Raw water cooling

[danielwrich]

I have an inboard ski boat that I'm setting up with a 1uz running a soft clutch setup and will be running in fresh water, I want to run a raw cooling system that picks the water up from pickups in the hull and runs it through the block.
My question is should I remove the water pump turbine and leave pulley, or run it as well as a external pump to supply water pressure to the block

 

[Zuffen]

Given the role of the waterpump in the cam drive I'd be inclined to leave it stock, in other words I'd be afraid to modify it in case it failed.

I know the valves are safe but still a royal pain if it fails.

 

[danielwrich]

Given the role of the waterpump in the cam drive I'd be inclined to leave it stock, in other words I'd be afraid to modify it in case it failed.

I know the valves are safe but still a royal pain if it fails.

Ah okay I see I think I'm going to run a belt driven pump to supply water to the block and see wjat factory pump does