Gotta be liquid cooled, Anthony, or we are still in the dark ages.
Its not just the thermal shock imposed on tug engines specifically that
favours jacketed engines, the internal tolerances can be sharpened
considerably due to the limited temperature changes, improving power,
emissions, wear and overall reliablilty. Noise output also goes down,
cleaning is simpler although there is an argument for reliabililty due
to coolant system failure (more bits, basically)
I am not currently up to speed, however a few years back (8-10) both
Cummins and GM / Detroit heavy motors stated their #1 engine failure
cause was coolant system fault. Current engine managments systems can
get you home / safe with a full coolant system loss, albeit at a
significantly reduced power output.
I do like the 3000 hour bit though....
Wayne Carter
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