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Supercharger Size Formula:
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The supercharger size formula calculates the required supercharger displacement based on engine displacement, desired boost pressure, and supercharger efficiency. This helps in selecting the appropriate supercharger for optimal engine performance.
The calculator uses the supercharger size formula:
Where:
Explanation: The formula accounts for the increased air volume needed to achieve the desired boost pressure, adjusted for the supercharger's efficiency.
Details: Proper supercharger sizing is crucial for achieving desired engine performance, preventing over-boosting or under-boosting, and ensuring efficient operation of the forced induction system.
Tips: Enter engine displacement in liters, boost pressure in psi, and supercharger efficiency (typically between 0.6-0.8). All values must be valid positive numbers.
Q1: Why is 14.7 used in the formula?
A: 14.7 psi represents standard atmospheric pressure at sea level, which is used to calculate the pressure ratio for forced induction systems.
Q2: What is typical supercharger efficiency?
A: Supercharger efficiency typically ranges from 0.6 to 0.8 (60-80%), depending on the type and design of the supercharger.
Q3: How does boost pressure affect supercharger size?
A: Higher boost pressures require larger superchargers to move the increased volume of air needed to achieve the desired pressure ratio.
Q4: Can this formula be used for turbochargers?
A: While the basic principle is similar, turbocharger sizing involves additional factors like turbine sizing and exhaust gas flow characteristics.
Q5: What happens if I choose the wrong supercharger size?
A: An undersized supercharger may not provide enough boost, while an oversized one can cause excessive heat, reduced efficiency, and potential engine damage.