16th September 2020, 19:56
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#10
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This is my second home
Rover 75 cdt club + Rover 2.5 KV6 Conni SE
Join Date: May 2008
Location: Birmingham
Posts: 11,387
Thanks: 6,587
Thanked 2,262 Times in 1,729 Posts
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Quote:
Originally Posted by kelvo
My understanding has been that diesel engines inherently run cold because they are more efficient and hence generate less 'waste' heat which is why they always take that much longer to warm up, particularly in cold weather.
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You are correct in your assumption that diesels ‘run’ cooler than petrols because they are more thermally efficient than petrol engines, but that does not mean they ‘have’ to run colder than petrol engines. Because diesels take time to get ‘hot’, they can have a later opening thermostat. This will allow the engine to run more thermally efficient, which means more MPG. It also cuts down on ‘shellacking’ of internal components. I can reveal a secret that I have kept for many years now. My transport manager at work wondered why my lorry used to do more mpg than any other same make lorry, over a similar type of terrain. I put a higher opening thermostat in without anyone knowing about it apart from one other driver.I did it with every lorry I drove Volvo, Mercedes, Daff.
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Great Barr, Birmingham.
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