Enter the engine speed in RPM and the speed of sound in the exhaust medium to calculate the optimal exhaust length for tuning purposes.
Exhaust Length Formula
The following formula is used to calculate the optimal exhaust length:
L = (c / (2 * N)) * 60
Variables:
- L is the optimal exhaust length (meters)
- c is the speed of sound in the exhaust medium (meters per second)
- N is the engine speed (revolutions per minute)
To calculate the optimal exhaust length, divide the speed of sound in the exhaust medium by twice the engine speed, then multiply by 60 to convert from seconds to minutes.
What is Exhaust Length?
Exhaust length is the distance from the exhaust valve to the end of the exhaust system. The optimal length can improve engine performance by enhancing the scavenging effect, which helps remove exhaust gases and draw in fresh air. This calculation is particularly useful for performance tuning in racing applications.
How to Calculate Exhaust Length?
The following steps outline how to calculate the optimal Exhaust Length.
- First, determine the engine speed (N) in revolutions per minute (RPM).
- Next, determine the speed of sound in the exhaust medium (c) in meters per second.
- Use the formula L = (c / (2 * N)) * 60 to calculate the optimal exhaust length (L).
- Finally, calculate the optimal Exhaust Length (L) in meters.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem:
Use the following variables as an example problem to test your knowledge.
Engine Speed (N) = 3000 RPM
Sound Wave Speed (c) = 343 m/s (speed of sound in air at 20°C)