Posts: 3472
Location: Elk River, Minnesota | Hiya,
Honestly, I would not know. If there is a stream coming out, you have pressure of some sort....the only real way to tell is through a water pressure gauge to know really what is going on. I know my former 1999 Johnson 50hp was like a faucet coming out by design, by my recently sold 90 hp it was a small stream. Not extremely strong, but there nonetheless. With a pressure gauge, the 90 was pushing around 20 psi at full throttle, and below 10 at idle.
For those interested, a pressure gauge is not too hard of an install. It usually comes with all of the fittings for the install, but you would have to locate the outlet hole on the engine to install the fitting....install with a little thread tape, drill the correct hole in the instrument panel/location of choice, and you are good to go. It's not a necessary item unless you are running a hydraulic jackplate where you could easily drop your water pressure, but it is an extra gauge to monitor how the engine is doing.
When you think about it, it doesn't take a huge amount of pressure to move water around through the engine. Water is a pretty easy fluid to move with very little effort. That is why so many people out there have not replaced their impellers with any sort of regularity because if it's exiting the motor, all seems to be good. But...then again, many boats out there don't see the kind of use that harder-core fishermen can put their rigs through.
Steve
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