benefits. This may involve adjusting the air/fuel mixture or other engine parameters to optimize the airflow and fuel combustion. Consult a professional mechanic or engine tuner for proper tuning instructions.

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