Скачать или смотреть How to install Velocity Stack for Yamaha YZF R15v3/v4/M SCK Racing 32mm Intake Air Funnel

SCK Racing velocity stacks/air funnels for track use, allowing smooth and even entry of air at high velocities/RPM into the intake system.

The optimal length of velocity stacks is not a one-size-fits-all answer but depends on the specific engine and its intended use. Generally, shorter stacks tend to work best for engines that produce power at higher RPMs, while longer stacks are better suited for engines that make their power at lower RPMs. The length of the stack is a key factor in how it affects the resonant pressure wave, which in turn influences the engine's power output.

Factors Affecting Optimal Stack Length:
Engine Type:
Different engine types (e.g., small-block, big-block, inline-four) will have optimal stack lengths that are suited for their specific power characteristics.
Engine Displacement:
Larger engines may require longer stacks to maximize power output, while smaller engines might benefit from shorter stacks.
Intended Use:
If the engine is designed for racing or high-performance applications, the stack length may be adjusted to maximize power at the relevant RPM range.
RPM Range:
The length of the stack can be adjusted to optimize power within a specific RPM range. For example, shorter stacks may be preferred for engines that make peak power at higher RPMs, while longer stacks might be better for engines that make peak power at lower RPMs.
Resonance:
The length of the stack can affect the resonant pressure wave that is generated within the intake system. This resonant wave can either boost or dampen the engine's power, depending on its length and diameter.
Considerations for Stack Length:
Design Constraints:
Physical constraints, such as the size of the air filter or throttle body, can limit the maximum length of the stack.
Radii:
The radius of the stack, particularly at the inlet, is also crucial for performance and should be optimized along with the stack length.
Taper:
The taper of the stack, if used, can also affect its performance, but the radius is generally more critical.
Examples:
Short Stacks:
May be used on engines that make power at higher RPMs or in racing applications where maximizing power at the top end is crucial.
Long Stacks:
May be used on engines that make power at lower RPMs or in applications where maintaining torque throughout a broader range is desired.
Variable Length Stacks:
Allow for adjusting the stack length based on the engine's RPM range, potentially maximizing power throughout the entire rev range.