treadmill dyno

timcat · Post by **timcat** » Wed Jan 14, 2009 1:31 am

im gonna make one cause i fig that it would be a great thing to have with trying to tune scoots and peds . i wont have any gauges or any thing til i have more money but plan to get rpm and temp gauge ill secure the bike with raticheting tie down straps

ALOW1 · Post by **ALOW1** » Wed Jan 14, 2009 1:43 am

timcat wrote:im gonna make one cause i fig that it would be a great thing to have with trying to tune scoots and peds . i wont have any gauges or any thing til i have more money but plan to get rpm and temp gauge ill secure the bike with raticheting tie down straps

Thats one of the most messed up things that I have read on here in awhile. Are you serious?

I'm still laughing after reading that.

timcat · Post by **timcat** » Wed Jan 14, 2009 1:47 am

yes im seerious do you know how much it sucks if you stall or flood out like 1/4 mile or more from home and have to push the d*** scoot back home this eliminates the problem

timcat · Post by **timcat** » Wed Jan 14, 2009 1:51 am

and if im working on some one eleses bike i dont have to worry bout dumping it and getting sued

ALOW1 · Post by **ALOW1** » Wed Jan 14, 2009 1:56 am

timcat wrote:yes im seerious do you know how much it sucks if you stall or flood out like 1/4 mile or more from home and have to push the d*** scoot back home this eliminates the problem

That just seems like a messed up thought to me, I'm sorry but you really did make me laugh. Its just funny thinking about you or anybody else actually doing it.

timcat · Post by **timcat** » Wed Jan 14, 2009 1:59 am

yeah it does seem silly but i really find it to be a useful idea
in fact i just put a wanted add on craigs list for one

burnt_toast · Post by **burnt_toast** » Wed Jan 14, 2009 12:32 pm

this should be interesting

DJPhatman · Post by **DJPhatman** » Wed Jan 14, 2009 2:02 pm

timcat, if/when you build it, shoot me a PM. I live about an hour to and hour and a half from you, and I want to see this in person.

timcat · Post by **timcat** » Wed Jan 14, 2009 5:07 pm

ok i can do that i am building it as soon as i get a tread mill

SprEE*MP* · Post by SprEE*MP* » Wed Jan 14, 2009 9:29 pm

dood, thats awesome, I think i just might make one myself. I totaly agree with the reasone, no more staling and having to push her back home!!!

steffen707 · Post by **steffen707** » Wed Jan 14, 2009 11:49 pm

This would be super duper sweet; however, i own a horizon fitness 5.2t treadmill. Like the best model they made in 2006, was $2000.

It only goes 12mph, so you're gunna have to figure out some way to count how many rotations of one of the rollers, or a gear perhaps that's connected to the electric motor inside.

A regular dyno uses some kind of brake on the rollers, and i'm thinking that these scooters won't be capable of spinning up the stock motor very well, thus giving you horrible data for acceleration. You may however be able to calculate top speeds of mods when tuning, as well as jetting would be very helpful. If you disconnected the motor, the rollers would spin quite freely.

Either way, for a decent treadmill that wouldn't explode, you'ld spend some good money.

That being said, I think this is an awesome idea, and you should think outside the box once in a while. I once saw on the net a guy that made a dyno out of a semi rear end and wheels. Used the massive rear brakes as the dyno brake. Ghetto, but it worked.

maddog · Post by **maddog** » Thu Jan 15, 2009 9:30 pm

some people may think that 2 stroke engines are easy to work but they have alot of bugs, i broke 2 belts on my rides, one was dry rot and the other was i forgot to change the belt after doing the dio trans coversion.

ALOW1 · Post by **ALOW1** » Thu Jan 15, 2009 11:45 pm

maddog wrote:some people may think that 2 stroke engines are easy to work but they have alot of bugs, i broke 2 belts on my rides, one was dry rot and the other was i forgot to change the belt after doing the dio trans coversion.

Both of those belts broke because of something that was your fault, what does that have to do with a 2 stroke having bugs?

steffen707 · Post by **steffen707** » Fri Jan 16, 2009 12:45 am

maddog wrote:some people may think that 2 stroke engines are easy to work but they have alot of bugs, i broke 2 belts on my rides, one was dry rot and the other was i forgot to change the belt after doing the dio trans coversion.

2 strokes are the bomb. There are only like 8 wires connected to the motor and trans. They make more power for their size than 4 strokes. Very simple.

I have a 87 with like 6000 miles and I don't think the belt or brakes were ever replaced until i'm going to this week. I dunno how you broke 2 belts, must be throwing down some major power.

Post by **noiseguy** » Fri Jan 16, 2009 2:16 pm

Are you looking for a horsepower dyno, that you can adjust the load and get HP / torque ratings? Do you know how to build such a thing and run the equations?

Or are you looking just to build something so you can run it off the street with little to no load?

If it's the latter, best of luck, you'll need some sort of brake to absorb energy but I can't think why it wouldn't work.

If it's the former, you've got your work cut out for you. Really, the best thing to do would be to build a chain-driven dyno, with a chain and sprocket driving a modified automotive alternator, which is in turn hooked into a large (water-cooled?) resistor. This is how most bike dynos are run, with the rear wheel removed and motor hooked straight to the dyno via chain. You would need to create a sproket to replace the rear wheel in this case.

Auo alternators are cheap and will absorb around 35 HP. You'd need to modify it so that it runs as a simple generator, then you need to build some sort of adjustable power management (might just be a large rheostat) to dump power to the resistor. The resistor could be something simple, like a long loop of UL wire in a barrel of water. Finally the data acquisition system, probably a scrap PC with data in for RPM and the torque setting.

I'm not up on the specific equations, but I'm sure you can find an engineer or engineering textbook at Kettering that can walk you through the equation.

If it sound daunting, that b/c it is. But certainly do-able. Just not sure it's worth the effort; KeithW's method with a data-capture GPS is simpler and probably cheaper.

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