Full RPM or high idle? Bush hogging fuel efficiency

[aczlan]

Wrong again.
I think the redneck in training, and sounguy log-on posters are the same guy. posting the same made up science. Am I right?

No you're not; different people.

Wrong DarkBlack... They are different people.

All right redneck. Let's start with this one, because this is flawed on many levels. Let's start with your math. Please show us your math where you arrive at 8X power needed to double the speed...

Let me google that for you

I don't much care for the "ridiculous" comment either, but Farmwithjunk is not known for his tact or gentle treatment of other members, know from personal experience, but he provided what I thought was pretty good information based on his experience; whether it's relevant in our case is up to us, like everything else we can take it or leave it.

I agree that his data and advice is sound, as for the rest, the facts are the facts and everyone in the inter net should be taken with a grain of salt to account for different writing styles.

IMO, every tractor/mower combination is different and running at 1000RPMs vs 2500RPMs will probably not change the 2000+ hour expected lifespan of the motor in most CUTs by more than 20 hours unless you lug it and break something. It also probably wont change the fuel usage by more than $30/year.
If you are that interested in it, look up the fuel use and torque vs rpm curves and find the sweet spot, then try running at that RPM see how the cut looks.

As for me and our tractors, we run at the RPMs needed for a PTO RPM of 540 when using a PTO implement (except for the tedder which only needs ~300 RPMs at the PTO).


Aaron Z

 

[TripleR]

I listen to you... LOL

It would be nice if we could just post our thoughts for others to accept or not, as they please... And leave the thoughts of others alone. We may not agree, but that's what makes the world go 'round!

I've yet to meet the person that has the ultimate grasp of "all the answers..."

I know it sounds naive to some and trust me I have not led a sheltered life, but I just don't know why some people find it so hard to be civil and not denigrate others. Now I'm not knocking those who respond in kind and I'm certainly not trying to tell others how to behave, it just seems senseless to me and counterproductive. Good information is often discounted due to poor presentation.

 

[284 International]

Good information is often discounted due to poor presentation.

This is VERY true. I think there have been some very useful posts here, with solid information. Some gets discounted because of the person posting it, or the tone of the message. I think sometimes poor information crowds out good information because it is repeated more loudly and vehemently, while sometimes good information is discarded because it doesn't fit preconceived notions of truth, conventional wisdom, or other factors.

 

[von-mil]

Be nice to people - It's better for your health. You'll live longer.

 

[DarkBlack]

Please show us your math where you arrive at 8X power needed to double the speed...


Let me google that for you




Aaron Z

Nope. not talking about drag cars at 200mph Original situation was from 30-60 mph. It's not 8X.
stick a fork in me I'm done.
I agreed to let this debate die. Let it die.

 

[Farmwithjunk]

What gives you the right to call the honest replies of other posters ridiculous???

Pretty high and mighty... I guess not much changes!

Well, we can start with the fact that much of this thread IS ridiculous hypothetical nonsense. Then we can toss in the fact that much of it is just a bunch of armchair engineers rehashing theories that have little basis in reality.....

I can continue if you like....

 

[Farmwithjunk]

Concur...while I do appreciate Farmwithjunk's input, I query his "example" of a 140hp tractor with a 20' batwing mower. HOW MANY of the members here use and have such an extreme example of a mowing tractor? What a RIDICULOUS reply...how is a 140 hp tractor's fuel usage applicable to the owners/members here who use a machine with 20-30 PTO hp?

"Approximately 2-1/2' tall...." sorry, that is not precise enough....to give real input the grass and weeds have to be EXACTLY 2 1/2' tall in each and every usage situation. Otherwise your example is simply RIDICULOUS as the height of the grass and weeds have to be the same for comparision purposes.

Not trying to bash you but I really do think you have no valid reason to say others here have "ridiculous" replies.

So you aren't interested in real world facts? Based on the majority of this thread, I see you aren't alone.

 

[Farmwithjunk]

He may provide information relative to his experience, but shouldn't we treat others in the manner we would like to be treated ourselves? Others here are not idiots, and don't deserve to be treated as such.

Deal with others on the internet the way you would in a face to face conversation...

I do....Say something ridiculous "face to face" and I'll say the same exact thing. Much of this thread is comedy at best, conjecture and baseless theory at most...... Apparently I struck a nerve. If you feel like an idiot, that's your choice. Never said you were, but I won't argue with your personal assessment.....

 

[Farmwithjunk]

To whom it may concern; Go back and read my FIRST post. Then show me where I directed any comments towards any one person or persons. It was directed at several VERY comical theories and hypothetical concepts. If anyone takes my comments personally, so be it. I'm not one to sugar coat things. There are post's in this thread that sound like a 3rd grader typed them. There is some very legitimate and useful opinion. Depending on which group you feel like you belong to, you can react accordingly. And if your tender feelings don't allow you to be questioned, maybe you should join a sewing circle with a bunch of old ladies.

 

[JDgreen227]

So you aren't interested in real world facts? Based on the majority of this thread, I see you aren't alone.

Real world facts are those I observed as they occurred and were properly recorded...suppose I claim my Deere gives me an overall fuel consumption rate of .45 gallons per hour over a 100 hour operating period. How many of the members here are going to tell me I am full of it? The problem I have with this entire thread is that in the real world, there are simply too many variables involved to calculate accurate fuel usage. Did you mow with your tractor at the same outdoor temperature every time? Was the vegetation you were cutting always the same height and moisture content and density? Was the humidity the same every time you mowed? Did you always use the same fuel from the same supplier? Is your tractor tachometer accurate and was it calibrated every time you used the tractor? Did you always refuel it in the same place at the same time?

Sorry guys, just too (censored) many variables involved in the issue for me to believe what anyone claims.