Join Date: Sep 2012
Location: Bremerton, Washington
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Re: Exhaust Manifold Flooding with Cooling Water
I did some reading about electric raw water pumps. The most practical setup I found was one in which the pump was controlled by an oil pressure actuator -- oil pressure comes up, pump goes on, oil pressure drops, pump goes off.
But I've pretty much abandoned the idea, at least as a way to reduce the likelihood of exhaust flooding. For one thing, it introduces lots of extra complexity (which is inversely proportional to reliability). For another, as has been recently pointed out in this thread, a mechanical pump is somewhat self-regulated -- at cranking speeds, it doesn't pump very much, and by the time it's running at normal pumping speed, the exhaust gases are clearing the exhaust. And lastly, a good pump is quite a bit more expensive than I had anticipated (not to mention the cost of controls, wiring, hoses, etc.).
At this point, my plan is to install the Speedseal Life (assuming it's made for my engine), which will allow the pump to better tolerate a few seconds with shutoff suction (so I can open the seacock after the engine starts, rather than before).