Moped Army

steven asked about transfer ports.

I didn't explain it well in that gofastnews story and david vizard hadn't shown me his photography techniques at that time. I could photograph it better now if only I could figure out how to post it.

Look at it this way: a reed motor has an advantage in that it has shooter transfer ports blasting a mixture shot strait up to the head. This turns over the chamber contents so it can clear residual exhaust gases from the head to escape out the pipe. The shooter(s) are upward aiming transfer ports located opposite the exhaust port.

So, if a piston ported motor could have shooters the power and powerband would improve but dam, the intake port is in the way. My answer is to put in shooters, fed from the side transfer ports. Shooters should be farthest from the exhaust port so what I did was take a rat-tailed file, or dremel, and make some small barreled shape cuts that point upward. The top of these barreled cuts will have more transfer duration then the existing transfer windows so that meens they will open first Which (urrreeeaaka) helps another problem of having an overly stuffed crank so this will bleed off some pressure before the rest of the port opens. In the gofast story I was experimenting with making the shooters bigger and bigger but I can tell you now after about 400 dyno pulls later to keep them small and shallow like about only 3mm above the top of the main windows. Don't disturb the aiming of the main windows that are designed to flow mixture across the piston crown which is how it will flow as the rest of this window is uncovered.