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Just exactly what is the function of one? I have a jackplate, is it necessary to have one?

When you have a jackplate is the best time to have one. Tells you the water pressure moving the motor, so you don't overheat.

Eerman wrote:When you have a jackplate is the best time to have one. Tells you the water pressure moving the motor, so you don't overheat.

exactly...

If the motor is peeing even raised to the max, isn't getting water to cool it?

may be getting water to pee but may not have enough presure to cool the engine properly. water presure gauge will tell you.

Are water pressure gauges still accurate after installing a rock gaurd??

Yes. However TinCan did have an issue where his rock guard was creating turbalance and preventing water from going into the intakes. Particularly with his JP raised.

I noticed my water coming out was not "solid" looking, but sort of broken up. When I got home and hooked up the hose to flush the stream was "solid" looking. I am wondering if this is a pressure issue, or if there was something clogging the water tube that the higher pressure from the water hose cleared out. I'll know next trip to the water.

I have a rock guard also.

birddog wrote:Yes. However TinCan did have an issue where his rock guard was creating turbalance and preventing water from going into the intakes. Particularly with his JP raised.

What was the cure?

He took the RG off.

I've noticed no ill-effect from the RG on my 115. With the JP 6" high I have just shy of 20 lbs. water pressure. I credit that to the tunnel hull.

I think the tunnels design feeds enough water for the raising of the motor with proper function. That's why water pressure is still sufficient. No need for a low water pickup.

I wonder why in TC's case he had to remove the Rg? What was different on his setup?

Redbelly wrote:
I wonder why in TC's case he had to remove the Rg? What was different on his setup?

Thats a whole nuther can 'o worms. I'll let him answer that.

Redbelly wrote: I wonder why in TC's case he had to remove the Rg? What was different on his setup?

My boat was factory rigged without a jack plate. The factory setup was with the motor 2" above the transom. When the jack plate was installed, the transom was not re drilled, and the jack plate was bolted in the same holes the motor was. The jack plate adds 2" of motor height. What that means is my motor is raised 4" with the jack plate all the way down. It runs fine there, with no blowout. However, as high as the water pickups are on the lower unit housing, the rock guard caused enough turbulance for the pressure to drop in the turns, or if I raised the motor any higher. I'd rather be careful and take my chances with the rocks than guarantee a burned up motor because of lack of cooling.

So am I right in assuming yours is not a tunnel hull?