Diesel Injector Pressure
Diesel Injector Pressure
(OP)
Hi,
I have an Italian WM 2.5 ltr diesel engine in my 1999 Jeep Cherokee.
http://www.vmmotori.it/
I want to up the injector pressure by 20 bar for better atomization of the fuel, but the new injectors I have bought have different pressure.
The #1 injector (which has a needle motion sensor in it and controles the timiing) has a pressure of 165 bar, and the other three have a pressure of 150 bar.
Two questions:
1. Is it normal to have the #1 injector have slighty higher pressure than the others.
2. If i do up the injector pressure by 20 bar, do i up all four injectors to 170 bar, or do i up #1 injector to 185 bar, and the others to 170 bar?
Any thouhgts help greatly apprecciated.
Thanks
I have an Italian WM 2.5 ltr diesel engine in my 1999 Jeep Cherokee.
http://www.vmmotori.it/
I want to up the injector pressure by 20 bar for better atomization of the fuel, but the new injectors I have bought have different pressure.
The #1 injector (which has a needle motion sensor in it and controles the timiing) has a pressure of 165 bar, and the other three have a pressure of 150 bar.
Two questions:
1. Is it normal to have the #1 injector have slighty higher pressure than the others.
2. If i do up the injector pressure by 20 bar, do i up all four injectors to 170 bar, or do i up #1 injector to 185 bar, and the others to 170 bar?
Any thouhgts help greatly apprecciated.
Thanks





RE: Diesel Injector Pressure
Upping the pressure won't help, most injection will actually be at greater than 600bar upto about 1200 bar, the injector pressure is just set for initial opening.
Simon
RE: Diesel Injector Pressure
Ken
RE: Diesel Injector Pressure
RE: Diesel Injector Pressure
All the injectors that where took out where 150 bar, so why the new number one injector i got was 165 bar i do not know.
I took it for a 20 mile test drive and all appears to be running fine, there is no loss of power or excessive smoke out the exhaust.
I think what happens is when you re-programme the MSA to expect a new injector, it detects the pop-off pressure of the new injector, and sets the timing and pressure on the injection pump accordingly, so there is no need to manually adjust the timing on the fuel pump.
Hopefully the fuel is atomizing better now and I will get better torque and better emissions.
RE: Diesel Injector Pressure
RE: Diesel Injector Pressure
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In the elctronically controlled injection pump, the pump plunger works the same as the pump plunger
in the mechanically controlled injection pump, but the amount of fuel, and the time the fuel is
injected is controlled by the vehicle's MSA, instead of by a mechanical govenor assembly.
A solenoid controlled by the MSA is used in place of Mechanical Govenor assembly, and it moves a
control sleeve inside the pump, and regulates the amount of fuel that is being injected.
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RE: Diesel Injector Pressure
RE: Diesel Injector Pressure