DadtoaMarine

The Physics of Gas 101


1. The lighter a gas is the easier it flows
2. The hotter a gas is the more pressure it will exert
3. A lighter and hotter gas has less resistance to change then a cooler gas
4. Sound will travel slower and with less pressure through a lighter atmosphere and faster and with more pressure through a denser one.

Has the cooler and heavier intake charge enters the engine it helps to force out the hotter and lighter exhaust gasses. Has the exhaust travels through the tuned pipe part of the sound is reflected back into the cylinder forcing the intake charge back into the engine. It is that simple

RC 2 stroke exhaust 101

1. Has the piston moves down on the power stroke it uncovers the exhaust port.
2. Hot exhaust gasses start to escape through this port creating a negative pressure in the cylinder
3. The piston then uncovers the intake port where the pressure inside the crankcase forces the intake charge into the cylinder
4. Has the exhaust gasses pass through the exhaust pipe they meet the resonator which forces part to the sound waves back towards the exhaust port. This has the same effect has putting your thumb over the end of a garden hose and creates some back pressure inside the cylinder. This effect helps keep the colder and denser fuel charge from exiting through the exhaust port while letting the remaining exhaust gasses escape.
5. The more pressure created in the cylinder the more residence sound that is created by the engine and the stronger the sealing effect created by the tuned pipe.

Now put this together with what I wrote before and you have enough information to understand why both superchargers and, if produced on the small scale, turbochargers will work on these engines. If you cannot understand it by now then give up and take a few classes on the principles of the internal combustion engine.