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Author Topic: Method for putting a load on a dyno?  (Read 1970 times)
Jeff K
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Posts: 3071


« on: September 19, 2009, 07:12:37 AM »

I throw this out every once in a while.

I have a motorcycle Dyno. It is an inertia dyno, so it doesn't have any way to put a load on a bike.

I'm looking for CHEAP ideas for loading the dyno.

I only spent $1500 on the dyno, I don't want to spend another $20,000 on a break.

Maybe an eddy current break from a crane?  

Surplus hydraulic motor?

Ideas?



« Last Edit: September 20, 2009, 08:58:51 AM by Jeff K » Logged
mikeb
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Posts: 311


vrcc-29271

dansville mi by lansing mi


« Reply #1 on: September 19, 2009, 07:30:44 AM »

how about a hyd pump? dont know how ya would drive it ?but you could very the flow to make it add back pressure to the dino ? they spin pretty free with no load and as you restrick the flow it would turn harder?ill  follow the thred so if ya need a pump i think i might be able to help .. i use dextron 3 in my pumps mike
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mike & kari
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fstsix
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« Reply #2 on: September 19, 2009, 11:20:55 AM »

You know i seen a HD trying to reach 100 hp at a event and he was at 95 hp so the tech added 10 lb"s to the rear tire and Shazamm 100 hp. I always wondered if you tie down rear with Motorcycle straps Ratchet type would that put some resistance or drag ?
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BlueValk
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Posts: 108


Albuquerque, NM


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« Reply #3 on: September 20, 2009, 08:18:58 AM »

How about some high capacity disk brakes?  They may have to cool between runs.  They slow semi's going down hill.
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Madmike
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Posts: 837


Campbell River BC, Canada


« Reply #4 on: September 20, 2009, 09:42:08 AM »

how about a hyd pump? dont know how ya would drive it ?but you could very the flow to make it add back pressure to the dino ? they spin pretty free with no load and as you restrick the flow it would turn harder?ill  follow the thred so if ya need a pump i think i might be able to help .. i use dextron 3 in my pumps mike

If the dyno that you have (inertia dyno) is a drum on an axle and the drum is turned by the motorcycle wheel then you could couple the hydraulic pump up to the drum's axle with a drive shaft and put load on by restricting flow from the pump or other use of the flow. 

You would likely want a big gear pump and open centered valving so that there will always be flow through the system.  You will have to provide for cooling the oil as restriction and loading will create heat that you need to get rid of.

Another method would be to drive a generator and then load the generator electrically.  i worked at a place and we built up gene sets and we had an electrical load bank that we used.  The load banks that I have seen are plates and liquid.  You lower the plates into the liquid to increase load.

Another method that I have seen is a variation on the hydraulic - it uses water as a hydraulic fluid instead of oil.  Same basic drive arrangement, drive a pump and restrict the flow.

You could use a truck diff and drive it and impose load through the brakes. 

I don't know how you would calculate the load to be able to calculate the HP of the driver for any of these methods but standard measures (GPM, PSI, Volts, Amps etc.) should apply.

As far as cooling the engine there are usually lots of  squirrel cage blowers around.  I got a grain dryer at an auction yesterday for $20 ....... has a 2hp 110/230 3450 RPM motor on it that I need  for something else.   
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Jeff K
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Posts: 3071


« Reply #5 on: September 20, 2009, 10:45:22 AM »

how about a hyd pump? dont know how ya would drive it ?but you could very the flow to make it add back pressure to the dino ? they spin pretty free with no load and as you restrick the flow it would turn harder?ill  follow the thred so if ya need a pump i think i might be able to help .. i use dextron 3 in my pumps mike

If the dyno that you have (inertia dyno) is a drum on an axle and the drum is turned by the motorcycle wheel then you could couple the hydraulic pump up to the drum's axle with a drive shaft and put load on by restricting flow from the pump or other use of the flow. 

You would likely want a big gear pump and open centered valving so that there will always be flow through the system.  You will have to provide for cooling the oil as restriction and loading will create heat that you need to get rid of.

Another method would be to drive a generator and then load the generator electrically.  i worked at a place and we built up gene sets and we had an electrical load bank that we used.  The load banks that I have seen are plates and liquid.  You lower the plates into the liquid to increase load.

Another method that I have seen is a variation on the hydraulic - it uses water as a hydraulic fluid instead of oil.  Same basic drive arrangement, drive a pump and restrict the flow.

You could use a truck diff and drive it and impose load through the brakes. 

I don't know how you would calculate the load to be able to calculate the HP of the driver for any of these methods but standard measures (GPM, PSI, Volts, Amps etc.) should apply.

As far as cooling the engine there are usually lots of  squirrel cage blowers around.  I got a grain dryer at an auction yesterday for $20 ....... has a 2hp 110/230 3450 RPM motor on it that I need  for something else.   

I don't plan on using the load to calculate Hp or torque, It has the means to do that on it's own. I have the Dynojet inertia Dyno, and the software. It's old, but it works.
I only want the ability to load the dyno to make tuning my EFI bike easier, and cheaper. Dyno time isn't cheap.

I have wideband O2 on the bike so really, all I need is a way to put a load on the bike for extended periods so I can tune it.
I'll check for max power using the standard inertia Dyno setup.

Hydraulic pumps are a good option, but I'd have to find a way to keep the fluid cool.
1. lots of fluid
2. means of cooling a smaller amount of fluid. (radiator, Shell and tube)

Water would be good but finding a pump that size??

Disk brakes get hot fast, and take a long time to cool. Though they are a cheap option.

Generator is a good Idea but expensive. Unless there is a way to build something like using a large three phase motor.
I have seen generators used to power water heating elements to apply load.

??
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Blackduck
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Posts: 642


West Australia


« Reply #6 on: September 20, 2009, 05:02:09 PM »

Pump size would depend on the amount of load you wished to place on the dyno, if only about a quarter to half the bikes output ( that is road use) then a 2-3" suction port pump with a full size impeller should do it. These usually run to 1500/1800 rpm so you need to look at the gearing driving it.
As you would not be soaking up more than 150 HP a radiator out of a pick up should do it. You would then need a fan for the radiator. just control the load by a valve on the pump discharge.
A large tank maybe required to act as storage and a buffer to keep the system full at all times.
If you live anywhere near drilling companies you maybe able to get advise and a pump at the right price.
For pump info you could try checking Mission pumps online. There are a lot of firms making centrifugal pumps that would suit.
Cheers Blackduck
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Madmike
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Posts: 837


Campbell River BC, Canada


« Reply #7 on: September 20, 2009, 06:35:21 PM »

How much HP do you want to absorb??

Up here there are lots of industrial auctions where you can get stuff like you would need ... I was at an auction 2 weeks ago that had several centrifugal pumps that were driven by 25 HP electric motors, there were 3 of them that had 3 phase drivers on them and I think they went for $25 each.  You may be able to stumble on something similar in your area.  Water would be the way to go from a cost and environmental standpoint plus no real cooling issues.
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Gryphon Rider
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Posts: 5227


2000 Tourer

Calgary, Alberta


« Reply #8 on: September 20, 2009, 08:57:38 PM »

What about using the drum to spin a centrifugal fan, like a rowing machine at a gym?  It could do double duty as a load and as an air source to cool the bike.  Maybe you could find a decommissioned HVAC blower or two?
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mikeb
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Posts: 311


vrcc-29271

dansville mi by lansing mi


« Reply #9 on: September 29, 2009, 03:49:42 PM »

maybe a harbor fright generator and you could load it down with 500 watt lamps .more lamps more load?
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=45416
no oil or water needed
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i dont care what you ride just ride
mike & kari
mivrcc capital city leader
s.s.d.d.
Jeff K
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Posts: 3071


« Reply #10 on: September 30, 2009, 05:14:37 AM »

maybe a harbor fright generator and you could load it down with 500 watt lamps .more lamps more load?
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=45416
no oil or water needed


I was thinking the same thing.
I've been shopping for a Generator head unit. I'm not sure that that one would be big enough. And stepping up from there the price jumps a lot. A nice surplus unit would be perfect.
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