Horsepower?

[BigBill]

The fcub is 9 hp?
The int154 is 15.4 hp?
The int 185 is 18.5 hp?
The int184 is 18.4 hp?

Correct? The difference is the dome pistons in the number series tractors? What else is different.?

[staninlowerAL]

Head modified slightly, governor changed, RPM increased, carb & intake changed.

[Eugene]

Advertising, rating the tractor at lawn mower/engine horsepower instead of drawbar horsepower.

[john2189]

Advertising, rating the tractor at lawn mower/engine horsepower instead of drawbar horsepower.

What is the difference in drawbar and engine hp?

[Eugene]

Advertising, rating the tractor at lawn mower/engine horsepower instead of drawbar horsepower.

What is the difference in drawbar and engine hp?

Drawbar horsepower = how much can the tractor pull from the drawbar. Engine horsepower, is usually only the engine rated without any attachments such as fan, hydraulic pump, generator/alternator, or transmissional gearing.

On the 9 HP Cub Bill listed, the drawbar horsepower is 9.75 and 13 HP on the engine.

The listing's Bill provided indicates a higher horsepower for later tractors. Most of the horsepower came from increased RPMs and how the tractor is advertised.

[inairam]

HP is a calculation using torque and rpm. Most of the increase in hp is from the increase in rpm over the years. Early cubs were rated at 1800 and the number cubs were 2200-2400 using a different governor really basically the governor from the stationary engines.

The newer cam and dome pistoned pistons were added in 1968 before the number cubs. The higher rpm means high PTO RPM which is better for grass cutting which is more of what the cub was marketed for late in the 60s and 70s.

From a post in 2005

" IH brochures and found one that covered Engines and Power Units (Form # A-490-MM. 6-17) that list the U1 (Cub) power unit as having 16 horsepower "at rated governed engine speed of 2500 r.p.m."" The brochure referenced was from 1949 so very early on.

http://www.farmallcub.com/phpBB2/viewtopic.php?t=6957

Granted these engines were not suppose to run 2000 -3000 hours a year like the tractors of the day. But most of our cubs today are not running those hours either. In 1949 those engines were using the same internal parts as the cub engines except for the governor weights.

You do not have to run that high - you still have the throttle to set RPM. I have a few Cubs with hot governors for mowing. The 400-600 rpm makes big a difference in the deep stuff. You just have to use judgement and use it if you need it not every time you get on the tractor.

[Eugene]

Charts were published with the industrial sales information. This is what was published for a Lo-Boy in '62, stripped engine running on 91 RON gasoline (about 86 or 87 octane on today's gas pumps). (Reading best I can from a chart.)

RPM . Torque . hp
600 -- 32 ----- 3.5
800 -- 34 ----- 5.25
1000 - 36 ----- 7
1200 - 38 ----- 8.75
1400 - 39.5 --- 10.5
1600 - 39.75 - 12
1800 - 39 ----- 13.5
2000 - 37.5 --- 14.5
2200 - 36 ----- 15.25

[BigBill]

When I had my race car on the full body dynamometer it had 299 hp at the rear wheels at 6,700 rpm in 4 th gear. We lose hp through the drive train. The engine had 400 hp. It takes power away to turn the drive train.

Doesn’t the super A govenor fit the c60?

[outdoors4evr]

And this is how we get promoted to the thread "Has anyone killed their cub"

[BigBill]

So we really have no rear wheel hp on a dynamometer test on the cubs? It’s pto or drawbar hp?

[MiCarl]

So we really have no rear wheel hp on a dynamometer test on the cubs? It’s pto or drawbar hp?

I would think rear wheel and drawbar hp would be about the same.

What matters is how much power gets to the implement (drawbar or PTO), not how much is at the crankshaft (or wheels, for that matter).

[BigBill]

The real Pulling power is at the rear wheels. Rated through the tractors gearing through the final drives.

[Eugene]

Internet search for how the Nebraska Tractor Testing Station determines drawbar horsepower.