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Re: At what RPM is peak efficiency (torque) for M?
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Posted by agpilot on May 27, 2007 at 10:58:34 from (206.146.78.170):
In Reply to: Re: At what RPM is peak efficiency (torque) for M? posted by CNKS on May 27, 2007 at 08:33:45:
Hello CNKS: With all due respect, I don't remember reading anything where IHC stated that the M engine was designed for full throttle. As a backup to this I'll point out that rated PTO RPM of 540 is obtained well below max engine RPM. Why did they not use full engine RPM power to the PTO? I can't recall all the books or manuals I've read years ago but I'll stay with my impression that the M and most other 4 cylinder Farmalls were designed with a fairly Flat torque curve from half to full RPM. Most non-turbo engines have a peak in torque about 70 percent max RPM. An earlier 425hp Corvette I had peaked torque at 5100 but Redline was 6400. I've read many of your posts and you have a very good knowledge of Farmall but I'll hold to staying with saying the M has a very usefull and relative flat output power from above half RPM to almost full RPM. Another place I can see flat output in most 4 cylinder classic Farmalls is in a tractor pull. They hang tuff untill engine RPM goes below about half. Then they fade faster.
Most aircraft piston engines have published torque curves and fuel used vs power output etc for all comercial pilots to use. Pilots have to know this to plan a safe flight. If only we had this type of info on Farmalls like I've seen for low RPM non-turbo piston aircraft engines... Hopeing your having a great weekend... agpilot
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