2.2 EGR Valve Coolant Control

[Beery]

Has anyone got an EGR valve for a 2.2 lying around?
I'm wondering if someone can confirm either way whether the coolant flow through the EGR valve is continuous or controlled by an internal valve.
https://www.aulro.com/afvb/images/imported/2017/12/513.jpg
Cheers
Tom

[Zeros]

Further to Beery's question...is it possible to blank / close the EGR on a Puma 2.2 without getting a remap and without dash light coming on?

[Beery]

To answer your question, Zeros. No, the ECU is too clever for that apparently. It has to be remapped to not call for egr.

[martnH]

To answer your question, Zeros. No, the ECU is too clever for that apparently. It has to be remapped to not call for egr.Are you thinking of complete egr delete? Including removing the hardware? And remove the cooling piping as well?


I have a remap and was told better to leave the hardware functional as if ever the engine temp is too high, egr can be used as a method to lower engine temperature

Cheers

[Beery]

Are you thinking of complete egr delete? Including removing the hardware? And remove the cooling piping as well?


I have a remap and was told better to leave the hardware functional as if ever the engine temp is too high, egr can be used as a method to lower engine temperature

Cheers
I'd like to remove it, but thats not really why I'm asking. I'm wondering if there's a constant flow of coolant because if so, a significant amount of coolant would be bypassing the radiator, like is already happening with the heater valve.
I'm looking at it as a possible way to increase engine cooling capacity in hot weather by putting a single heater valve in the hot supply hose.

I've heard it before but I don't for the life of me see how EGR can can help cool a diesel down. That would best be done by limiting engine power, which it already does at high temps.

[roverrescue]

EGR definitely cools the combustion process by taking up the space of combustible air with general ****
His reduces EGTs which would reduce engine heat loads

The benefit though in my opinion is not worth the cost of pouring carbon and **** into your engine

From my reading of the WSM and considering that the cooler is straight through no valve I would guess that it is simply an open circuit

Steve

[Beery]

From my reading of the WSM and considering that the cooler is straight through no valve I would guess that it is simply an open circuit

Steve

I wonder then why coolant would pass through the EGR valve before going to the cooler.
Maybe there's a water jacket in the valve to stop it from overheating.

[martnH]

I'd like to remove it, but thats not really why I'm asking. I'm wondering if there's a constant flow of coolant because if so, a significant amount of coolant would be bypassing the radiator, like is already happening with the heater valve.
I'm looking at it as a possible way to increase engine cooling capacity in hot weather by putting a single heater valve in the hot supply hose.

I've heard it before but I don't for the life of me see how EGR can can help cool a diesel down. That would best be done by limiting engine power, which it already does at high temps.The egr let exhaust gas into the inlet manifold and this displace certain amount of oxygen in the chamber (I.e. choking the engine

And this will lower the cylinder temperature because less air less bang...

[martnH]

I wonder then why coolant would pass through the EGR valve before going to the cooler.
Maybe there's a water jacket in the valve to stop it from overheating.I may be wrong
But I think the cooling in the egr is actually for the recirculated exhaust gas

So I think the coolant will be constantly running there but if the valve is closed, there is no high temperature exhaust gas to be cooled to won't have any effect?

Cheers

[Beery]

Im trying to work out why the coolant flows through the egr valve before the egr cooler.
Not worried about heat load from exhaust gas (egr is disabled) but the constant flow of hot coolant bypassing the radiator.

[Toxic_Avenger]

So what's your end goal? Additional cooling using the EGR cooler, OR adding an additional heat exchanger, or something completely different?

FYI the 2.2 has a blanked off bung in the back of the water pump. IIRC it's the suction side of the pump.
If you EGR is disabled, then you'd have the supply, and a available return port to allow additional cooling, as long as you work out the modulation of this heat exchanger.
I've thought of using the blank return port for some kind of on board water heater. But it's a job that is on the back burner.

[Beery]

So what's your end goal? Additional cooling using the EGR cooler, OR adding an additional heat exchanger, or something completely different?

The end goal is blocking the flow of coolant so that it all has to flow through the radiator when the thermostat is wide open.

[Toxic_Avenger]

I trust you've already consulted the FSM, particularly the flow diagram.
https://www.aulro.com/afvb/images/imported/2018/01/462.jpg (https://imgur.com/TjyBtMB)
(#16 is the fuel cooler, FYI- this info was on another page of the manual).

I'm no expert, so will throw some questions out there as food for though / primers.

Not sure how a lack of coolant would affect the EGR valve and EGR cooler, if at all. But begs the question, if your EGR system is not operational, then does it matter if it were to not have coolant flow? Also 'what role does coolant have in the lifespan / failure mode of these parts?'.
So we have 2 extremes- a part that might be around EGT's (500C?), OR at coolant temp - circa 90 degrees C. It's a big difference.

Considering a failure, best case - nothing happens- with EGR disabled, a static exposure to exhaust gas at the cooler and EGR valve just heat the part up with no damage. EGR cooler and EGR valve would approach EGT's.
Worse case, the EGR cooler matrix disintegrates as a result of excess heat, fails, and dumps water into the exhaust or worse, into the intake manifold if the EGR opens.

If it were me, and I were really chasing the gains, I'd remove the whole lot - coolant lines, EGR cooler and EGR valve. Something doesn't sit right with a part like that exposed to hot exhaust without a method to cool it down- especially so given what a failure might cause (total engine destruction).

If you were to put a heater tap in the circuit upstream of the EGR valve and cooler (items 4 and 3), could there be issues with the pump having additional suction on the return side (keeping in mind the heater matrix is not always supplied with hot coolant)? Not sure if this would lead to cavitation of the pump- which you'd want to avoid where possible....

If you really want extra cooling some extra options might be:
1) plumb in an additional radiator (think like a heater core size unit- under car with electric fan, or up front somewhere)
2) Turn your heater on in the cab- as much as it sucks, it's essentially 'emergency cooling reserve'.

[Beery]

I want to simplify things and free up space under the bonnet so some pieces of hardware may be going. There definately wont be any auxiliary radiators going in.

I simply want to make sure all of the coolant is flowing through the radiator at wide open thermostat.