HP Rating for D1105 engine

[Soaring high]

Thanks PSDX......I went to the parts manual and looks like the injectors. Crank, flywheel, cylinder head, injection pump all the same. The injectors show a different part number as between 25hp and 28hp, also some models show different governor part number. Anyways, thank you so much for directing me to this site. Once the rtv1100 comes in I can just compare part numbers to my zd28 and get down to specifics. Thanks again.

Hey mikeyd.. been trying to get some info on the x1100c for more ponys have a 2021.. just wondered how you made out with injectors n such please reply thx..

 

[Paystar]

I have two versions of the D1105. One in my new RTV-X1100C, the other in my B2620. Not important to this thread, but wanted to mention something I notice. Both my machines run strong, but I notice my B has almost no exhaust smell, but the RTV exhaust smells like an old big rig. No smoke but it has a diesel odour to the exhaust.
Maybe due to the different tuning between them?

All I know is I like having the matching engines because most of my filters are all the same between the two. That's why I want to get a U27 excavator....it also uses the D1105.

 

[Soaring high]

I have two versions of the D1105. One in my new RTV-X1100C, the other in my B2620. Not important to this thread, but wanted to mention something I notice. Both my machines run strong, but I notice my B has almost no exhaust smell, but the RTV exhaust smells like an old big rig. No smoke but it has a diesel odour to the exhaust.
Maybe due to the different tuning between them?

All I know is I like having the matching engines because most of my filters are all the same between the two. That's why I want to get a U27 excavator....it also uses the D1105.

Hey psystar.. thx for tuning in.. how is your x1100c power wise I would to gain those 3 ponys we where talking about.. if any info please share thx..

 

[Milo]

There was discussion about Kubota lowering HP ratings back in 2019. What year did you buy your ZD28?

I bought my bx23s last year. The brochure listed the horsepower at 23. I researched the stand alone D902 engine on Kabota's site and it was listed as 21.6. As far as I could tell the engines were identical. I'm guessing Kubota needed to get their info on the engine straightened out.


The same engine can be rated for different outputs, there are 4 ratings they can use also (gross intermittent, net intermittent, gross continuous, net continuous) and there are different ratings based on rpm and application.

Since it appears the PTO hp stayed the same I wouldn't worry about it, although I am curious what brought about the change.

 

[Snobdds]

Always go back to physics. A diesel motor's variables are air and fuel, if the engine architecture is the same.

I know on the massey (Iseki) engines, they use the same engine in the 25 and 23 horsepower versions. The 25 hp spins faster, 3k rpm, to make the rated power, but there is more. The differences are in the fuel shims on the injector pump and governor (2600rpm vs 3000rpm). The 25hp is fed more fuel, which gives it more power. There is some gearing differences in the HST to account for the RPM's but that's it.

It's the fuel changing the power.

 

[Paystar]

Hey psystar.. thx for tuning in.. how is your x1100c power wise I would to gain those 3 ponys we where talking about.. if any info please share thx..

I'm only at 620 feet above sea level, but as far as power.....just know they will lose lots of speed, but they never quit pulling. Even when it bogs down, it will still climb idling.

It's hard to tell the steepness in a pic, but my RTV will run 25/26 MPH on the road, verified with my Garmin GPS.
On this hill in my back yard it will run drop to 10 MPH empty, 9 with AC on, or as low as 7 with 2 buckets of pit run gravel from my B2620 in the bed and AC on high. But as soon as it drops if I lift on throttle pedal it picks right back up.

So if you are an ATV trail rider that likes to go fast, you will be disappointed. But me, having done all that and having gone fast racing motorcycles until 2003, I now take the RTV before I ever get on my atv's. I go cruising the trails, I get to see the scenery at lower speeds, it climbs any hill at idle without having to rev and attack the hill, I'm comfortable and clean in the cab, and what burns half a tank of fuel in my atv's, the RTV doesn't even move off full on same loop.

Last weekend I did a test too. I ran up this same hill again with my Boss vee plow on (400 pounds) and a full load of maple hardwood blocks in the bed, and again.....9 MPH up hill. I think it will do ok for me plowing this winter.

But as happy as I am.......if it could top out at 30 MPH, it would be absolutely perfect to me.

 

[Paystar]

I can add also....in this pic where I haul gravel up my bush roads, it will make trips WAY faster than I can make one bucket at a time with my B2620 tractor.

 

[River Valley Landscaping]

I would think the different hp ratings would be mostly for emissions reasons depending on what category of machine it is put in. Similar to the ford powerstrokes that get extremely governed and derated hp and torque when put in a drw dump truck configuration verses a srw or drw pickup truck model with the same engine. I have heard some of the reasoning behind it is because the heavier the truck is, the more likely someone would blow the transmission if all the hp was available. The manufacturers like to play with the torque curves keeping a f650 to a few hundred horsepower and bumping the torque up meanwhile a f350 pickup can be pretty close to double the horsepower in some cases.

 

[Soaring high]

Yeah, that's what I am thinking too, maybe just different injectors. My dealer says he can cross reference the injector part numbers once thr RTV1100 comes in. If it is only the injectors that is a real inexpensive way to pick up a 12% gain in power for the RTV.

 

[Soaring high]

Gooday Mike.. I was wondering if you ever put different injectors to gain horsepower.. plese reply thx