Adding a Calorifier / Hot water cylinder

[MarkJohnson12345]

Re: All indirect cooled engines

The engine is freshwater cooled.

The seawater is pumped mechanically through the heat exchanger, then back overboard with the exhaust.

The freshwater around the engine is pumped by the electric pump arond the engine block, up to the Martek heat exchanger and around the calorifier.

As you say why does the engine overheat when the water in not pumped aeound the engine? I guess that 'normal' circulation of this freshwater is inadequate.

With a directly cooled engine, the volume of seawater being pumped around the block must be quite large. Thus expecting an indirectly cooled engine to cool itself by natual convection of the freshwater is a bit much.

Thus the indirect system almost certainly needs to be pumped. The weak link is the electical pump. Maybe the pump should be mechanical, thus while the engine turns, its being cooled.

How do other indirect systems do their pumping???

 

[cliff]

Re: All indirect cooled engines

[ QUOTE ]
How do other indirect systems do their pumping???

[/ QUOTE ]Beta use a mechanical circulation pump as do most all other makes I can think off. The only ones that may use an electrical pump are conversions from raw water to indirect cooling such as the conversion you describe.
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[charles_reed]

sounds as tho\'

your layout is ill-conceived, probably carried out by a previous owner.

All basic systems, such as engine cooling, should fail safe.

The additional thermostat, in the calorifier h eating coil, is only put there to speed up the warming of the engine coolant in the indirect system.

It's probably only necessary where you have a massive hot-water tank and large calorifier. Most of our boats, with a minuscule <25 litre tank don't need the added complication.