It would be logical to think that the bigger the engine, the
more water (and fuel of course!) that it uses. Yes a VO engine
might only be 9607cc in capacity, but the added stress and most
importantly, heat, is where takes the water away.
Water is used to cool the engines. The hotter the engine, the
more water it would consume.
There are fuel consumption rates listed in engine specifications
but not water consumption, at least not a certain amount as it
mainly depends on the usage and temperature of the running
engine.
Think more of didn't top up enough water at the radiator,Bendy
buses use more water than rigids.Another reasons to deploy OC500LEs
faster than schedule or buy few WAB Bendies.
I would like to clarify that diesel engine isn't a steam engine,
it doesn't consume water at a steady pace. Just that, its more like
a tire. Over time, water will escape the cooling system in the form
of steam. As water escapes, the coolant (in this case, is water)
level drops. If the driver or mechanic or technician failed to top
up the water level, the engine will soon overheat and catches
fire.
An engine's cooling system consists of alot of pipings, like
your average housing's aircon piping system. Along this pipings
there are sealants/seals when theres a pipe connection. If any of
this seal is leaking or faulty, water can escape the system. Thats
why some buses always got a problem of "empty water tank" much
faster than other buses.
Another note to take of, when i say steam, its like water
vapour. Not those kind of boiling water when you boil water at
home. If the water in the cooling system boils at 100 degrees and
changes into steam rapidly, the cooling system will burst/explode.
Cooling system cannot withstand high pressures.
