NN2 Posted January 13, 2009 Report Posted January 13, 2009 Before someone starts bashing me about wanting to build custom pipes, stop. That's not what this post is about. I'm simply asking, "for those that do have any knowledge on it" what is required for a banshee motor (or 2 stroke for that matter) to breathe the most efficiently. For example, what should the length of tube be before increasing to a larger size, how large of expansion chamber, etc. I know, I know, it depends on the setup, yada, yada...... I need to hack up a set of pipes to fit the banshee motor in a YFZ 450 chassis anyway but I want them to look like they were made for it. With that said, I would like to improve the pipes if possible since I'm already cutting and bending the shit out of them. From what I've read, it seems a slightly longer tube coming out of the cylinder with a bit more volume in the expansion chamber increases power. The RZ cylinders on the motor will be ported. I'd like them to really be able to "sing" on the top end. I thought I've heard that the RZ motors, set up correctly, are still making good power at 12K rpm. Once again, I'm looking for constructive criticism, thoughts, ideas. This all may be a total waste of time. Not sure yet. Thanks for any positive input guys. Quote
Snopczynski Posted January 13, 2009 Report Posted January 13, 2009 Read this book. Its more than we could ever type out. They also make two stroke pipe programs that are available on the net. Quote
dajogejr Posted January 13, 2009 Report Posted January 13, 2009 F that...I say go for it. Some of the best builders in the world, pipe makers, etc....learned by making mistakes, trial and error. I say go for it...and wish you best of luck!! Quote
KEVSWS6 Posted January 13, 2009 Report Posted January 13, 2009 A pipe program makes it real easy. Same with porting and head configurations. Quote
NN2 Posted January 13, 2009 Author Report Posted January 13, 2009 Didn't know there was such a program available. Thanks guys and Snop for the book reference. I might add that book to my collection of "how to" books. Quote
Snopczynski Posted January 13, 2009 Report Posted January 13, 2009 Yup, I have a bunch of pgrograms on my pc at home. There is a pipe design program in there. Quote
J.J. Posted January 14, 2009 Report Posted January 14, 2009 Good luck with your build, would love to see some progress pics. Two- Stroke Performance Tuning by Graham Bell I've ridden Airtite's Bike with modified Pro Circuits and it runs strong. Pipes are crossed over, so the left cylinder exhausts to the right and vice versa. Check it out. Quote
Snopczynski Posted January 14, 2009 Report Posted January 14, 2009 Good luck with your build, would love to see some progress pics. Two- Stroke Performance Tuning by Graham Bell I've ridden Airtite's Bike with modified Pro Circuits and it runs strong. Pipes are crossed over, so the left cylinder exhausts to the right and vice versa. Check it out. Hmmmm, good center of gravity, good suspension, and tons of power. I like it! Does it seem more nimble than a banshee, how is the vibration from the motor? Quote
J.J. Posted January 14, 2009 Report Posted January 14, 2009 I only rode the bike around a gravel oval track for about 10 laps, it was fitted with Hoosiers at the back and I thought it handled better than my banshee. I also like the ergonomics and seating position of the 450 better, feels like a smaller bike. I didn't notice any vibration more than my banshee. The pipes are DG's not PC's my bad... Quote
Snopczynski Posted January 14, 2009 Report Posted January 14, 2009 I only rode the bike around a gravel oval track for about 10 laps, it was fitted with Hoosiers at the back and I thought it handled better than my banshee. I also like the ergonomics and seating position of the 450 better, feels like a smaller bike. I didn't notice any vibration more than my banshee. The pipes are DG's not PC's my bad... Hmmm, I feel like a fat kid when I ride yfz450's, but it is a pretty cool project. Quote
NN2 Posted January 14, 2009 Author Report Posted January 14, 2009 (edited) I think I have looked at all of Airtites online album of his build. I didn't know anyone had done it before and felt better about tackling it after seeing that it doesn't seem too difficult. I have been taking pics and will post them in a new topic after I am going good on it. Last weekend I got the front and rear motor mounts welded up and now I am ordering powder for the powder coat. This weekend I'll be sandblasting everything I can and prepping to put in the PC oven. Color theme is going to be either a chrome or black chrome base powder with translucent orange and then a clear. I would really like to do all carbon fiber colored plastics and upgrade the front suspension but that's going to have to wait. I'm trying to do little by little without any type of debt. Depending how much and how fast I can learn about building 2 stroke pipes, I may make my own. I have some Pro Circuits I can hack up but won't like how they look. I'll be building the +4 swing arm also. I'm just hoping to have most everything done and rideable by Mid April. If everything works, it is going to be one wicked ride. Shooting for around 80-85 HP with the motor. And I will be a FAT kid riding this thing :biggrin: Edited January 14, 2009 by NN2 Quote
fastrthnu Posted January 14, 2009 Report Posted January 14, 2009 Ive though t about doing this myself as well for a different reverse cylinder fitment. I Figured I would use an already existing pipe in the range I want and do measurements in 3/4" incraments all the way up it, and then follow the same incrament diameter pattern "traced" into my new configuration, just in a different shape. I figured this would make a good startng point. Just using the same taper in a different pipe shape. I have RZ cylinders as well and am very limited as it is to pipe selection. Quote
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