I should add to my previous post: The other concern would be the slope characteristics of the Honda engine's torque/HP curve. A typical tractor engine might put out its full RPM at, say, 2200 RPM. If you drop it to 1600-1800 RPM, the torque/HP curve are probably such that it's still putting out at least 70-80% of its full HP, and thus still has a good amount of torque for pulling wagons, field work, or any of those other jobs where we typically don't wind our tractors right up to full PTO RPM.
The curve of most automotive engines, however, would be quite different. Even if they put out their max HP at 2200 RPM (most would be much higher), when you drop it to 1600 RPM you're likely down to 50% or less of your full HP.
There's no magic between HP and torque - it's a linear relationship. The same HP at the same final output RPM will produce the same torque. It's rather that the way the engine's optimized/designed will vary at what RPM you see full HP/torque. And because HP is proportional to toque by an inverse unit of time (550 ft.lb. per sec.): to put out 50 HP and 5000 RPM means very little torque from the engine, while 50 HP at 2200 RPM means a lot more torque at the engine.
In summary: If you gear the 50 HP at 5000 RPM Honda engine down to 100 final output RPM output through some sort of transmission, and gear the 50 HP at 2200 RPM tractor engine down to 100 final output RPM through a different transmission, the output torque will be identical. But what happens when you throttle them down a little will vary greatly from engine to engine.
This post was edited by DanielW on 12/01/2023 at 10:24 am.
Upload one or more videos to your post. Photo and video filesizes should be less than 5MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
... [Read Article]
Latest Ad:
Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
