heater warm up ?
Assume that the only issue was to get heat into the truck cab as soon as possible ! Would you start truck and get up to up to hiway RPMs and speed quick or would you maybe travel slower in a lower gea...
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ShinerBock wrote:ScottG wrote:
(Sorry, off topic) The thing I don't understand is how new gas engines warm up so fast.
The 6.4L in our other Dodge starts blowing nice warm air within 30 seconds of starting no matter how cold it is outside. Almost makes me think there's a electric coil in there.
Two words... thermal efficiency.
Due to the high compression ratios/expansion ratio of a diesel, most of the heat(energy) made during the combustion process is used as work and does not need to be carried away in the coolant. Gasoline engines are less efficient at utilizing the heat(energy) as work from the combustion process and more heat gets soaked into the engine which gets carried away in the coolant. Therefore a lower compression ratio gasoline engine will get the coolant to a higher temp much faster due to how inefficient it is at utilizing the energy from the combustion process versus a diesel.
Sorry for the "engine nerd" answer.
Gasoline engines run rich when there cold therefore producing heat faster and run hotter to be emissions compliant. They're designed to do this and not a function how efficient they're at utilizing heat.
During college summer breaks I worked for Texas Department of Public Transportation Maintenance and the guy I worked with would always have me put his lunch wrapped in foil on the diesel engine intake manifold when I would check the oil in the morning so his food would stay warm for lunch. That engine would run all day and barely get warm but was very fuel efficient. This was a non turbo diesel engine.
