I'm planning to build a bike dyno and I need to come up with a size (inertia wise) for the roller wheel. I want to be able to dyno a 150 hp bike.
thanks, jfn2
I'm planning to build a bike dyno and I need to come up with a size (inertia wise) for the roller wheel. I want to be able to dyno a 150 hp bike.
thanks, jfn2
I ran my bike on a Dynajet 150 I think it was and it was OK. 175hp. If you can find what their setup is it'd be a good start. If I remember correctly we spun the roller to something like 130mph in 3rd gear
The DynoJet has a number on the drum, not sure what it means, inertial weight maybe because it was part of the information needed when installing updated software. I will take a photo tomorrow.
What software is anyone using on a home built inertial dyno?
I'll be using the Performance Trends Datamite system.
I believe 4.67 is in feet and the 13.82 is in kg/m*2. The new DynoJet roller seems to work out very close to those numbers.
A bit of napkin math suggests that I/r^2 (Inertia/(radius of drum squared)) would be equal to about 1.5x the mass of the bike to achieve accelerations similar to on track in each gear.
That would suggest that a bucket would accelerate about 3 times faster in each gear on the dynojet compared to the track. Does that sound about right from your experience TZ or way off the mark?
Yes I agree with you, they do seem to accelerate quite a bit quicker on the dyno than the track.
Moooools:
My bike with me on it weights 548.5 kg. Lets say that in top gear it takes me 10 secs to accelerate on the track. Using your equation ( I know it's right) I come up with 28 kg/m*2 with a .457m dia roller. Using TZ350's dynojet number of 13.82 kg/m*2 and a dia of .457m (which I also think is right) I need roughly twice the kg/m*2 to get the same acceleration. So I need to be turning 2 rollers like the dynojet one. If TZ350's dynojet roller measures somewhere around .406m long I'll need one around .816m long. Am I correct? Thanks
I'm selling up as we've bought a section and got to move house, so for sale is my beloved dyno.
It's a humble little inertia chassis dyno that was designed for doing bucket bikes, it has since been used for tuning many bikes, including a lap record setting NSR300.
It comes with everything ready to go minus laptop for screen (or can include for addition $200). That includes cooling fans and exhaust extraction as well as data acquisition module.
if you are interested I can arrange getting some photos and techinical specs sent though.
As for price i'm not sure, if you're interested get in touch 022-089-3234 or G.skachill@gmail.com
Cheers,
Glen
Looking for recommendations on a manual hydraulic brake master cylinder for inertia drum braking. 900lb drum.
Going to use a car disk and caliper, but having a hard time sourcing a master cylinder that offers fairly easy mounting and isn't vacuum assist
Outside the US there are still a lot of British Lockheed non assisted brake masters in scrapyards.
Inside the US, I'd look at aftermarket race car stuff - Wilwood probably. Dirt car applications would be a good starting place.
There are currently 1 users browsing this thread. (0 members and 1 guests)
Bookmarks