Engine H.P.

[Rocky Hoffler]

Looking at Kioti it seems some models run same engine with varying horsepower depending on model what is being done to vary horsepower.

 

[nybirdman]

This done by most of the manufacture's,same block different tuning. Also common in the marine industry.

 

[DK35vince]

This done by most of the manufacture's,same block different tuning. Also common in the marine industry.

Common on heavy trucks also.

 

[IrishStout]

I've noticed the same thing. One 40hp model will have more pto hp than a higher priced 47hp model. Curious for sure.

 

[PhantomOfHeat]

I've noticed the same thing. One 40hp model will have more pto hp than a higher priced 47hp model. Curious for sure.

That is probably the difference in transmissions, the HST will have less PTO power than a shuttle version. I believe some models have 3 different transmission options.

 

[CobyRupert]

I thought things like adjusting amount of fuel and air that gets into engine by changing injector sizes, turbo (or boost) and intake sizes, fuel pump flow, etc.. was the "tuning"?

 

[PhantomOfHeat]

You are correct with "tuning" it is mostly controlled by the computer. I was referring to why an engine with more HP might have the same or less PTO HP as an engine tuned for less power.

 

[finn1]

You have to look at the individual specs. Sometimes it’s simply changing the pulse width command from the ecu. Other times turbochargers and intercoolers are added, along with different injectors or piston bowl configurations.

Sometimes the low power version of a tractor falls in a different emission class, and a cheaper (non-electronic) fuel system is specified.

The general answer to the question is “it depends”.

In general, though, manufacturers try to minimize engine hardware variation across the models to simplify manufacturing.

 

[Walter L]

Looking at Kioti it seems some models run same engine with varying horsepower depending on model what is being done to vary horsepower.

Rocky the LS tractors use the same engine 114.7 ci in 2019 from 35 to 55 hp with the same size turbo just a different computer program and i would suspect the same on Kioti.

 

[JimR]

On the NX series Kiotis they all use the same engine, same injection pump, same injectors and turbo. The HP difference is all regulated by the ECU and fuel delivered to the cylinders. Nobody yet has found a way to crack it or come up with a chip to over ride it. If you do this to your tractor your warranty is null and void.