actual use of tier 4

[MessickFarmEqu]

I'm sorry your just not right. Your looking at this from the perspective of engines of years gone by that's simply not true any more. No one said more RPM does not equal more fuel... of course it does. What I said is that its not linear. It uses a smidgen more fuel to get the pistons going faster, but without the added torque load there is no need for full fuel. This is a smart electronically injected engine now, not a dumb mechanical fuel pump.

It is also certainly more efficient than engines from Tier 2 and Tier 3 where things where du-tuned to meet emissions. The good thing about tier 4 is that with after-treatment there is much more latitude on how the engine is tuned so power and fuel use can be optimized.

 

[MessickFarmEqu]

I'm sorry your just not right. Your looking at this from the perspective of engines of years gone by that's simply not true any more. No one said more RPM does not equal more fuel... of course it does. What I said is that its not linear. It uses a smidgen more fuel to get the pistons going faster, but without the added torque load there is no need for full fuel. This is a smart electronically injected engine now, not a dumb mechanical fuel pump.

It is also certainly more efficient than engines from Tier 2 and Tier 3 where things where du-tuned to meet emissions. The good thing about tier 4 is that with after-treatment there is much more latitude on how the engine is tuned so power and fuel use can be optimized.

 

[kenmac]

Well, everything that I have read / seen,, engines that have to go into re generation use more fuel.... All the new diesel trucks get less fuel mileage than the older ones ,because of the regen process.. Regen, requires more fuel to be burned in order to clean the DPF..This extra fuel is wasted, because it's only being used for 1 thing.. to clean the DPF.. How is that efficient ?

 

[Luke'sScreenName]

I think part of the problem might be the conflation of efficiency, economy, and consumption. :confused3: :drink:

 

[Topesrule]

if I understand correctly, my tractor uses fuel when it is doing a regen to heat the exhaust, so it is less efficient during the regen. the thing is it only regens for about 20 minutes every 20 some odd hours. if it's a more fuel efficient engine for those other 20 hours then I would think that's more than making up for the 20 minutes of the regen. The engine seems extremely fuel efficient in my experience.

 

[kenmac]

if I understand correctly, my tractor uses fuel when it is doing a regen to heat the exhaust, so it is less efficient during the regen. the thing is it only regens for about 20 minutes every 20 some odd hours. if it's a more fuel efficient engine for those other 20 hours then I would think that's more than making up for the 20 minutes of the regen. The engine seems extremely fuel efficient in my experience.

Don't know if it's true with tractors or not...But,That hasn't been the case with vehicles.. When the manufactures starting installing DPF's on the new diesel trucks,, fuel Mileage went down

 

[Popb1949]

Most complaints on the B series Kubota tractors with tier 4 DPF have been in the extreme north where they do snow removal. They run at low RPMs to operate snow blowers.
Down south they have very little problems with Kubota B series tier 4 tractors
They don't run the tractors at high RPMs and it is already cold. So the tractor does not get hot enough to Regen completely and most B series Kubota owners are not true tractor people the know very little about Tier 4 tractors.
Residential use is different from commercial use where they work hard!
They must generate heat to do a complete Regen ,
Low RPMs and extrem cold is the problem!

 

[MessickFarmEqu]

if I understand correctly, my tractor uses fuel when it is doing a regen to heat the exhaust, so it is less efficient during the regen. the thing is it only regens for about 20 minutes every 20 some odd hours. if it's a more fuel efficient engine for those other 20 hours then I would think that's more than making up for the 20 minutes of the regen. The engine seems extremely fuel efficient in my experience.

My understanding is that the amount of fuel burned in a regen is a tiny fraction of the tractors fuel use, a rounding error in the end.

Any correlations between the on-road truck industries experience with Tier 4 and what we've seen with tractors is really an apples to oranges comparisons. As has been covered many times, the workload and usage patters between truck and tractor engines are completely different and technologies matured quite a bit before making it to us.

 

[MessickFarmEqu]

if I understand correctly, my tractor uses fuel when it is doing a regen to heat the exhaust, so it is less efficient during the regen. the thing is it only regens for about 20 minutes every 20 some odd hours. if it's a more fuel efficient engine for those other 20 hours then I would think that's more than making up for the 20 minutes of the regen. The engine seems extremely fuel efficient in my experience.

My understanding is that the amount of fuel burned in a regen is a tiny fraction of the tractors fuel use, a rounding error in the end.

Any correlations between the on-road truck industries experience with Tier 4 and what we've seen with tractors is really an apples to oranges comparisons. As has been covered many times, the workload and usage patters between truck and tractor engines are completely different and technologies matured quite a bit before making it to us.

 

[forestcreature1]

Just a field update: 2014 deere 3046r/cab 70 hours no issues, 1 regen [auto] only noticed that since it was foggy out and you could see the exhaust plume.