Hello,
I was thinking about building my own chassis dyno. I could get an used eddy current brake, the electronics and software is also no problem.
The only thing left is a good idea for the rolls. Big rolls are expensive and heavy, small rollers have the disadvantage of bad tire deformation and
wheel slip.
So the big question is: why not use regular car wheels/tires as rolls? This would give big diameter and low weight, is easy to balance and is
cheap.
What happens when running tire-on-tire on high speed and load? What other disadvantage might there be?
I would appreciate any thoughts about it.
Regards, Fant
[Edited on 19/2/17 by Fant]
Have you had a look at the hub dyno's. May be easier to engineer then a true rolling road.
http://www.dynomitedynamometer.com/axle-hub_dyno/axle-hub-dyno.htm
quote:
Originally posted by Ugg10
Have you had a look at the hub dyno's. May be easier to engineer then a true rolling road.
http://www.dynomitedynamometer.com/axle-hub_dyno/axle-hub-dyno.htm
There are various sets of brake testing type roller sets on the bay. Start prices at £200, £600...
quote:
Originally posted by SPYDER
There are various sets of brake testing type roller sets on the bay. Start prices at £200, £600...
I may be miles off but I can't see rubber on rubber traction being even remotely as good as rubber on adhered ceramic grit on a roller. Plus the risks of a blowout are double.
quote:
Originally posted by coyoteboy
I may be miles off but I can't see rubber on rubber traction being even remotely as good as rubber on adhered ceramic grit on a roller. Plus the risks of a blowout are double.
Its very common practice for at least one major Tyre manufacture to test tyres by running one against another in a 'tyre on tyre' test.
Providing you monitor the tyre pressure and heat build up it could work. However the 'tyre on tyre' tests are carried out in what look like,
and I suspect in reality are, concrete bunkers as explosions can happen when things get too hot but then that maybe only on prototype tyres (I never
asked about that and I suspect they wouldn't have told me even if I did ask).
If it was my money (and safety) then I would try and find a metal, balanced roller that is designed for the job 
I have nothing to add except I would love a rolling road in my garage! I doubt my neighbours would like it so much though!
Keep us up to date if you go ahead with the project, I'd love to see how you get on.
quote:
Originally posted by peter030371
If it was my money (and safety) then I would try and find a metal, balanced roller that is designed for the job
quote:
Originally posted by Fant
That would be the best technical solution for sure.
But I would like to have the possibility to disassemble the whole thing and move the parts around - without a big fork lift
I'm not going to send 1000hp+ through the dyno, so I'm searching for a "Add lightness" solution.
Only done one once, but it's not that expensive to take your car on a rolling road with trained operators. Odd hearing your car "go for
it" when it's static, but the equipment's all there and with you stood out the way the safety element has to be higher too.
Don't get me wrong I'd love to have my own RR, but there are a few other things I'd be looking to have first!
Primarily a garage that wasn't being converted into a bedroom 
Question to OP...where are you?
Can't see a location in your profile, but if we know where you are another member may be able to recommend a rolling road local to you.
quote:
Originally posted by nick205
Question to OP...where are you?
Can't see a location in your profile, but if we know where you are another member may be able to recommend a rolling road local to you.
There was a member that went to the adventure of making a dyno..
I´m sure that if you search you´ll find the thread, else, someone with better memory will post user and thread...