Cost $20.00, came with a 4T header design program and a cone printing program that breaks large cones up to fit on 8.5x11 pages you can cut out and tape together. 2 Stroke expansion Chamber Software- I used 2 Stroke Wizard by Build and Click. Grinder and/or file Other Usefull Things: Welder (something capable of welding thin metal!) and related supplies- wire brush, clamps, gloves, helmet, safety gear, etc. Box and Pan Brake (could just use stake table but.) Measuring & Marking tools- marker, scratch awl, steel rule, dividers, etc Safety equipment- safety glasses, ear plugs, gloves, etc. LOTS of welding rod- I used a 110v wire feed welder Cold Rolled sheet metal- I used 18 gauge
Ability to use expansion chamber design software (OR, be really good at math or want to build 50 different pipes (trial and error)) Understanding of and ability to use Shears, Brakes, and other metalworking tools There are alternate ways to make pipes, which I will discuss at the end of this instructable. I'm lucky enough to have access to a shop that has everything I needed. It requires a lot of big, expensive tools. I think there is an easier way- done by cutting out two sheets in the correct shape, welding the edges, and the pumping ultra high pressure water in to "expand" the pipe, but I didn't have the tools at the time to do it like that. Please note, this is NOT the only way to do this. I dug it out of storage a few years ago and began this process, so follow along as I make mistakes and learn a thing or two about building your own expansion chamber! found it in a grain bin around '95, back when I wasn't allowed to have bikes. This Piece Of Junk was (and is) my first motorcycle. I've always wanted to build an expansion chamber. That's a very loose explanation, but there you go. Check out this link, it will make a little more sense.Īnimation of Two Stroke expansion chamber: Īs the pressure wave reflects back, it has a similar effect to turbocharging or supercharging a 4 stroke- it rams fuel and air that leaked into the pipe back into the cylinder under higher pressure, causing the motor to have more power (more fuel & air = bigger bang). A tuned pipe has a set of cones- Divergent (meaning the cone gets bigger) and Convergent (meaning the cone gets smaller) that are built to cause "echoes" or pressure waves to reflect back, which if done properly can increase the power of the engine.
The way a two stroke motor works causes them to be fairly noisy and a bit inefficient. There are many ways to boost the power, one of which is by installing a "tuned" pipe. They are so simple and fun that I've always enjoyed tinkering with them.
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