My garden tractor is 26hp, my scut tlb is 22.5, how come?

[WinterDeere]

Not to de-rail even farther, but I love the look of some of those new Mazda's, but the three acquaintances who own newer ones all tell me they're the worst and most unreliable car they've ever owned. What gives? I was totally bummed... they're gorgeous!

 

[goeduck]

Our 1983 240D Benz would have been great if it had as much as 100 hp, and the turbo ones with 120 were great.

My 1983 240D had 67 Horses when they were all young and living. I need to get that thing running again if any are still alive and kicking. I wonder if it can get out of its own way on the road these days. Not like it ever could. :laughing:

 

[the old grind]

If you increase torque at the same rpm, you increase hp proportionally.

If you increase rpm at the same torque, the hp increase is exponential.

Yard machines use rpm to produce hp from comparatively meager torque.

Tractors use gears to harness torque at low rpms most conducive to longevity. btw, dedicated mowers don't see near the variety of load/work demands or typical operating rpm ranges as most CUTs/SCUTs.

Anyway, I don't run my SGE mowers at much less than rated rpm other that to travel or load.

As for more is better when it comes to hp, I'm imagining paying for a few extra horses at sale, and in fuel use. Not needing to harness all of it, and to save fuel I operate at lower rpm. Engine loads up and regen cycles are more frequent, and ..?

I mow with the biggest mower (60" 28hp vs 42" 13hp) but do tractor chores with the 'smallest' of three CUTs that'll do a job. (26hp vs 30 & 35)

 

[GeneV]

Not to de-rail even farther, but I love the look of some of those new Mazda's, but the three acquaintances who own newer ones all tell me they're the worst and most unreliable car they've ever owned. What gives? I was totally bummed... they're gorgeous!

There's a lemon or 3 in every bunch I suppose, but alls I know is Mazdas are rated pretty good by Kelley's, and me personally, we had great luck with them, never an issue with all 3 we had. Our current one is a 2017 CX5.

 

[goeduck]

Mazda has had very good styling as well. For a long time now in my opinion. I do not have one but I think they look good.

 

[aczlan]

If you increase torque at the same rpm, you increase hp proportionally.
If you increase rpm at the same torque, the hp increase is exponential.
Yard machines use rpm to produce hp from comparatively meager torque.

Exactly, Horsepower is Torque (ft-lb) x RPM / 5252
As such, a engine that has 100 ft-lb of torque at 1000RPM has 19.04HP.
The same engine with the same 100 ft-lb of torque at 4000RPM has 76.16HP.

Aaron Z

 

[cdaigle430]

I'm sure this has been answered before, but just gimme the quick&dirty. Why scuts are powered less than some garden tractors?

One thing I would like to add to this question. Doesnt the way power is transferred also have something to do with the engine HP? In my tractors case alot of the grunt comes from the pump right? Of course you need the correct amount of HP to turn that pump under loads at a specific RPM. I bet my Husvarna 24hp engine will do just as well as the diesel engine in my tractor on the HP rating. I do see a problem and that is my diesel is water cooled and more efficient to handle low speeds when little air moves. At the same time diesels are better under long loads. Air cooled gas engines will overheat and burn gas faster. Air cooled gas engines just dont have longevity.

 

[Richard001]

One thing I would like to add to this question. Doesnt the way power is transferred also have something to do with the engine HP? In my tractors case alot of the grunt comes from the pump right? Of course you need the correct amount of HP to turn that pump under loads at a specific RPM. I bet my Husvarna 24hp engine will do just as well as the diesel engine in my tractor on the HP rating. I do see a problem and that is my diesel is water cooled and more efficient to handle low speeds when little air moves. At the same time diesels are better under long loads. Air cooled gas engines will overheat and burn gas faster. Air cooled gas engines just dont have longevity.

Well I guess its how you use it. The gas engine you are using is running at about 3,600 RPM. The diesel is maxed out at about 2,300 RPM

As my dad used to say, "things that go fast, don't last"

Richard