I have been asking around this question for a long time now, but I still don't have a good answer for it.
Why does it take longer for a diesel engine to warm up an interior of a car in comparison to a gasoline engine?
Diesels don’t run as warm as gasoline engines and many drivers still remember how long it took the interiors of 1970s and 80s Mercedes and Volkswagen diesels to warm to a comfortable level. That's why the 2011 Golf TDI that I have have heated seats. And boy do they work.
Cast iron block and beefier components = more mass to warm up.
Less waste heat = less heat transferred to engine coolant (engine coolant warms the cabin).
Diesel engines have an higher thermal efficiency that petrol so more heat from the fuel burnt does work and isn't absorbed into the cooling system. This is mainly due to the higher compression ratio of a diesel. A petrol engine has a thermal efficiency of 25% a diesel has a thermal efficiency of 35% thats why you get more miles per gallon. Thats why for every $1 of fuel you put in a petrol you get 25 cents of power out of it and 35 cents of power from a diesel.
VW know that diesels take longer to warm up thats why they fit an auxilary heater in the heater system thats burns diesel in its own chamber to warm the inside of the car in colder countries.
What you mean by take more RPM's? You talking about idle or cruise speed?
Either one i'm going to have to bust that theory. Unless you mean that a gas engine requires more fuel to burn to mantain a set rpm then a diesel? Diesel fuel dose burn cooler.
The speed of fuel combustion is also a limiting factor. There is a window to inject the fuel and burn cleanly.
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