![]() The acceleration of air flow into a duct is inherently a highly efficient process and the difference between even the crudest radius inlet, and the most aerodynamic shape possible is slight, amounting to no more than a few percent. A longer inlet pipe will create a later intake pressure wave that will help keep the air in the chamber until the intake valve closes.ĭetailed velocity stack working principle However, it is actually that the intake valve is closing too late and the combustion chamber is simply overfilling and blowing back out the intake port, before the intake valve closes. It is commonly related that "stand off" (air–fuel mix that gets pushed back out of the port, usually at full throttle / low rpm) is somehow captured by installing a longer intake pipe (stack). Most current aftermarket stacks are designed to be run "in" the airbox and a company that does research well will have some applications that have all the same length and some applications that have differing lengths of stacks on different cylinders. The length of the stack is known to have a direct effect on a particular engine's boosted power range. Modified engines often have the original air box and associated ducting removed and velocity stacks are installed as accessories. Modify the dynamic tuning range of the intake tract by functioning as a resonating pipe which can adjust the frequency of pressure pulses based on its length within the tract.Allow smooth and even entry of air at high velocities into the intake tract with the flow stream adhering to the pipe walls known as laminar flow.It is unrelated to the noise maker or signaling air horn.įunction Illustration of the velocity stack principle It can be of differing lengths and fitted to both carbureted and fuel injected engines. JSTOR ( October 2019) ( Learn how and when to remove this template message)Ī velocity stack, trumpet, or air horn is a trumpet shaped device fitted to the entry of an engine's air intake system.Unsourced material may be challenged and removed. ![]() Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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