A velocity stack gives the engine a chance to re-inhale that fuel which can be helpful. ![]() "Stand off" is fuel which is spit back out of the intake by pulsing action in the intake system. “Racy” in appearance, velocity stacks do not usually have a major impact on airflow or performance unless the stock horn is of an inferior design.īeyond air flow improvement a velocity stack may be useful in containing "stand off" which may result from removing the original ducting. As a result it’s not unusual to see a race engine with differing lengths of stacks to fine tune each cylinder. The length of the stack is known to have a direct effect on a particular engine rpm range. However in professional motor racing where even fractions of a percent improvement count, this small improvement is welcome. ![]() Modern fuel injection systems with a single air inlet typically incorporate some sort of tapered entrance, nullifying what gains might be had from a true velocity stack. Modified engines often have the original air box and associated ducting removed and velocity stacks are installed as aerodynamic replacements. Alter the dynamic tuning speed (dynamic engine compression) if the overall length is changed thereby changing the tuned length to a lower or higher rpm. Modify the dynamic tuning range of the intake tract by functioning as a small reverse megaphone which can extend the duration of pulses within the tract.ģ. Allow smooth and even entry of air into the intake duct with the flow streams boundary layer adhering to the pipe walls.Ģ. It can be attached to an airbox inlet or to each cylinder in an IR (individual runner). ![]() Pretty good readĪ velocity stack is a generally cylindrical tube with a radiused inlet end device which is added onto the air entry location or locations of an engines intake system, carburetor or fuel injection.
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