Power At Rear Wheels

[Bob Bidonde]

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?

 

[sinbad339]

There are crankshaft hp/torque tables for a stock Model A engine and engines with different mods at https://www.modelaparts.net/dynosheets.htm/dynosheets.html

 

[Bob Bidonde]

Still looking for rear wheel power dyno test.

 

[Jim Brierley]

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.

 

[jetmek]

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

 

[Bob Bidonde]

Wow! A 25HP parasitic loss in the drive-line seems to be extraordinarily high, and would be terrible if the engine was stock.

 

[McMimmcs]

Please tell, what are you gathering these statistics for ?

 

[denis4x4]

Like Jim, I ran 60HP at the rear wheels on a chassis dyno at the Speedster Reunion in Lincoln.

 

[Big hammer]

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

 

[Synchro909]

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.

 

[Bob Bidonde]

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/

 

[Jack Shaft]

https://www.powertransmission.com/issues/0220/gear-sliding-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.

 

[McMimmcs]

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.