2 litre Bongo

[dave_aber]

Oh well, that' sthat idea out of the window!

Apart from the (possibly) lower running temp, I can't see why the 2.0 would be any more resillient to a cooling problem than the TD.

What's this self-bleeding people are speaking of - is it true? Doesn't help with a major pipe burst though......

[lpgimports]

Just down to the lack of complexity of the 2.0 over the 2.5TD and V6 2.0 small 4 pot petrol no turbo so fairly basic.

[g8dhe]

Petrols don't run as hot as diesels so you might get away with a small overheat in a 2.0 if a pipe burst, 2.5TD almost certainly you have issues.

Has this ever been proved correct?

Can it be true?

Petrols are LESS efficient than diesels and so produce MORE waste heat that has to be got rid of somehow and that is usually by means of the cooling system.

I suspect a lot of the confusion is about what is being "wasted" - you can only waste energy, you cannot waste temperature.
After that the question that can be asked is, at what temperature is the energy being wasted ?
If you take the same amount of waste energy and remove it slowly from a device then the temperature of the device will increase, in order to "store" that energy until it can be removed. If you remove the waste energy rapidly then the temperature will be less.

A diesel engine has to operate at a higher cylinder temperature simply because the fuel will not burn unless it is at a higher temperature than a petrol engine. Now I have no useful knowledge on engine design, but the increased temperature can only be achieved either by burning more fuel to create more energy or to restrict the removal of energy from the cylinder in order to increase the temperature. As I say I don't know how engine design is carried out, but from what we see with the Bongo, it seems like the balance between removing the heat and maintaining the temperature is critical in the design of engines used in the Bongo, any significant reduction in coolant flow and the temperature increase causes the head to destroy itself!