Dyno Day. - Page 3

fnfalman · 06-05-2008, 04:41 PM

Quote:

Originally Posted by Ebbs15

so then how did they caculate the hp with out knowing the torque?!

That's why the dyno has the weighted drum that your bike's rear tire turns. That drum is weighted and calibrated. How fast it turns is calculated into horsepower. That's why it doesn't require your bike to have the RPM (aka attaching the clip to the sparkplug wire) to calculate for horsepower. However, it doesn't KNOW how fast your engine is turning, so if you were to want torque measurement then it needs to know your RPM via the spark plug connection thingie so that it can calculate backward from horsepower reading at the rotating weighted drum against your engine's RPM in order to calculate for your bike's torque.

Mr Lefty · 06-05-2008, 04:56 PM

intresting... I know when I did my dyno runs they had trouble getting my tank off and said with out the RPM's they couldn't do anything... could just be diffrent dyno

good to know fnfalman

fnfalman · 06-05-2008, 06:45 PM

Quote:

Originally Posted by Ebbs15

intresting... I know when I did my dyno runs they had trouble getting my tank off and said with out the RPM's they couldn't do anything... could just be diffrent dyno

good to know fnfalman

Could be. I'm only familiar with the Dynojet dyno, and I know that they don't need your bike's RPM to measure horsepower.

Cutty72 · 06-05-2008, 04:34 PM

I'm guessing they get it somehow off of the speed.

Mr Lefty · 06-05-2008, 04:37 PM

... huh... so you going back tonight to do it again?

Cutty72 · 06-05-2008, 04:40 PM

Quote:

Originally Posted by Ebbs15

... huh... so you going back tonight to do it again?

Provided the thunderstorms and tornado's hold off...

06-05-2008, 04:56 PM	#2
Mr Lefty TWFix Legend Join Date: Feb 2008 Location: Denver CO Moto: 01 BMW F650GS Dakar Posts: 15,677	intresting... I know when I did my dyno runs they had trouble getting my tank off and said with out the RPM's they couldn't do anything... could just be diffrent dyno good to know fnfalman

06-05-2008, 04:37 PM	#5
Mr Lefty TWFix Legend Join Date: Feb 2008 Location: Denver CO Moto: 01 BMW F650GS Dakar Posts: 15,677	... huh... so you going back tonight to do it again?