Nebraska test 386 showed 9.23 belt hp and 8.3 drawbar hp in 1947.
It also showed a FLGS of 1600, so when you read down the table to 1724 rpm, the net belt hp is only 2.25. This shows the governor at work, cutting the fuel back and reducing horsepower above FLGS.
If one moves the FLGS up by 200 rpm, you will get the benefit of the HP increase between 1600 and 1800 rpm, which looks to be between 1 and 2 hp, but you will also get the benefit of being fully in the throttle and fully loaded by the time the load pulls the engine back to peak torque, which is around 1600 rpm. You will pull through more rough spots than you otherwise would.
I see this on the loboy ('65) vs the Fcub ('63 admitted it's tired), but the offset loboys had a higher no-load speed and thus higher FLGS than the Fcub of the same vintage.
The loboy labors less under load and recovers faster.
You should be able to turn up the no-load speed without changing any springs and since it doesn't have a mechanical fuel rack, you shouldn't need any other adjustments. This is governor math that I learned years ago at Cat....
Much of the difference between a long stripe cub and the rest of the fleet is just that - a much higher FLGS - up in the 2400 range, which significantly widened the power band. The bulk of the rest of the difference is due to the higher compression afforded by the domed pistons. Compression ratio=hp.
Last edited by ntrenn on Tue Nov 13, 2012 1:07 pm, edited 1 time in total.