Floor is out!!!

[Mike Harry]

I agree, that temp seems a bit high to me. Also blockage in the exhaust Mantis will do the same thing (rust)

[56mulberry]

Manifolds are very clean and the impeller/pump is NOT leaking anywhere at all--I run just a few degrees over 160 when under way (maybe 162-163? and if sitting idling it will creep up to about 172-174ish  but never over that--replaced all cooling hoses with new and checked routing against manual so I think they are OK.

Is the 165-175 range dangerous?  It does not seem very hot for a V8 but I am used to cars not boats...

The ambient water temp here is near 90 right now....

[Mike Harry]

Dangerous?  I don't know. What I do know is stock t-stat temp is 140 and I was told by Ron a 160 stat is good for performance.

[Joel]

I dont believe its a problem, just keep an eye on it if she starts rising.  The 143 F t-stat keeps mine really cool and if she can pull Dan Tanis up barefoot on a long-line then she's got more than enough power for me...  not that Dan is overweight or anything...  LOL!!!     The Reunion pic of Dan barefootin' are behind my boat.  He can also kneeboard with the best of 'em - the man has talent 

Joel

[RonT]

Trouble begins around 190-200 deg. usually meaning that one side of the exhaust is getting more water than the other, the dry side could be seeing 300-400+ deg. exh. temp which the rubber hoses & glass pipes won't like. Did you check the inlet side of the trans oil cooler for debris??  Remember the water is really doing 2 things in our ski boats, first it is absorbing heat generated from the engine (engine by itself is happy around 190-200deg.) the other is to keep the exhaust system (mufflers, hoses) below 200deg. If you have 140-150deg water exiting the block into the exhaust manifolds it is mixed with "bypass" water (whatever your lake temp is) and will absorb another 10-30deg. of heat from the exhaust gas. 

[56mulberry]

Yes, trans cooler clean--plus I replaced ALL hoses on the boat with the exception of the 2" one on front right of engine which I assume is the recirculating/internal water pump hose.  I have clear hoses on top of manifolds (the 3/4") so can see them working well.  We ran it a couple hours Sat pm and it stayed around 162-165 when under way and about 170-172 when idling for more than a few minutes but never over that......it is always between 160 and low 170's......Other than replacing the other large hose I am not sure what else could be replaced.

My exhaust is about 12" reinforced 3" rubber from the manifolds to some stainless 45 degree bends then rubber for about 10" to the old 3" fiberglass straight pipes.  It stays very cool when running at the hose and the fiberglass pipes to the touch at this point. 

I have no leaks anywhere--all is tight in the impeller pump also it seems.....

will keep looking. thanks DOUG

PS--Ron- still waiting on side hull stickers to be finished.....   let you know as soon as they are done....

[Joel]

Sounds like its running fine and mid - 70s temp is great.   Mine probably runs cooler because of the 143 F thermostat      Cant wait to see it up close & personal at the 2nd Annual