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Farm Machinery
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High horse power four cylinders can’t sustainably do the same job as a larger six pot of similar HP. Tell me I’m wrong
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<blockquote data-quote="Cowabunga" data-source="post: 7477997" data-attributes="member: 718"><p>That is indeed a major issue for many farmers. An MF 6470, even with the optional right hand mounted auxiliary tank, has nothing like the tank capacity of a 6480 six pot, which both makes it appear to some people that it drinks more [it doesn't] but that damned mid afternoon refill is just unacceptable on a hard working tractor that is working away from a refill tank. One of the criteria I've always used when choosing a prime mover is that it should be able to work for, ideally, ten hours flat out full power, but an absolute minimum of eight hours.</p><p></p><p>I work that out on the back of a fag packet [not literally]. So a 180hp tractor is 135kW. At approx 200gms/kW/h * 135 = 27 litres per hour on an average counting no-load work. Ten times that is a minimum of a 270 litre tank. 60 gallons. That's the absolute minimum I would even consider for an intensively used tractor of that size. Ideally it would have a 300 litre tank.</p><p></p><p>140hp = 105kW so 105*200=21000gms/hour. That's near enough 21 litres*10 hours= a 210 litre which is a 46 gallon tank. A 50 gallon tank would do nicely, that's irrespective of whether the tractor has four or six cylinders. It's more likely to have that size tank if six cylinder. As it happens the new MF 5S145 has a 200 litre tank, which makes a refreshing change for the better for a four cylinder tractor. It works out even better for lesser horsepower 5S models because they retain the same tank capacity.</p><p>Just checked and the 180hp MF7718S has a 305 litre tank, which is again acceptable by my calculation. Just about acceptable even if it was the 7719S model.</p><p></p><p>MF must use the same sort of calculation as I do when speccing their tank sizes these days. They didn't used to, because the old 6400 four cylinder tanks were inadequate once you got to higher than 100hp in my opinion. Even with the optional tank it was inadequate for the 5470 and 6470.</p><p>Similar issues occur with most other brands.</p><p></p><p>Not everyone needs to work flat out all day or work away from home of course, but it is increasingly likely to be a more regular occurrence these days with bigger farmers and contractors.</p></blockquote><p></p>
[QUOTE="Cowabunga, post: 7477997, member: 718"] That is indeed a major issue for many farmers. An MF 6470, even with the optional right hand mounted auxiliary tank, has nothing like the tank capacity of a 6480 six pot, which both makes it appear to some people that it drinks more [it doesn't] but that damned mid afternoon refill is just unacceptable on a hard working tractor that is working away from a refill tank. One of the criteria I've always used when choosing a prime mover is that it should be able to work for, ideally, ten hours flat out full power, but an absolute minimum of eight hours. I work that out on the back of a fag packet [not literally]. So a 180hp tractor is 135kW. At approx 200gms/kW/h * 135 = 27 litres per hour on an average counting no-load work. Ten times that is a minimum of a 270 litre tank. 60 gallons. That's the absolute minimum I would even consider for an intensively used tractor of that size. Ideally it would have a 300 litre tank. 140hp = 105kW so 105*200=21000gms/hour. That's near enough 21 litres*10 hours= a 210 litre which is a 46 gallon tank. A 50 gallon tank would do nicely, that's irrespective of whether the tractor has four or six cylinders. It's more likely to have that size tank if six cylinder. As it happens the new MF 5S145 has a 200 litre tank, which makes a refreshing change for the better for a four cylinder tractor. It works out even better for lesser horsepower 5S models because they retain the same tank capacity. Just checked and the 180hp MF7718S has a 305 litre tank, which is again acceptable by my calculation. Just about acceptable even if it was the 7719S model. MF must use the same sort of calculation as I do when speccing their tank sizes these days. They didn't used to, because the old 6400 four cylinder tanks were inadequate once you got to higher than 100hp in my opinion. Even with the optional tank it was inadequate for the 5470 and 6470. Similar issues occur with most other brands. Not everyone needs to work flat out all day or work away from home of course, but it is increasingly likely to be a more regular occurrence these days with bigger farmers and contractors. [/QUOTE]
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High horse power four cylinders can’t sustainably do the same job as a larger six pot of similar HP. Tell me I’m wrong
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