This must explain why when I shopped for a tractor, 25hp was a cutoff where prices change significantly.

I own one with a 35hp engine detuned to 25hp to legally bypass emission regulation. Just a fuel regulator screw turned down and timings modified. The exact same tractor with the screw turned up is about 10% more expensive and has a DPF which decreases reliability. The uptuned model also has an ECU and is harder to repair, whereas non-emission model can be (is) almost purely mechanical.

▲

LeifCarrotson 2 hours ago | parent | next [-]

I own one (a Kubota L3302) with a 33 HP engine, and there are a few guys around me who have 25 HP subcompacts (Kubota, Kioti, and JD) that do similar work to mine. It's astonishing how much everything around those 25hp tractors stinks of diesel. All the time. And how everything gets coated in a fine black greasy dust. I have very little of that.

I've read before that for the average homeowner, the particulate/NOx/CO emissions from their little 5 HP 4-stroke carbureted lawnmower and 40cc 2-stroke carbureted blower/stringtrimmer/etc are often greater than that of their 150 HP automobile - which has an ECU and oxygen sensors and fuel injectors and catalytic converters and so on.

The price bump to go up to the 33 HP engine with the emissions controls was significant (much more than the 8HP performance bump), and every 30 hours or so it wants to run a "regen" cycle which always seems to be at the worst possible moment in my workload, but I feel a lot less guilty about running it knowing that my exhaust isn't nearly as bad for the environment and for my lungs as it could be at a slightly lower performance tier.

	▲	bombcar an hour ago \| parent [-]
		I noticed this https://toolguyd.com/makita-xgt-motor-unit-launch/ and wonder if it's going to go anywhere - there are obvious advantages to "electric" but it's a hard sell to those already using existing equipment.

▲

mindslight 3 hours ago | parent | prev [-]

> has a DPF which decreases reliability

Also makes it so you don't have to avoid breathing the cloud of smoke when it starts up or grunts, nor get black shit caked all over your loader frame. Part of me wishes I bought >25hp for the emission system. Of course it's natural to always want more tractor than you have.

▲

bluGill 2 hours ago | parent [-]

I keep waiting for the electric tractor. In the 25-30 hp class you can get reasonable runtime from a battery. Sure a Tesla can run for 4 hours on a full charge - but on the highway it is likely only using about 25 horsepower of fuel, it would run for much less time if continuously using all of the several hundred horsepower it can deliver on a track.

As a small land owner I don't think I could find a way to put 2 hours on my tractor in a day, so that I need to recharge overnight after 2 hours of use isn't even a loss. And not having to deal with diesel would be a big savings.

	▲	seany an hour ago \| parent \| next [-]
		Depending on what is being done; it would seem like a 25-50hp electrical system with a little 5-10kw diesel generator would work great. You're almost never running these things at truly 100% duty cycle, so you just need a way to bank the power. Edison Motors up in Canida is going this with OTR trucks for the logging industry.
	▲	mindslight 2 hours ago \| parent \| prev [-]
		For sure. I often think about this when using my tractor to clean up trees I've taken down, for which there is a lot of grab, lift, hop off, chainsaw, repeat. Or really any kind of hoisting/positioning where the engine is just sitting idle to occasionally move hydraulics. Via HN a little while back, I came across a guy importing electric versions of things like front loaders, forklifts, excavators, etc. Intriguing, but less compelling if you have to buy 2-4 pieces of equipment rather than one jack-of-all-trades. Although if I were going to have to maintain multiple pieces of equipment, I'd definitely prefer them to be electric! I can end up putting in more than 2 hours a day, but I think the math still works out for most homeowner use. I think the main thing it doesn't work out great for is long dirt-engaging operations like for actually farming a large field. But it's not like the subcompacts are really made for that either, and they're quite popular. It would be really interesting to see what could be done with linear actuators instead of hydraulics, too. Although I suspect heat dissipation would be a problem, and working on hydraulics is pretty cool in and of itself.