Because I want to set up a closed loop cooling system for the block I have purchased a heat exchanger setup from a Mercrusier 350 engine. What I am trying to determine is if I need to rig up a crank mounted raw water pump to push the lake or salt water through the exchanger and out the mainfolds/exhaust.
I've just seen some info and videos that the pressure form the line that comes from the jet can get pretty high (to the point were people run reducing valves) so I've started to think that I may not need this additional pump.
Assuming that there might be cooling issues during extended periods of idling with low water flow from the jet, are their any thoughts as to if an addition pump might be need based on how much water is delivered from the jet?
Sort Version - is the water delivered from the jet during normal operation (mid rpm) equivalent to a garden hose... more / less?
Kent is not likely you will want or require the small crank mounted Johnson style pump particularly in light of your newly aquired converted Jacuzzi drive , the drive should deliver all the pressure and volume you need , we would rig it to where raw water passes thru the sand filter and thru the heat exchanger and then exits via the rizers
This was a similar setup we repowered a while back
Thanks for the info and the photo (nice setup by the way). This is great news and I think I will see about going this route for my heat exchanger setup. I'll do some more investigation about possibly putting a pressure reducer inline before the exchanger but not buying a mounted crank mounted raw water pump and formed hoses certainly helps my diverter budget!