Keel cooling schematics help

[yodani]

This is not a sturdy keel cooler but a toy. With only 3/8 width the material can only be flimsy and easily damaged.
There is not much difference in calculations for aluminum and copper in thin walled objects, this cooler is way too small for you.

But the good new is that the seller ships to the US only, so forget about it.

It's what I have thought CDK. He ships to Romania for 120 USD so no problem there but I'll pass.

I think I will build one from 20mm copper tubing and see how it goes. Will be probably cheaper too.

By my calculations I will need about 15m of pipe for the ideal surface.

Cheers,

Daniel

 

[FAST FRED]

Our 50 Ft US Navy utility boat is powered with a 235Hp Detroit Diesel 6-71.

The keel cooling consists of 2 - 21 ft lengths of 1 1/2 inch galvanized pipe that are curved to the hull contour.

The coolant goes down turns 90deg with an elbow , a short nipple and turns 90deg again and goes back to the engine.

Low cost , no hassles , and plenty of cooling , even here in FL. Simple works.

 

[rick gray]

keel cooling

Do you mean to say this is an engine with a dry sump, where the crankcase oil is pumped back into a tank?
And why does it have 2 heat exchangers?

Basically the keel cooling just replaces the heat exchanger. A single thermostat keeps the cooling circuit closed until operating temperature is reached; a narrow bypass allows the coolant to circulate through the engine.

i need to hijack this site and your reply. i want to keel cool my project amphibian.i need advice on cooling a 350 chev engine,with aluminium water cooled exhaust manifolds(small eldelbrocks) i intend to run 3' s/steel tubes(one only or two) about 8 ft long down lower chine outside hull (faired in) or cofferdamed into aluminium hull at lower chine, and add a small aluminium radiator with fan, and small vented expansion tank, and recirculate with 12 volt pump. the engine water will be separate,with radiator,possibly a heat exchanger raw water supply on demand, or recirculated,when out of water? the trans and transfer case will be cooled by radiator like in a car. any design guide would sure help ,before i get ahead of myself.