Pro Max Mid section swap question

[Mrzip]

Merc 2.5... From the time i get in it .. Tux974. I use a Land & Sea. I have no idea of the water Temp. Several lbs @ idle. Double digits on top. I have NEVER had a Hot engine. NEVER

[Merc 2.5]

Well lucky u. I have heard all kinds crap people tryin use em
Steel bore motors?

[Mrzip]

How am i Lucky ?

[tlwjkw]

How am i Lucky ?

'cause most everyone else has ta make changes to tha coolin' stuff ta get temps and pressure where it operates tha "steel sleeve" motor right...………..

[tux974]

Merc 2.5... From the time i get in it .. Tux974. I use a Land & Sea. I have no idea of the water Temp. Several lbs @ idle. Double digits on top. I have NEVER had a Hot engine. NEVER

Water temp in a steel sleeve motor is important. Not about running hot which is also important to keep an eye on but to have the block build proper heat. Having the motor run nice and warm will probably help in longevity.
The L&S plate is a bit different but I would still be very concerned about obtaining proper heat.
3 most important basic gauges to me....Temp, Water pressure and Tach.

[TEXAS20225]

X2!!!!! amen Tony thats the gospel concerning 2.5 steel sleeve motas !!!!! as a person who has rebuilt 100s of steel sleeve motas and not just a well one time i had A and thats that statement, my best luck with a one piece plate was using a bridgeport one piece on my promax as bolts were 7/16 not 1/2 it seemed to work ok after water was being controlled on how much it was restricted by closing off pisser hoses with brass fuel hose barbs (reducing is diam.) but the off shore mid caused me to go into find a prop mode the can exchange would not allow me to run the thru hub props i did before just my .02

[tux974]

Bobby, yes I have found the BP plate works well because the 4 small holes which allows the water to exit nicely thru out the plate, I like that.
As for the 7/16 bolts. I end up tapping them to 1/2" because I usually run the newer single ram saddle that has the fat HP arm which are 1/2" holes, more work....
Yes, the water tweaking takes a bit of work to obtain the proper running temp especially in the water temp one runs.
Here (north) if you really want to be on top of things the tweaking is a couple of times a year. Spring water is colder, fall the water is warmer. The good thing once you do it you get to know you swaps/mods....
Also agree the heavier, wider housing changes the dynamic back there....