The Difference Between Warm Vs Cold Marine Exhaust 42 Off Buy parts and products. warm versus cold marine exhaust manifolds refers to the temperature of the cooling water that is introduced into the exhaust manifolds on a marine cooling system. this specific system feature can apply to raw water (also known as open cooling) systems as well as fresh water (also known as closed cooling) systems. Typical cold manifold flow diagram . in a warm manifold system the warm water coming out of the engine and through the thermostat is the only coolant that actually passes through the exhaust manifolds before passing through the manifold riser gasket joint and mixing with the cold bypass water that is being introduced into the riser. the fact.
The Difference Between Warm Vs Cold Marine Exhaust 42 Off The cold water passes thru the exhaust manifolds first before elbows. (typical exhaust is ~ 1500 degrees ) so the walls of the manifold get hot and that water must take that heat with it as it passes by. with the 4 hose design cold water goes to the elbows almost all the time directly so the port vs starboard heat issue is less evident. Warm vs cold manifolds: what is the difference between “warm manifold and cold manifold” exhaust cooling systems? water distribution housing options: can you explain what the purpose is for mercruiser’s water distribution housing most of the marine engines are being equipped with today? water pump impeller failures. 4″ = 4.5″ od. 6″ = 6 5 8″ od. “wet” size is always the actual id of the exhaust hose. tube is always the actual od of the tube (pipe) and is usually about 1 8″ wall meaning a 5″ wet tube or frp (fiberglass) exhaust tube or pipe has approx a 4 ¾” id. exhaust hose (any hose for that matter) is always sized as an id measurement. The gaskets between the manifold and elbow (or riser if risers are being used) are closed, keeping the coolant in the manifold and separate for the sea water in the elbow. the only exception is a ½ closed cooling system, where the heads and block have coolant and the exhaust manifolds have sea water, in which case you would want open gaskets.
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