International Farmall 656 questions

(quoted from post at 09:33:00 06/11/19) I am not an International expert, but I believe the lever you are referring to is the "Torque Amplifier". It is a 2 speed shift on the go that doesn't require using the clutch. It effectively gives you 10 forward speeds and 2 reverse.

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(quoted from post at 11:34:37 06/11/19) Do a search on "TractorData.com" then search for FARMALL, and a list of all Farmalls should appear,
highlite 560 and a general information page comes up. Under the picture of a 560 Farmall at the top will
be several sub-catagories, like Engine, Transmission, Dimensions, Photos, and TESTS. HIT TESTS. The
results of each Nebraska tractor test of a 560 Farmall will be listed, one for gasoline, diesel, and LP
gas, towards the bottom is a link to the actual final report published by the Nebraska tractor test lab.
In the late 1950's when the 560 was tested they did a peak engine torque test. Typically IH engines did
really well on this test. The technical name for this is "Torque Rise", as the load increases and the
engine pulls down in rpm it pulls harder, torque actually increases 20 to 30%, sometimes 40%. It
eliminates pulling the Torque Amplifier lever back to the low side. The 4-cylinder gasoline engines
produced before the 560, the 450 and 400 models were amazing, rated rpm was 1450 rpm, torque peak was
750 to 770 rpm, and the torque produced at 750 rpm was substantially higher than the torque at 1450.

Combine an IH engine with the Torque Amplifier and it was surprising the work you got done in a day.

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(quoted from post at 20:24:48 06/11/19) The concepts of torque and power cause a lot of confusion. You can't say that an engine has more of one than the other since they are different things with different units of measure. As
the equation someone else showed indicates torque is an element of power along with rotational speed. In order to do work with an engine you must apply a force (using torque) and deliver
it at some rate (using rpm). Either element by itself can do no work and this is why power is the true measure of an engine's capability. The other thing to keep in mind that the "apply
a force" stated above means at the point of doing work, not at the crankshaft. For drawbar work the point of doing the work is where the tires meets the ground. In this case the maximum
torque rating of the engine is irrelevant since for any given vehicle speed the greatest possible axle torque (and thus the force at the ground) is obtained when the engine is operating at
its power peak, not the torque peak, and is taking advantage of the torque multiplication in the transmission. It is for this reason that tractors and other machines are rated by power
and the torque rating is rarely listed. (Pickup trucks are an exception to this but that is largely a marketing thing.) The engine speed at which peak power is produced tells you whether
the engine is a low speed "lugger" or a high speed "racer". If peak power is in the 1800-2500 rpm range, which includes most all tractors, it by definition means that the engine must be
able to deliver high torque in the 1000-1500 rpm range but the thing to remember is that it is the combination of torque and speed (in other words, power) that gets work done.

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