Re: At what RPM is peak efficiency (torque) for M?

Posted by Cedric on May 28, 2007 at 04:09:16 from (210.54.69.47):

In Reply to: At what RPM is peak efficiency (torque) for M? posted by M.Rad. on May 26, 2007 at 22:18:32:

I have a 1971 reprint of the Blue Ribbon Service Manual for the H & 4 Series tractors which also includes the U-4 Power Unit.
As part of the description for the Power Unit there is a graph showing performance curves. Maximum torque of 110 lb.ft. took place at 1200 rpm's at just over 25 hp. As agpilot suggested, the torque curve was fairly flat, ranging from 90 lb.ft. at 600 rpm, up to the maximum of 110 then back to 90 lb.ft. at 1800 rpm.
As far as I'm aware the U-4 Power Unit and H engines are identical so these figures should also be applicable to the H.

If you can get hold of a Blue Ribbon Manual for the M it should have the I-6 Power Unit in with similar information.

Hope this might be of some help. Sid.

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