260 hp Merc Cooling system

[xcheesehd]

Has anyone used washers with smaller than 1/8" holes in them to get your water temp up a little for early season running? With stock sized washers can't seem to get above 120 degrees. Any ideas? Thanks Mark

[BUZZIN' DOZEN]

You don't regulate at the washers, it's the holes in the plate

[WillySteve]

You don't regulate at the washers, it's the holes in the plate

OR, the output hoses! When water can't get out as fast it's contained longer and gets warmer!

[BUZZIN' DOZEN]

The only reason for the washers is to purge air at the last point where the water is at the top of the motor, if you make the holes bigger your dumping water before it goes down through the head.
Why do you think Mercury adds water to the bottom 2 cyls. on a drag.
don't mess with the washers they have nothing to do with temp regulation.

[90 5.0]

The only reason for the washers is to purge air at the last point where the water is at the top of the motor, if you make the holes bigger your dumping water before it goes down through the head.
Why do you think Mercury adds water to the bottom 2 cyls. on a drag.
don't mess with the washers they have nothing to do with temp regulation.

if you restrict the washers more or the dump hose itself it will hold water in longer and build more heat it can only dump so much out the plate and bottom discharge. You will have to restrict this hose some too to make it work and watch psi to much restriction won't move enough water at high rpm, pressure will shoot through the roof and enough water isn't moving to cool motor at high rpm

[BUZZIN' DOZEN]

So mercury got it all wrong?

[patchesII]

I'd run it at 120 degrees.