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1980 KZ13 Project 1 month 3 weeks ago #27722

  • Phil
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Bucko wrote:

Phil wrote: Bhp is generally measured at the rear wheel on dynos.


BHP can't be measured at the rear wheel (RWH) as there's no easy way to interpolate the losses between the BHP and RWH


So where is it measured then?
Only dead fish go with the flow

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Last edit: by Phil.

1980 KZ13 Project 1 month 3 weeks ago #27723

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Kawboy wrote: I guess the bottom line on the "Horsepower" issue is Divman sent it in and had it dyno'd and the results reported back was "131 BHP". So no one's going to go to the trouble of trying to subtract any losses. and without really special tooling, no one's going to measure the output at the crank, so the results would have been at the Rear Wheel. Strap it down, run it up, take a reading and report to the customer.


Most dynos measure rear wheel horse power (rwhp), a calculation can be made for losses in the transmission, final drive etc. & a crank figure can be obtained that way if required.
Lots of manufacturers gave a crank figure, which was measured with just the engine secured to a test rig & the dynamometer attached to the crankshaft directly to give a crank hp reading. Kawasaki quoted the KZ1300 at 120 bhp, which was a crank figure. At the rear wheel with all the losses they generally measure somewhere between 95 to 100 bhp. The ZG1300 with the DFI engine was quoted by Kawasaki to produce 130 bhp at the crank, they generally produce somewhere between 100 to 105 rwhp. My question to Divman is "was the power he quoted measured at the rear wheel or were calculations made after measuring the rwhp to obtain the bhp reading at the crank?"
Only dead fish go with the flow
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Last edit: by Phil.

1980 KZ13 Project 1 month 3 weeks ago #27724

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Hi Phill
You are absolutely right !
The figure given through is measured at crank.
I would be very disappointed in myself if my technician could not operate or understand my AWD dyno that was fitted 3 mnths ago at a cost of 1.4 Million Rands.
LOL !

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1980 KZ13 Project 1 month 3 weeks ago #27726

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Divman wrote: Hi Phill
You are absolutely right !
The figure given through is measured at crank.
I would be very disappointed in myself if my technician could not operate or understand my AWD dyno that was fitted 3 mnths ago at a cost of 1.4 Million Rands.
LOL !


That is one very healthy 1300 you have there then B)
Only dead fish go with the flow
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