Dyno Testing a Numbered Lo-Boy

[BIGHOSS]

Has a 184 Lo-Boy ever been tested to see what the actual HP is compared to a regular Cub?

Whoops, maybe this should have been in the Lo-Boy forum. Mods can move it if necessary.

[Bob McCarty]

Ron, I think Rick Prentice did several at the Tug at Bigdog's and maybe CI. Pretty sure he did Larry Dotson's, but I don't remember which # it was. There didn't seem to be much correlation between the dyno results and the Tug results. That's not your question though.

Bob

[RaymondDurban]

Check here:
viewtopic.php?f=1&t=42230&p=349458&hilit=torque+curve+184#p349458

[BigBill]

I put my drag race car on a full body dyne and had 299HP @ rear wheels at 6,800rpm. My point is I lost 100hp through the drive train.
Using the power through the finals could make a difference. The final drives are like a torque multiplier. My point is there's a 100hp difference between the engine dyne and the full body dyne that's a 25% difference. To load the drive train properly it needs to be in third gear or it's highest gear.

A cub with turf tires would work on a full body dyne.

I built dynamomenters at Otis ever
Elevator which one dc 269 motor was equal to 28 427 Chevy engines torque wise. The elevators in the world trade center had the bigger 369 dc motors. You could almost walk uprite when the armature was out through the field coils. Your looking at 35k to 55k pounds of machinery. We coupled them throughout a 200,000 inch pound torque meter. We would load the newly designed state of the art AC MOTORS against the older DC motors to check the torque specs. They found out that a smaller sized AC motor had the equal power factor but the smaller motor came with a price it ran hotter. The development of the AC MOTORS in the industry has come a long way.

[BigBill]

Now in building two stroke dirt bike engines without the valves the early piston ported engine you had a faster top end bike I could make the envelope of the power band wider. But you hand less bottom end which was the norm anyway but top end you had a 120mph on your wrist if you wicked it good. Then the exhaust port was lowered by a rotating valve or guillotine which increased more bottom end but it lowered the top speed to 85mph if that. It's a give and take situation.

Now I can port a four stroke engine that will respond to the increase in throttle before you rev it up it responds that quickly to the throttle movement. For cars with the weight it's ok but with a tractor it might throw us off. I can make more power but the governor needs to be reworked too. One thing or one change may not make the difference.
I install headers and the dual exhaust on a standard shift 4x4 truck and noticed no change. The gearing his the change. Now I install the same exhaust headers and system in an automatic tranny 4x4 truck and can feel the difference right away.