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Rafal
Flying Brick Rider
Joined: 05 Jan 2009
Posts: 257
Location: Wroclaw, Poland
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 Posted: Mon Apr 04, 2011 4:14 am Post subject: Mine K1100RS dyno run |
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Hello!
Thanks to my friend initiative a was able to make a dyno run of 1995 K1100RS.
Here is the plot:
Click for full size 
Too sum up: 95,4 BPH @8000 on clutch and 92,8 Nm @ 5970 . Quite well for almost 100 000 Km and over 15 years old engine.
One thing that make me not sleep well is torque loss, ~ 14 Nm loss, and poor result on fumes probe -> problems with combustion -> valve clearance, valve burn out or compression problem. The investigation is ongoing  .
And just for an amusement the video.
http://www.youtube.com/watch?v=8p1rkGGl4tI
Best regards,
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Rafal
K1100RS is a real beast (in Marrakesh Red)
K75S is a real beauty - she has gone  , but not to far  .
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Geoff
Flying Brick Rider
Joined: 08 Feb 2007
Posts: 551
Location: Illinois
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| Posted: Mon Apr 04, 2011 10:33 am Post subject: |
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Thanks for sharing.
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2000 R1100RT
2008 H-D Electra Glide Ultra Classic |
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granth
Mad Brick Rider
Joined: 04 Aug 2010
Posts: 78
Location: Birmingham,England
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| Posted: Fri Apr 08, 2011 6:30 pm Post subject: |
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iNTERESTING INFORMATION, THANKS FOR POSTING. 
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1993(94 MODEL) K1100RS IN ASTRAL BLUE
2006 URAL 750CC DALESMAN SIDECAR OUTFIT,
RED AND CREAM. |
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Number 6
Flying Brick Rider
Joined: 05 Feb 2011
Posts: 481
Location: Paris area, France
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| Posted: Sat Apr 09, 2011 2:49 am Post subject: |
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How did you measure power/torque at clutch?
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I am not a number, I am a free man.
94 K1100LT |
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Rafal
Flying Brick Rider
Joined: 05 Jan 2009
Posts: 257
Location: Wroclaw, Poland
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| Posted: Sat Apr 09, 2011 1:51 pm Post subject: |
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Hello!
The calculation is done after maesuring transmissing drag during spin down of dyno. It its a green line on the plot. Whole maesuting equpment is a complicated, has pritty smart computer software.
Best regards
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Rafal
K1100RS is a real beast (in Marrakesh Red)
K75S is a real beauty - she has gone , but not to far .
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Number 6
Flying Brick Rider
Joined: 05 Feb 2011
Posts: 481
Location: Paris area, France
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| Posted: Sat Apr 09, 2011 2:51 pm Post subject: |
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I guess the clutch is depressed during spin down?
It seems reasonable even though it is assumed that the drag is the same whatever the torque comes from (engine or dyno).
It is not that complicated, I am sure you can compute the curves in excel from the rev vs time curve and some dyno constants.
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I am not a number, I am a free man.
94 K1100LT |
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Rafal
Flying Brick Rider
Joined: 05 Jan 2009
Posts: 257
Location: Wroclaw, Poland
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| Posted: Sun Apr 10, 2011 2:44 pm Post subject: |
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| Number 6 wrote: | I guess the clutch is depressed during spin down?
It seems reasonable even though it is assumed that the drag is the same whatever the torque comes from (engine or dyno).
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As long as a clutch does not slip it will not "consume" any power or torque. So the clutch is engaged through all the measurements. Friction in the transmission on another hand will reduce the output power but not torque.
| Quote: |
It is not that complicated, I am sure you can compute the curves in excel from the rev vs time curve and some dyno constants. |
Well there such tools using OBD and a computer to plot statistics during accelerating and spin down of a car.
Best regards,
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Rafal
K1100RS is a real beast (in Marrakesh Red)
K75S is a real beauty - she has gone , but not to far .
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Number 6
Flying Brick Rider
Joined: 05 Feb 2011
Posts: 481
Location: Paris area, France
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| Posted: Sun Apr 10, 2011 3:16 pm Post subject: |
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| Rafal wrote: | | Number 6 wrote: | I guess the clutch is depressed during spin down?
It seems reasonable even though it is assumed that the drag is the same whatever the torque comes from (engine or dyno).
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As long as a clutch does not slip it will not "consume" any power or torque. So the clutch is engaged through all the measurements. Friction in the transmission on another hand will reduce the output power but not torque.
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Then I think it is not adequate, because you are measuring the engine drag too. Drag reduces torque and power, power is the product of torque by rotation speed (rev/s), if you know one curve you can compute the other (that's what the dyno computer does).
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I am not a number, I am a free man.
94 K1100LT |
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