diamond jim wrote on 03/23/09 at 21:24:38:Gary, those look cool! What kind of exhaust do you have on the thumper? A side thought- when I was experimenting with my baffle I was amazed at how much pipe "suction" occurs between exhaust strokes. I was idling the bike and slid an 8" steel baffle into the end of the pipe maybe 2/3rds the way in. I kept a gloved finger on the outside edge of the baffle so the exhaust wouldn't blow it out. But it would literally suck the baffle in an inch and a half then blow it out against my finger, over and over with each exhaust stroke. I know it sounds crazy but I was there and saw it with my own eyes! Anyhow, I think your idea for a baffle there would help minimize how much exhaust gets sucked back into the pipe. Awesome. Looks a little tough to build. But, I've come to learn you're pretty sharp.
Jim,
The suction information is interesting. I'm not an engine expert by any means, but I think that is a normal part of the exhaust stage of the engine.
It doesn't look that hard to build. To me, looks like a pipe with cut discs welded to it. If you read on the site link, the guy built these baffles for his corvette. Then others started asking him to make them. He builds these for covettes, race cars, and busses/trucks. Claims large improvement in fuel efficency for the trucks and busses. The spiral design is supposed to improve sp
I want to build something similar using grilled sheet metal instead of stainless for the main pipe which will be open. But I'll experiment with grilled or solid for the diverters.
What I really want for both of my bikes is a tunable option while riding. A switch that will open/close grilled disks or diverters to adjust to present riding conditions. Something like these:
http://cyclesolutions.net/index.php?option=com_store&manufacturer=1&item=AP-H... I already have some ideas for this. It would really help the Shadow out the most, but would work on the savage as well. Closed for quiet/low-end torque, open for louder/top-end performance.