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Old 01-26-2021, 11:00 AM   #1
Bob Bidonde
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Default Power At Rear Wheels

Does anyone have the rear wheel power of a Model "A" from a dynamometer test?

Also, does anyone have engine dynamometer test results of power at the flywheel?
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Old 01-26-2021, 11:19 AM   #2
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Default Re: Power At Rear Wheels

There are crankshaft hp/torque tables for a stock Model A engine and engines with different mods at https://www.modelaparts.net/dynoshee...ynosheets.html
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Old 01-27-2021, 11:01 AM   #3
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Default Re: Power At Rear Wheels

Still looking for rear wheel power dyno test.
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Old 01-27-2021, 02:30 PM   #4
Jim Brierley
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Default Re: Power At Rear Wheels

I don't have one for a stock engine but years ago I dynoed my pickup with a mild 2-port Riley. It put 60 HP to the wheels. It was an electric dyno, so I could power the vehicle using the dyno's motor. It took 25 HP to turn the trans and rear end, so about 85 HP at the flywheel.
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Old 01-27-2021, 03:12 PM   #5
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Default Re: Power At Rear Wheels

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Originally Posted by Jim Brierley View Post
I don't have one for a stock engine but years ago I dynoed my pickup with a mild 2-port Riley. It put 60 HP to the wheels. It was an electric dyno, so I could power the vehicle using the dyno's motor. It took 25 HP to turn the trans and rear end, so about 85 HP at the flywheel.
All it takes is cubic dollars🤑👍
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Old 01-28-2021, 12:36 PM   #6
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Default Re: Power At Rear Wheels

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Wow! A 25HP parasitic loss in the drive-line seems to be extraordinarily high, and would be terrible if the engine was stock.
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Old 01-28-2021, 12:50 PM   #7
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Default Re: Power At Rear Wheels

Please tell, what are you gathering these statistics for ?
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Old 01-28-2021, 01:08 PM   #8
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Default Re: Power At Rear Wheels

Like Jim, I ran 60HP at the rear wheels on a chassis dyno at the Speedster Reunion in Lincoln.
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Old 01-28-2021, 03:23 PM   #9
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Default Re: Power At Rear Wheels

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Wow! A 25HP parasitic loss in the drive-line seems to be extraordinarily high, and would be terrible if the engine was stock.
It takes hp to move 600w oil 🙃
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Old 01-28-2021, 03:50 PM   #10
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It takes hp to move 600w oil 🙃
It sure does. That thick oil is like a hydraulic damper. I run lighter oil in the diff for that reason but stick with the heavier oil in the cog box. Light oil makes gear changing more difficult.
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Old 01-29-2021, 12:31 PM   #11
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Default Re: Power At Rear Wheels

McMimmcs, I am the Technical VP in my local "A" club, and I give slide presentations at every club meeting. I concentrate on info not previously published, so I collect data and stats wherever I find stuff that passes my engineering giggle test. If you would like to see some of my presentations, look here
https://www.modelalongisland.com/
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Old 01-29-2021, 12:54 PM   #12
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Default Re: Power At Rear Wheels

https://www.powertransmission.com/is...ing-losses.pdf

This is very techie but if you read between the lines you can see where Jim's hp losses are generated from flywheel to road wheels. Sliding gear teeth design even has a factor, spur cut A transmission gears have a higher loss than later helical cut gears.. even oil has a friction element to it.
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Old 01-29-2021, 01:05 PM   #13
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Default Re: Power At Rear Wheels

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Originally Posted by Bob Bidonde View Post
McMimmcs, I am the Technical VP in my local "A" club, and I give slide presentations at every club meeting. I concentrate on info not previously published, so I collect data and stats wherever I find stuff that passes my engineering giggle test. If you would like to see some of my presentations, look here
https://www.modelalongisland.com/
Thank you, I was wondering if my A.’s needed some kind of adjustment.
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