Water Pressure Differential?
 

Also, what is correct water pressure with bravo pump? I hear everything from 10 to 50 psi.

Water pressure will vary from boat to boat depending on water pick up, depth of drive and speed. 1-2 psi at idle up to 30psi at WOT is pretty normal.
The water psi at either location should be about the same.

Gotcha, I never see over 10 psi with the mechanical pickup in the T-stat housing yet, my engine temps never approach 150* either and risers luke warm at idle.

Keith

Maybe I can put this on my list of things to move and see if there is a difference between block and T-stat. Don't know if I'll get around to it, will be easy enough to move for a test at the T-stat, will see

Post a pic of where you're tube is installed. I don't think you are getting the engine water pressure reading. It sounds like your reading might be coming from the water that is bypassed to the exhaust. 10 psi is low for WOT on any engine at WOT. Also, your water temp is low. It should have 160* T stats and run 160-170* on the guage. I wonder if somebody installed 140* Tstats.

Griff,

Here's the location, left side of the termostat housing, has the blue tape on the tube. Seems pre-circulation pump, post raw water pump. Engine is only raw water cooled.

https://photos.shutterfly.com/full/13995233979

I just cleaned my water pressure hoses this week. I am picking up of some pretty large intake ports in a bmax drive. Similar to an imco and only saw around 7 psi this weekend. That's with hoses feeding off the 1/4" ports near the freeze plugs in the side of the block. Should there be concern

Can't view pic without signing into the account

Looking toward the stern of my boat at the front of the engine, mine is installed in the left side of the T Stat Housing in the port behind the temp sensor.

It would be the left bottom pipe plug as you look at this pic Stainless Steel Thermostat Housing - CP Performance