YLR Racing

[husaberg]

More on dynos,

Attachment 265821

Attachment 265822Attachment 265823

A water and disk brake dyno. The torque arm can easily bear down on a load cell and a shaft encoder used for rpm, then its just a simple calculation in the PC to display HP. An electric generator load could be a similar setup.

Before working at Uni I worked at an Automotive Machine Shop that had a Heenan & Froude water-brake dynamometer. You manually recorded the readings and calculated HP from the Torqe and RPM.

A quick explanation of how to operate a water brake taken from:-

http://www.douglasmotorcycles.net/index.php?topic=604.0

Here we see a Heenan & Froude type DPX1 water-brake dynamometer. Inside the housing is an impeller running in water. The hand wheel controls sluices that increases or decreases the load or friction. The absorbed power is converted into heat and carried away by the water. Partially obscured by the large trumpet at the top is the dial for the spring scale that measures the torque reaction. Not sure when the DPX series first came out, but Heenan & Froude’s first patent for a water-brake was in 1911.

Attachment 265826

On this side the black rectangular object is one of the torque reaction counterweights, there would be a further stack of additional ones on top of this fixed plate, temporarily removed. At the top is the hand screw for calibrating the scale. The white face dial is a Smiths tachometer for accurately measuring revolutions per minute.

Attachment 265824



The DPX1 is a rather small dynamometer, capable of absorbing up to 150 horsepower, so was ideal for testing motorcycle engines.


1000 hp Sunbeam the first car to go over 200mph attached to a water brake dyno. Its worth a read.

Attachment 265825

http://www.localhistory.scit.wlv.ac....eam/1000hp.htm

Great stuff i have always wondered regarding the ellecty motors i think Bosch ones were there is a bit in Robinson about them. Now the software is affordable who knows they could end up everywhere. i just always thought if your going to go to the trouble of making power.... you might as well feed it back to the grid.should be super easy to calulate as well.

Also the Poms were always on the SFC/HP trail as well.
I think if someone was going to make one maybe set up so crank, gearbox, Rear wheel HP could be achievable without all the rule of thumb formulas.
I think the drop is well over estimated as per previous posts.

Oh yeah remember Burts Paddle wheel (Air resistance)one.

[bucketracer]

When I was a Tec at Auck Uni Eng dept in the 80's they had a Ricardo variable compression engine in the thermo lab that I used for checking the octane rating and calorific value of fuels.

There you are TeeZee the Ricardo is still there.

Check it out .... http://www.mech.auckland.ac.nz/uoa/thermodynamics-lab

The Engine research facility is located within the Thermodynamics Laboratory of The University of Auckland and is well equipped to conduct a wide range of engine and fuels research and development.

[husaberg]

I seen this today, obviously a little large for a bike, but the idea has some merit.

[crazy man]

so how is the dyno softwere going low ling?

[Yow Ling]

so how is the dyno softwere going low ling?

The software appears to go fine, the dyno drum is proving to be a little more difficult, so I will be making a new centre section
Are you looking for some software? All up the cost was $900 nz that logs 2 rpm channels and 2 analog has a conditioned ignition pickup as well as a drum sensor and usb connection.
The basic version of the software allows 2 runs to be overlayed the Pro version (100 bucks more) allows unlimited runs to be overlaid
The Datalogger is flash as, all smd construction.
Got racing for the next 2 weekends so dont know if Ill get too much done before then

http://performancetrends.com/dtm-dyno.htm

I got the mini USB version

[Buddha#81:Me]

While Mikes not working on the team Dyno our 11 year old upcoming rider has been doing laps of Ruapuna on the team RS50

[Bert]

While Mikes not working on the team Dyno our 11 year old upcoming rider has been doing laps of Ruapuna on the team RS50

Love it

by the looks of that, he will be giving his dad "the learn" shortly.

[Kickaha]

he will be giving his dad "the learn" shortly.

What do you mean shortly? Buddha was tapped out trying to keep up

[crazy man]

The software appears to go fine, the dyno drum is proving to be a little more difficult, so I will be making a new centre section
Are you looking for some software? All up the cost was $900 nz that logs 2 rpm channels and 2 analog has a conditioned ignition pickup as well as a drum sensor and usb connection.
The basic version of the software allows 2 runs to be overlayed the Pro version (100 bucks more) allows unlimited runs to be overlaid
The Datalogger is flash as, all smd construction.
Got racing for the next 2 weekends so dont know if Ill get too much done before then

http://performancetrends.com/dtm-dyno.htm

I got the mini USB version

thanks, buy the end of the week l will know if the software made by the young fello will be a go or not.

[quallman1234]

thanks, buy the end of the week l will know if the software made by the young fello will be a go or not.

Weeeeeeeeeee we win! We took our Dyno to the workshop and did a few runs the other night. Ended up just using simple dyno for the time being .
13.2HP out of my very poorly/barely running FXR (Wrong pilot/lean all over, approiate jets ordered) so its probably not that far off. Glen even did some runs on his supercharged bucket.
Still got ventaliation to deal with though! Glen has done a 90% of the work and a great job too, so i can't claim it too much!

[F5 Dave]

Let us know when you have something stable & we can do a calibrating run to compare, was looking at doing Skunks bike very soon so you could bring a bike up maybe.

[crazy man]

Weeeeeeeeeee we win! We took our Dyno to the workshop and did a few runs the other night. Ended up just using simple dyno for the time being .
13.2HP out of my very poorly/barely running FXR (Wrong pilot/lean all over, approiate jets ordered) so its probably not that far off. Glen even did some runs on his supercharged bucket.
Still got ventaliation to deal with though! Glen has done a 90% of the work and a great job too, so i can't claim it too much!

had it running a month ago but feel it was not giving the right readings. was about right on the 400 but the bucket was not right. things have got better but still not there

[crazy man]

quallman...did you lot buy a program or make it?

[Sketchy_Racer]

quallman...did you lot buy a program or make it?

Nah we just downloaded a free dyno program called "Simple dyno"

https://sites.google.com/site/simpledyno/

It's limited but when setup is very repeatable, which to be honest is all I car, the actual number is mostly irrelevant to me, but I will try set it up as a back to back with a dynojet or similar some time. It does seem to read correctly though, the HP levels are right the power curve just looks funny because it is reading drum torque and HP rather than motor

[Yow Ling]

Nah we just downloaded a free dyno program called "Simple dyno"

https://sites.google.com/site/simpledyno/

It's limited but when setup is very repeatable, which to be honest is all I car, the actual number is mostly irrelevant to me, but I will try set it up as a back to back with a dynojet or similar some time. It does seem to read correctly though, the HP levels are right the power curve just looks funny because it is reading drum torque and HP rather than motor

Looks pretty good, and it saved you a grand !