Exhaust Manifold circulation setup

[John Smith]

I have an Old 72 omc 307 elctr.shift Outdrive boat with a old log style exhaust manifold and an elbow(I just order an center type manifold with a riser, when I described the old cooling system to Tech. who sold me the manif. he said I have a partial close system, because the salt water from impeller goes thru heat exchange, then enter the elbow to the exh. Manif. then out the out drive). Is anyone could show me how to route a complete close system. Tech said it is much better with antifreeze circulating the engine as well as the rest of exh. Manif. What is the advantage and diasadvantage of close and partial close cooling system. <br />You help or input is greatly appreicated

 

[akriverrat]

Re: Exhaust Manifold circulation setup

engine warms up faster and manifold lasts pretty much forever.