I'm attaching the screenshot of the map of the rail of the T7070 and T7.270
In particular, in the first, the pressure has a trend at the met? the diagram I have the pressures pi? with low iq that increases going to the right..
Then the pressure according to me are very low, I looked at the parts catalog, and both tractors mountain the same injectors and the same pump to the rail.
What do you think?
Rail pressure T7070 vs T7.270.jpg
The series t7 does not have the recirculation of the exhaust gases within as a instead of c'? the 7000 series..
we talk about the percentage of recirculation in the order of 20%.. I think this affects the amount? diesel iniettaro..
the series t7 returns have typical efficiencies of motors without recycling.. would be interesting to see some technical iveco if ? possible to mount the camshaft of the t7 on the t7000.. maybe faith knows something?
thanks!
Yes, I have said that one has changed the shaft to the cams... The problem more? what else ? that to mount it you have to disassemble and****to turn the engine. Exactly, I don't know but it must be why? if you do not****turn the engine then drop to the auction?Originally Written by MultiBravo
If not I would have already? done that myself! And I do not share even the choice of Iveco to integrate the EGR in this way
With regard to the development of pressures? not ? that eventually changes the diesel injected, where in the t7070 I pressures pi? low avr? however, injection times greater equality? of fuel to be injected.
And if you increase the pressure without changing the quantity? diesel fuel is injected into the avr? just the time of injection pi? short but I don't know if the map ? cos? because of the egr..
The Cio? to say if I look at the curve of 130 mg/cyc I have these pressures in these rpm
700 rpm --- 950 bar
800 rpm --- 950 bar
900 rpm --- 950 bar
1000 rpm --- 950 bar
1100 rpm --- 933 bar
1200 rpm --- 923 bar
1300 rpm --- 921 bar
1400 rpm --- 899 bar
1500 rpm --- 857 bar
1600 rpm --- 978 bar
1700 rpm --- 1082 bar
1800 rpm --- 1161 bar
1900 rpm --- 1212 bar
2000 rpm --- 1233 bar
2100 rpm --- 1203 bar
2200 rpm --- 1141 bar
The maximum torque the engine has at 1500 rpm (when the pressure ? pi? low) and the maximum power seems to me to be right at 2000 rpm (where I have the maximum pressure)... ? a case or c'? some reason?
Yes, I confirm that ? a lot of work to change a camshaft on these engines.
for? the benefit would be significant according to my point of view..
Faith, you know for certain that the operation transmission shaft on the t7000 with the new t7 ? come to a good end?
That cost has the tree?
With regard to the injection pressure vs. engine speed at a fixed flow rate of fuel, I read the how to adjust the duration of the injection..
This? since 1500g/m, we have the pressure pi? low we will have the duration of injection pi? high; 2000g/m where we have the pressure pi? high we will have the duration of injection pi? low..
Then you can? also read how to atomization of the jet: 700g/m, we have the atomized jet pi? finely that to 1500g/m..
I would like to see cos?, if c'? someone more? experienced well-being, we have always something to learn..
She informed me on the price, from what I know the operation ? been done with success on a Case Puma.
For the speech pressures back a few posts you said that having the egr then iniettavano diesel less having less efficiency of the engine, at least cos? I have understood.
For? if it were so? the diesel fuel would be limited in the map lim diesel as a function of engine speed. Instead, in the T7070 (tier 3 EGR), and T7.270 (tier 4A with urea and without EGR) quantity? maximum diesel we at 1500 rpm.
T7 has higher values, but ? also true that has more? pair and pi? power.
But I do not understand the fact of the pressures pi? low.
As you can see each evolution of the common rail system you have improvements, but we also have pressures pi? high. Many say that the pressure is not important... but, I think that benefits.
Perhaps I misread the table.. when you say the map of 130mg/cycle, means to inject 130 mg each burst right?
So I started with this parameter fixed, and I deduced, since the pressure ? note, that the variable ? the duration of the injection..
I made those arguments on the timing of the injections..
Back to my reasoning, or have I missed some step?
about nef with egr vs no egr the difference between a diesel engine and the other as ? as a percentage?
Thanksss!
Is the reasoning ? correct, what I say that even if in the nef with the egr had put the same map of the rail of the one without the egr and not changing the quantity? diesel fuel is injected we will have the engine with the egr injects the same quantity? from the original, but if we have more pressure to make? in a shorter time.
So ok that may inject less fuel, but if the same fuel inject the less time that problem?
With respect to the shaft cams have told me that is 5/600 euro and in any case the difference is felt especially at low but since the madness to mount it and forget it.
To see the differences of diesel I should check with the T7.250 perhaps that should have the same power T7070, there guarder?!
Higher pressure means better atomization and more time of injection pu? to improve the mixing of the charge to burn the cio? it mixes better with the fuel with the air?
Thanks for the info cams..
last question about the hard work done on the Case Puma: the customer is good, has done a lot of work? do you know if ? the state made an adjustment on the mapping?
The fact of the tree I don't know... I was told by a friend who in turn had discussed on a forum of this and I don't know if then had been made in the mapping.
Clearly ? an intervention that benefits and definitely can? more help if the tractor is mapped.
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