3/4" Water Dump
 

I'm running a Bravo XR with sportsmaster lower, closed cooling on the engine, raw water exhausts.
Struggling with excessively high raw water pressure - it pegs the gauge.
Have put extra exhaust water dumps in (not shown in the below pic), which hasn't helped, even though it's dumping a good amount of water out of them and the exhausts.

So I'm thinking about putting one of the CPP integrated water dumps in.
Was originally going to put it in immediately after the raw water pump outlet, before the oil cooler, but can see from some threads that people have put them in after the oil cooler.
Where's the "best" place to put it - I'm not entirely sure where the restriction is - is it usually the oil cooler? the PS cooler? or the exhausts? Or the heat exchanger?
Thanks

https://mattyorke.com/wp-content/upl..._ios.jpg?w=800

Have you tried blocking off some of the water pickups on the drive?

Many folks have tapped the side or front holes and put set screws in them.

Maybe your drive is too deep and you are giving up speed too.

MadMat,

Just checking boxes....

Any possibility the gauge or the sender is faulty? You might be chasing a problem that doesn't actually exist.

Thanks. Brad.

It's a mechanical gauge. No evidence to suggest it's way off and they are super simple mechanically. Do they frequently over read? I'll have a hunt round to see if I have a spare.

What psi guage are you using ? 30 or so psi not uncommon.

yes, 30psi. Goes way past 30psi though, almost all the way round

so where are you reading this pressure from in the system? assuming the raw water side is going from the drive to the pump to the oil cooler to heat exchanger to manifolds and out? when are you seeing this pressure? what is it at idle, on plane cruising and at wide open throttle?

After the raw water pump, before the oil cooler. Idle is about 5psi, cruising is 30psi, WOT is off the end.

I'd take it at the block, on the engine somewhere or at least after the cooler.

You need to get your pressure reading from the engine block or intake manifold/tstat housing.

I believe you're reading the back pressure between the cooler and raw water pump, not what the actual engine is seeing.

says it is closed cooling so the block is not seeing this pressure, only the raw side and right after the pump. as pressure is only the resistance of the incoming water and the outgoing water you have too much blockage somewhere. I would see if you can take pressure at the exhaust manifold and if way lower then after the oil cooler, if still way high the heat exchanger is not flowing enough.