PEUGEOT BOXER 1.9Ltr Diesel Engine Page 15


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1.  Peugeot Turbo Charged Diesel Engine  Description.

Peugeot Turbo Charged Diesel Engine

An engine at some point of it's function is not able to suck enough air into the engine to give efficient running. Often this point can be experienced as a fall off of power. This discrepancy can be overcome by pumping air into the engine input. This is where the Turbo Charger comes in.

The Turbo Charger is attached to the exhaust manifold. The vanes of the turbo charger are spun by the force of the exhaust pressure from the diesel engine. This energy drags in air from the Air filter. Then pressurised air is sent to the intercooler to cool the air down. Cold air is more efficient than hot air.

The pressurised air from the intercooler is then forced into the engine input.  

I have read that this turbo function can increase the efficiency of an engine by more than 30%.

The Diesel engine on my Wanderer has a Turbo charger fitted. For those who don't have one, I can highly recommend it as a modification.  Once fitted it is automatic in service.

There appears no way to know if the turbo is faulty, this can be a bit disconcerting. On asking a Peugeot mechanic if it was possible to check the turbo, he pressed the flexible pipe to the intercooler and revved the engine. He said with his experience the swelling of the pipe in his fingers indicated a turbo which was functioning.

I have produced these notes to give the non mechanic some idea on how the turbo works.

It is extremely important that the air filter is changed with the oil, as it feeds directly into the turbo. Any dust particles could damage the delicate parts of the turbo pump. The oil must also be changed regularly to ensure the oil which is pumped from the engine, to the turbo, is not contaminated. 

See the 'Practical Motorhome' magazine, Jan. 2004 for an impressive article, with pictures, by Eddie Evans, with a complete explanation and modification to the Peugeot Boxer engine.

This work was carried out by, [Who are now out of business]:
Turbo House, Port Royal Avenue (off Willow Lane),
Lancaster, LA1 5QP, England
Tel:: 01524 67157/39840.
Fax: +44 (0)1524 61167

The cost can be in the region of £2100. This is not a DIY modification.

Information below was obtained and is acknowledged to this site:

In order to handle speeds of up to 150,000 rpm, the turbine shaft has to be supported very carefully. Most bearings would explode at speeds like this, so most turbochargers use a fluid bearing. This type of bearing supports the shaft on a thin layer of oil that is constantly pumped around the shaft. This serves two purposes: It cools the shaft and some of the other turbocharger parts, and it allows the shaft to spin without much friction.
This oil comes from the engine so oil changes are very important and should be carried out at the allocated times. Synthetics and semi-synthetics are recommended for turbos because of the high temperatures generated by the turbo shaft.
Some turbochargers use ball bearings instead of fluid bearings to support the turbine shaft. But these are not your normal ball bearings, they are super-precise bearings made of advanced materials to handle the speeds and temperatures of the turbocharger. They allow the turbine shaft to spin with less friction than the fluid bearings used in most turbochargers. They also allow a slightly smaller, lighter shaft to be used. This helps the turbocharger accelerate more quickly, further reducing turbo lag.

A description by the professionals can be seen at:

Below are some images I produced to illustrate how the Turbo Charger in the Wanderer functions.

A sketch on the Wanderer Turbo function

A sketch on the Wanderer Turbo function.

Pipe from turbo to intercooler.

Pipe from turbo to intercooler.

The turbo is located at the rear of the engine, and clamped to the exhaust outlet.

Turbo pipes to and from the Intercooler

A larger image of the tubo pipes above the engine

A larger image of the turbo pipes above the engine

Output from the turbo

Output from the turbo to Intercooler.
This image is taken under the engine and to the rear

Another view of the pipe from the turbo fitted to the near side of the engine

Another view of the pipe from the turbo fitted to the near side of the engine

Exhaust pipe clamped to the turbo output

Exhaust pipe clamped to the turbo output.
This image is taken under the engine and to the rear

Turbo pipe to intercooler

Turbo pipe to intercooler with flexible connector.

Here is the oil feed pipe to the turbo from the engine

Here is the oil feed pipe to the turbo from the engine.
This image is taken under the engine and to the rear

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