I doubt it, I would expect the larger engine to have a better working torque curve and the ability to lug and pull when the smaller displacement will bog down and stall out.
I'd expect the torque curves to be similar in respect to their peak. IE: percent torque rise vs RPM.
In other words.....if RPM drop 10% and torque rise is 15%....I'd expect a similar curve profile for both engines....
For example....kubota D1105 (68CI 25hp engine) vs kubota D1705 (100CI 25hp engine). These are used in the
B2601 and
L2501. BOTH the same HP spec
The
B2601 engine is rated at 25hp/3000RPM and peak torque of 52ft-lbs at 2200rpm
The
L2501 engine is rated at 25hp/2200rpm and peak torque of 72ft-lbs at 1500RPM.
Both engines have the peak torque occurring at ~70% of rated (max) engine speed
While operating at 70% of max engine speed (where peak torque is) BOTH engines are still producing ~20-21HP.
While operating at max (rated) engine speed....the
B2601 retains 85% of its peak torque #...which puts it at 44ft-lbs. The
L2501 retains 81% which puts it at 59ft/lbs
At ~60% the rated engine speed.....
The
B2601 engine @ 1800rpm is making 52 ft-lbs and 18HP
The
L2501 engine @ 1400rpm is making 70ft/lbs and 18HP.
Look at the graphs.....compare the numbers. YES, the
L2501 engine produces more torque. But the 2601 can match the work load by making more RPM's. Everyone seems to forget that you can MULTIPLY torque through gearing. But you CANNOT change horsepower through gearing.
To put it quite simply.....The
L2501 makes more torque.....but the
B2601 makes proportionally more RPM's. All you gotta do is gear them equivalently and voila.....darn near identical curves.
