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9th September 2010, 22:20 | #1 |
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Rover 75 Connoisseur SE Tourer Auto Join Date: Feb 2010
Location: Wakefield
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Diesel thermostat definative answer
Regarding my enquiries with the UK technical manager into whether BMW ever used a hotter thermostat in the M47R engine, this is the reply I have received. This comes from the BMW development engineers in Germany.
The M47R, as we called the engine, was different to the engine for the 320D. For the Rover ( 75) and Land Rover ( Freelander) application we used the first common rail injection system. I went back into my documentation and have spoken to the "older" colleagues in the development about the "cold" running engine. We have never used different Thermostat during the life span of the entire M47 engine ( D and R), so we do not have different thermostats to choose from. We have introduced different thermostats for the late M57 D. Anyway, we are sure, you cannot change the behavior of the engine with a different thermostat. At the time when we introduced the direct injection diesel engine we had problems to get the engine to proper working temperature, because it was so efficient. We remember that we had big problems to get enough heat for the passenger compartment heating, therefore we had additional heating. Basically it would not help to get a different thermostat, because the engine will not deliver more heat and therefore the operation temperature of the thermostat does not matter. I assume the cars are mostly driven in cities and will not get too much load on the engines. There is no other way to get the engine to hotter temperatures as to put load on them ( faster driving or uphill driving !). Sorry for this disappointing news , but if they want to play with thermostats, then I would recommend that they will take one out of the car and go to a spare part depot and have a look if they can find another one from a different car, which will fit. At that time, the supplier used mostly the same design for different car manufacturer. BMW Group UK So thats it boys back to the drawing board |
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