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Water oulet diameter

J

JerryIke

Member
Would changing the water outlet size to a larger diameter be allowing the water to exit "too fast"? Hence less efficient cooling and overheating at WOT? Because that's what I did and that's the results. New water pump and thermostat installed also.
 
No such thing as water going " too fast " to not cool a motor.-------------Have you looked at thermostat and poppit valves / grommets at the top of the cylinder head ?
 
Unclear on the water outlet size are you talking about the telltale indicator fitting? I doubt it would cause a overheat unless there is a restriction at the bottom of the powerhead. Get a gallon of salt-away and put the lower unint in a barrel of water up at least 5 inches above the cavitation plate and idle the engine with the saltaway in the barrel for at least 1/2 and hour. That should clean all the cooling circuits just keep a eye on the head temp by putting your hand on the head and count slow to six. It should get hot enough you want to pull your hand away but dont have to. If you cant hold your hand there you need to figure out why.
 
If you made the tell tale hole bigger it will make no difference on the cooling.----------And most of the cooling water goes out the prop !
 
Actually, the tell tale is taken off before the water goes through the powerhead. So, in theory I guess if you bleed off a large amount of water, that is water that is not going through the powerhead to cool it. I guess it sort of depends on how much you are bleeding off and whether or not the cooling is marginal to begin with. Why did you modify it? Was it marginal?
 
Put dual pee tubes on my last project, cuz I thought it looked cool. Works just fine. Providing ya got a strong water pump? Once that pee hole water's been through the block it really don't matter where it goes.

www.youtube.com/watch?v=yi6g8lf1kOQ
 
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If you say so. We weren't given a specific year of model number, but as a general rule, the telltale is taken off the exhaust cover. Water flow is first to the exhaust cover, then around cylinders, then though the thermostat and relief valve, then cylinder head and on out. The fact that the telltale is up front explains why cool water comes out. OK, so I gave a generic answer. But check it out.
 
fdrgator said:
If you say so. We weren't given a specific year of model number, but as a general rule, the telltale is taken off the exhaust cover. Water flow is first to the exhaust cover, then around cylinders, then though the thermostat and relief valve, then cylinder head and on out. The fact that the telltale is up front explains why cool water comes out. OK, so I gave a generic answer. But check it out.
Click to expand...

Yep.... That's how it goes.

Apparently the engine model number is a secret? :)
 
Eh, rather than hide. I think it's best owning up to makin an ass backward statement. Cuz then ya can have 'closure', and 'move on' ...
 
I had a 2001 Johnson 90hp. For whatever reason the teltail plug was not put back in on a shake down run, before long it over heated and went into SLOW mode. saw that water was coming out like a weak garden hose. Putted back to dock and put pisser plug back in. No overheat!
 
Dunno bout the new stuff, but on older motors the pee tube exited the bottom of the exhaust cover. And I think you were posed to plumb it so it went up'n over the highest cylinder. Then back down to exit the pan?
 
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