I'm pretty sure the Scag engineers took power requirements into account when they chose the 25 hp Kubota engine.
If you're worried about the 25 hp diesel rating as compared to the 35 hp gas engine rating, don't be. This engine operates at lower rpms than the gas engine. It will have more torque than the gas engines. I think the engine in my tractor is rated at 27.5 PTO hp. If I were to replace it with one of those 35 hp V-twin gas engines, I guarantee it would be a downgrade in performance. It powers a 6-foot mower with ease and I don't even run it at full power. IIRC, when I bought the mower, the salesman said my tractor could power a 7-foot mower if I wanted--and that's at 27.5 hp.
Yeah, I know but it really isn't a good comparison.
If horsepower alone were a good way to compare engines, it would make no difference if you put a 300 hp L-10 Cummins or a 300 hp small block Chevy in an 80,000 lb tractor trailer.
The first generation Dodge Cummins pickups proved it, as well. I think the first generation Dodge Cummins was only rated at 140 or maybe 175 horsepower but would easily outpull gas engines with much higher hp ratings.
I don't even know what Bahia grass is, but I'll bet the diesel cuts it better than a gas engine. It has more torque and that's what does the work.
As far as weights go, the 61" diesel model is shown as being 95 lbs heavier than the gas model. For some strange reason, the 72" model is shown as being 255 lbs heavier than a gas model. That doesn't make any sense, because it's the same engine for both models.
I got those numbers from the owner's manual that is downloadable on the Scag website.
As to whether the additional weight hurts or helps, I can't answer. It's over the drive wheels which I would think would help unless you get in really soft stuff.
While we're spending your money, an option I'd recommend would be the air filter minder system. It's electronic on the Scag. It will pay for itself pretty quickly by preventing you from replacing air filters more often than is necessary. The air filter element on my Kubota is about $30, so I like to get all the good out of them I can. The air filter on a diesel is a critical element and diesels don't tolerate dirty air at all. I had an air filter element failure on a Cat 3406B and the rings were cut out of it in less than 1,000 miles of highway operation. It didn't help that the air filter can was located right behind a front wheel. It was a Donaldson element and to their credit, they paid a pro-rated amount of the cost of the engine overhaul, which amounted to about 1/3rd of the cost.
I've laid out the positive aspects of diesel power. I've owned diesels since 1971 and currently own three; the Kubota, a Dodge Ram and a VW.
Only you can decide if a diesel is right for you and it may not be, depending upon how many hours you'll use it in a year's time. There's an extra cost to buy a diesel and an hourly savings in running it. Divide the extra cost by the hourly savings per year and you'll see how many years it takes to break even.
That's cool, and assuming you got there doing what your screen name suggests, thank you for spending your career risking your life daily, dealing with the types of people I hope to never meet. Somebody has to do it and it's a good thing there are people like you who are willing to do it.
Horse power is not what gets work done, torque is. My 25k lb Army 5 ton only makes 275 hp (I believe), but I promise you it will drag any normal truck around with 5 times the hp.
I don't even know what Bahia grass is, but I'll bet the diesel cuts it better than a gas engine. It has more torque and that's what does the work.
But I need something that will cut tall thick grass...I have a 93 hp John Deere tractor I use for dragging big stuff..
Horse power is not what gets work done, torque is. My 25k lb Army 5 ton only makes 275 hp (I believe), but I promise you it will drag any normal truck around with 5 times the hp.
I have a Tiger Cat with the Kawasaki engine on it that has over 1600 hours on it and does not use oil.
But I need something that will cut tall thick grass...I have a 93 hp John Deere tractor I use for dragging big stuff..
A Tiger Cat with a Kawasaki gas engine would be either an FX691V or an FX730V depending on the deck size.
If torque is a better measure of ability to cut grass why are torque numbers not given?hp is just a measure of torque at a given rpm.
If torque is a better measure of ability to cut grass why are torque numbers not given?
The 22hp Kawasaki motors on the Tiger Cats are pretty impressive with power and durability. The secret again though to cutting the bahia grass is the velocity deck. We have had people stop where we were cutting grass and get out and kick the trimmings off the top and just look and say, " I didn't believe it would cut like that until I saw it."
One quick not on that. YOU HAVE TO KEEP SHARP BLADES ON THEM TO DO THAT.
Many days when cutting like that we have changed blades the third time in a 10 or 11 hour day to accomplish this.
It would take me 10 - 11 hours just to change the blades 3 times on my Cheetah..I try to change them every couple of years...
If torque is a better measure of ability to cut grass why are torque numbers not given?
I might not be smart enough to understand all of the technical terms associated with this thread. I do know one thing. I cut 90 plus properties in South Alabama over a two week period. 95% plus of those properties are Bahia Grass or partial Bahia Grass. In July and August when the afternoon rains start and the nights stay in the 80's it is almost like you can hear the mess growing.
I see debate on here an other places as to what will cut it and what will not cut it.
I run Tiger Cat Scags with 52" decks and Kawasaki engines.
I have on several different occasions run Turf Tigers with 35 hp Vanguards and 61" decks on them.
I once ran ZD 326 Kubota mower before going to Scags.
I have found NOTHING that will cut Bahia Grass with a 52" Tiger Cat Scag. The 61" Turf Tiger will cut it but not like the Tiger Cat. Over the course of several hours the Tiger Cat will cut more acres of grass than the Turf Tiger because of the fact that the Turf Tiger has to run slower or it will leave stringers that the Tiger Cats don't leave.
I have run them in the same properties, side by side. I have run the Turf Tiger and put my operators on the Tiger Cats. Then I have taken the Turf Tiger and put an employee on the Tiger Cats. Regardless of which of us runs it we see the same results.
I ran a Tiger Cat in the same yards as the ZD 326 Kubota with a 60" Deck. I never could get it to cut any where close to as clean as the Tiger Cat. I ran it myself and I had my operators try it and swapped back.
I still have a ZG 222 Kubota that is useless to cut Bahia grass because you have to make double passes over the Bahia to get it cut.
As much grass as I cut I need a bigger decked mower. I am going to look hard at a 72" or 61" Cheeta this coming year. I do not know what the outcome of that will be yet.
Everybody seems to have an opinion on what will Bahia grass and what won't. That is my observation.
I have on Tiger Cat that is above the 1600 hour mark. The deck has been worn through and patched several times. Abused is not a strong enough word for what that mower has been through. It has been assaulted or molested. That better describes how it has been used and it goes daily with little down time.
If you want to spend money. Buy something else. If you want to cut grass get a Tiger Cat Scag.
Interesting...What is it about the Tiger Cat you think makes it superior to the Turf Tiger?
I often wish I could bale my bahia....I use the Cheetah with the 61" cutter and the larger Kawasaki engine..My only complaint is that I don't like the twittchiness of the controls..It is just too fast to suit me..More experienced operators might like it...