Winterizing a 165 Inline 6?

[JC_Weekender]

I have one question after winterized my engines? (Inline 6 165) How does the water transfer through the manifold and out to the stern drive? In other words how does water keep from getting into the exhaust ports?

Does it mix with the exhaust after the vertical elbow?

Thanks a bunch!

 

[macdaddy]

the exhaust pressure from your engines cylinders does push the water back , there are also some other factors, if you run a high performance camshaft you can have some overlap from your intake and exhaust valves that can actually suck water for an instant at the overlap point. Also a main factor is the static height of the elbow you mentioned in relationship to the water level outside the hull, you do not want to lower the engine/elbow too much or water can overcome your powerplant due to the fact that water will always level itself from outside to inside your boat. Keeping things at a higher level than the water outside is very important, such as overloading a boat with passengers in the rear and pushing the stern too low, it is quite a formula and calculation to determine static height. Hope I didnt muddy the waters too much.

 

[macdaddy]

The elbow allows the exhaust to flow down to the outdrive the water is contained in water jackets built into the elbow if you have gasket or o ring failure you can get water up against the exhaust ports or if your static height is too low water can work its way back up the exhaust just trying to level itself.