Full RPM or high idle? Bush hogging fuel efficiency

[jejeosborne]

i simply don't think you may have ever mowed in weeds 8' tall?? on an open station trike? with some rain? debris do! land on you simply from driving forward. with no front axle on a trike, ( trike.. remember.. narrow front!! ) the front of the running board is the first contact point for nearly 60% of the stuff hitting the front facing of the tractor.. those tall seedy, weeds then slap ME as they hit the running board and curl over.

I sometimes think you purposefully try to distort what you read / vs what i typed?

i don't think it's possibly to mow for a day in those conditions, and then come out clean and smelling like a rose.. unless you can also walk on water.. raise dead people and started a religion a couple thou years ago.

if the latter is true.. .. my appologies.. don't smite me

I grew up in central Illinois on a real farm with some of the most fertile soil in the country. Drove a few trike John Deere tractors with a hand clutch, old 4020's, and articulating steigers. I will say I haven't mowed 8' weeds in the rain but cut them in the dry days and ended up looking like a mud monster from the sweat and dust combination running full throttle. My only point of this whole discussion, which you continue to avoid, is that sometimes it is not necessary to run at high rpms while using a rotary cutter when the vegetation that is light. Reducing throttle will increase the life of your equipment if nothing else because of the lower vibration and less rpms on the engine.

 

[jejeosborne]

oh.. don't be interjecting any logic into this now.. that'll just get you branded a stupid dirty moron like jejeosborne implies i am..

I never implied you were a stupid moron so you too must have a reading comprehension issues. Seems like you enjoy ramping issues up to the next level but I don't play those games. In fact I agree with everything you have said. I just added a simple statement that was to be interpreted as not always needing to use a tool to its fullest potential every time and you didn't like it. Sorry it made you feel like a stupid dirty moron.

 

[Soundguy]

I never implied you were a stupid moron .

http://www.tractorbynet.com/forums/...22-full-rpm-high-idle-bush-5.html#post2980849

post 42.. when I said, after mowing in those harsh conditions and said I'd be dirty.. you asked why.. then made a comment about your brain helping you out. That sounds to me like you were implying my brain was not helping me out by some how magically dodging debris i had NO WAY to dodge whilst mowing in those rough conditions.

as to wear? another poster summed it up well. no need for me to revisit that.. nor to post my opinion again.

I'm not inot babying a tool. i don't choke up on hammers, nor run mowers at low rpm.. I've found higher the blade tip speed.. the better the suction and cut. thus 'I' mow that way. again.. as said.. I don't give a oot what anyone else does to their equipment.

 

[DarkBlack]

Power generated by the engine is always equal to power required to perform the task. Fuel consumption is proportional to power required multiplied by time. Mowing at lower rpm will not save fuel because it takes longer to perform the task. The tractor wear will be also about the same. The pistons in the cylinders travel at lower speed but for longer time. This assumes constant efficiency of the engine regardless of rpm though. The specific fuel consumption curve suggests that the highest efficiency is reached at about maximum torque (PTO speed) so mowing at lower speed might in fact use more fuel. Noise and stress on the mechanical components of the tractor is another issue.
Case study are cars with modern auto transmissions. They are hard to beat in fuel consumption by identical car but with manual transmission because of automatic keeps the rpm in around the region of the best fuel consumption. Manual transmission has theoretically lower losses but most drivers don't keep the rpm at the best fuel consumption (in fact it is impossible unless the trany has many gears).

You have got to be kidding: You don't have a clue what you are wrtiting about. What a bunch of sheet!
I think every sentence you wrote is absolutely incorrect starting with your first.
Go duct tape your car to stay in first gear forever, as the punishment for your unqualified preposterous 'science'.:thumbdown:

 

[Soundguy]

You have got to be kidding: You don't have a clue what you are wrtiting about. What a bunch of sheet!
I think every sentence you wrote is absolutely incorrect starting with your first.
Go duct tape your car to stay in first gear forever, as the punishment for your unqualified preposterous 'science'.:thumbdown:

actually...fuel consumption should be related to load. I've side to side cmpaired my 70hp tractor with 10' mower and 95 hp tractor with 15' mower mowing 10ac.

what I found was that it took 5g diesel to mow 10 ac.. whether it was done in 2 hrs on a 15'mower or 3 hrs with a 10' mower.

that's a pretty easy to figure ratio, and fuel per load issue..

in the end.. it takes 5g of diesel to mow my 10ac, given roughly equal vegitation condition.. and exact same terraine.

 

[DarkBlack]

fuel consumption should be related to load. I've tested my 70hp tractor with 10' mower and 95 hp tractor with 15' mower mowing 10ac.

what I found was that it took 5g diesel to mow 10 ac.. whether it was done in 2 hrs on a 15'mower or 3 hrs with a 10' mower.

that's a pretty easyu to figure ratio, and fuel per load issue..

You guys are starting to wear me down.. sigh...
Fuel consumtion is related to heat produced by the engine, not by pto load. I'll give you the first clue..
The heat can be maintained as heat and wasted away by the cooling system. Another possibility as it can be transformed into a gas presuure in a cylinder...

 

[DarkBlack]

Do you doubters even know that ICE's are "heat" engines?

 

[Soundguy]

did you read my post or just automatically tell me i was wrong on something I posted exact numbers I've observd mowing.

I said it takes 5g diesel to mow my 10ac pasture.

it doesn't matter if my tractor is doing it in 3hrs with a 10' mower.. or 2 hrs with a 15' mower.

did you read that.

are you telling me i'm a liar?

so far.. it appears that you are ????

 

[DarkBlack]

This thread is about doing the same job at high or low engin rpm.
You won't confuse me by changing the subject to seem like we are talking about differnt mower sizes and types. maybe that confuses you?

 

[Soundguy]

This thread is about doing the same job at high or low engin rpm.
You won't confuse me by changing the subject to seem like we are talking about differnt mower sizes and types. maybe that confuses you?

AH-HA.. I asked you a straight out question and you are deflecting it..

I know my tractor is going to use more fuel per hour running at 2100rpm under mowing conditions.. vs no load. thus load DOES factor in on fuel usage.

now.. man up and answer my question.

you called me a liar right? or you didn't read my post? ( or didn't understand it? )

it's one of the 3.

don't deflect. be a man. and answer... liar? didn't read?, didn't understand?

which one?

this isn't about anything else. I made a post.. you said i was wrong on what I observed mowing my pasture with my equipment.. this is what i'm asking about.