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Generation 4-1 Pajero NS Model 2006 - 2009

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Old 14-07-18
Johnnytheone Johnnytheone is online now
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Default Turbo charger confusion.

Perhaps someone can clarify a few things for me re turbos, or rather the use of cleaning agents in them.
My understanding is that exhaust gas spins a turbine, which drives a compressor that drags outside air in through the air cleaner. This compressed, (and subsequently hot) air passes through the intercooler and from there is used in the combustion process.

I watched someone on YouTube using an aerosol "Turbocharger Cleaner" (Wynns product I think). This stuff was being sprayed into the compressor. Given that the turbine and compressor are not directly connected it seems to me that any cleaning agent must have to go through the entire combustion process before it gets to the item it's meant to clean. I can imagine it may help clean the intercooler or even the inlet manifold, but the vanes of the turbine?? Other than a bit of dust or maybe moisture on it, does the compressor side get significantly dirty? I'm assuming all components are in ok condition

Anyone able to shed some light on this, or is my understanding of the turbo system flawed.

Thanks, John
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Old 14-07-18
erad erad is offline
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The air system with a turbo driven engine is thus:
1 Air Cleaner
2 Turbo (compressor - clean air side)
3 Intercooler
4 Intake manifold
5 Engine
6 Exhaust gasses drive the turbo (turbine - hot, dirty gasses)
7 Exhaust - Catalytic converter and maybe a DPF as well

In between stage 1 and 2, you get oil fumes from the sump being recycled by being introduced to the incoming airflow and burnt rather than dumping to the atmosphere. These fumes can gunk up the blades of the compressor and reduce its efficiency. How much, I don't know, but I suspect that it is not that great.

The case you are highlighting involves removing the air hose between the air cleaner and the turbo, so the only part not being cleaned is the air cleaner to turbo. Mind you, this is where the air flow meter is often installed, but it should not get that dirty anyway. The intercooler can get gunked up with oil (the crankcase fumes, although initially hot will be cooled by the intercooler and some oil may condense back from gaseous state back to liquid.

At the intake manifold, the manufacturers install some EGR (Exhaust Gas Recirculation) systems for pollution reasons. This brings hot gasses from the exhaust back into the intake manifold, and they mix with the incoming crankcase fumes to form a solid crud which ultimately blocks up the intake manifold. There is a lot of discussion on this and other forums about ways to minimise this problem. Interfering with this system is illegal, but many people do it anyway.
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Old 15-07-18
Johnnytheone Johnnytheone is online now
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Default Turbo charger confusion

Thanks for the reply Erad. Your view is that the cleaners purpose is intended to clean the compressor internals rather than the actual turbine?
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Old 15-07-18
erad erad is offline
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I have no idea as to what the cleaner is intended to do, but squirting it into the turbo intake will probably clean the compressor blades, but certainly do nothing for the turbine blades. I doubt that it would do much beyond the compressor blades. Certainly I cannot see the intercooler being magically cleaned, and probably not the intake manifold either. And even if you do manage to de-gunk the intake manifold, where does the gunk go? As you can probably guess, I am not really in favour of this type of internal engine cleaning.
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