Determining The Correct Size For 2-Stroke Expansion Chamber

 

To calculate the size of an expansion chamber on a 2-stroke engine, you will need to know the engine's displacement, exhaust timing, and the speed at which the engine will be operating.
 

First, determine the engine's displacement, which is the volume of air-fuel mixture that the engine can draw in during one complete engine cycle. This is typically measured in cubic centimeters (cc) for small engines like those found in motorcycles, or in liters for larger engines.

Next, determine the exhaust timing, which is the point in the engine's cycle at which the exhaust valve opens. This is typically measured in degrees of crank rotation.

Finally, determine the speed at which the engine will be operating. This is typically measured in revolutions per minute (RPM).

Once you have this information, you can use a formula to calculate the size of the expansion chamber. The exact formula will vary depending on the design of the expansion chamber, but a common formula is:

Chamber volume = (engine displacement * exhaust timing) / (2 * speed)

For example, if an engine has a displacement of 250cc, an exhaust timing of 180 degrees, and will be operating at 8000 RPM, the expansion chamber volume would be calculated as:

Chamber volume = (250cc * 180 degrees) / (2 * 8000 RPM) Chamber volume = 22500 / 16000 Chamber volume = 1.4 liters

Note that this is just an example, and the actual size of the expansion chamber will depend on many factors, including the design of the engine and the type of performance you want to achieve. It is best to consult a professional or refer to specific design guidelines for more accurate information.