What is the purpose of the coolant hoses at the inlet manifold throttle body and the LPG converter? Heating or cooling?
The cooling system is already complicated enough. On the old Holden red engines we used to "do away" with the factory "heated inlet manifold" hoses and reduce the cooling system to a engine block, thermostat and a radiator. Part of the reason (I think) is because cold air has more power potential that warm air.
Interestingly, the RAVE suggests (see attachment) that the inlet manifold coolant connects are both cooling and ice prevention (heating) - so which one is it, and do we need either?
Same question for the slightly messy piping from the heater core pipes to my LPG converter. Is the water cooling the converter or heating it? Would it get too hot without the coolant (which is at 97 degrees)?
I think there is zero chance of ice forming on the inlet manifold in Brisbane. Why are we heating it? It just means more coolant hoses and connections to cause potential problems.
As the gas is moving from a high pressure (in the tank) to a low pressure (in the system) it will be cooling down. It can cool down enough to freeze what ever it touches including the air it comes into contact with.
In cold damp conditions your throttle body can ice up. Unlikely in your case. Changing the plumbing so that the water flows directly to the LPG converter is easy and removes one potential leakage point.
LPG in liquid under pressure. The heat required to boil it to vapour at atmospheric pressure comes from your coolant. The first sign of coolant loss on LPG is usually a converter covered in ice with LPG flooding the engine. Not a good idea!
There are gas systems that take vapour from the LPG tank and only reduce the pressure. They usually cope with using radiated engine heat only. They are commonly used for small engine industrial machines and diesel enhancement. Much too small to power a large vehicle engine like yours.
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