Water flow direction?

[CNT]

Hey guys,

can anyone tell me which direction the water flows on a 2.4 200h.p. Merc. . Out from the heads, threw the thermastates and down to the bottom of the block where it tees off and runs to the side of the motor cowling and pisses out or , from the bottom of the block and up to the thermastates and into the heads? I made a liquid cooled rectifier and need to find the best way to route water to it without creating a pressure drop in the cooling system. Anyone have a suggestion on where I can splice into it? Cooloing system is stock and I was thinking about running the water that pissess out the side of the motor threw the liquid cooled rectifier then out but that water is allready hot when it comes out.

[WATERWINGS]

the first place the water gets to is the plug at the top of the block, (behind the flywheel)

Most people put their waterpressure guage there, but some also have a hose that runs to the poppet valve there.

I wonder if you could run a "T" there and use that water, (at its coolest), don't know what that would do as far as showing a difference in water pressure though.

You might also be able to run another speed-0 pickup and have that water running to the rectifier, and dumping after that. ????

[Burke Kilgour]

The passage just aft of the poppet (some motors have an elbow on the poppet cover there) leads directly into the chest as well. Some race motors aren't machined right through at that location, but yours should be. Watch how much water you dump, as you don't want to have low water pressure just to cool a rectifier.
The 2nd speedo pickup idea sounds good too.......very creative ;)

[mendo]

Hey Burke!!!!

How is your cooling mod thing working out???

Haven't heard from you in a while.

[Bassin'69]

Go to www.biggerhammer.net and go to "2.4 cooling diagrams. Here is link:
http://www.biggerhammer.net/mercury/waterflow_89newer_2.4_2.5_blizzard.jpg
Hope this helps.

[CNT]

That is a good idea wih the speedo pickup but it doesn't supply any water unless your running. That can be a problem if you come off of a long run and the rectifier is hot and then the water stops running threw it. Almost all of the rectifiers that I'v replaced blew when the boater was just idaling around and the motor could'nt get enough cool air into the cowling at idaling speed to keep the heatsink body of the rectifier from getting to hot. The old style used to mount into the back of the exhaust and get cooled by the water flowing threw exhaust plate. I may try teeing off of the water pressure line but I'm still afraid it may create to mush pressure drop. It would be ideal if I could put it inline somehow so that it would get cool water and then dump back into the motor so that I wouldn't loose water pressure in the system.

[Burke Kilgour]

Mendo, the cooling mod is working just perfectly :D
I still have a few hours of break-in left, but the temps and pressure have been right on the mark.
CNT, I'd have to check, but I think that elbow behind the poppet dumps water on some models anyway so pressure drop wouldn't be a problem, now that I think about it..........

[CNT]

How about inline between thermastates? there is already a rubber hose that runs between the two thermastates. I could just cut it and run one end in and the other end out back to the other thermastate. The water may still be two hot there thow.

[Burke Kilgour]

I'd suspect it'd be a bit too hot there depending on the max operating temperature of your rectifier. You're going to have 140 degree (or so) water running through that hose.

[captcarb]

Check this thread (http://forums.screamandfly.com/forums/showthread.php?s=&threadid=55037&highlight=cooling+diagram) for a diagram.

Jim