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Old     (AndersonMC)      Join Date: Mar 2010       06-28-2011, 9:54 AM Reply   
What range should my temp be in?
Old     (tonyv420)      Join Date: Jul 2007       06-28-2011, 10:01 AM Reply   
165 -175
Old     (razzman)      Join Date: Dec 2006       06-28-2011, 10:15 AM Reply   
Depends on the engine. The mercruiser on my last boat averaged around 170 which is ormal. My Indmar 325 averages around 180 which is normal for them.
Old     (migs)      Join Date: Aug 2006 Location: SF Bay Area       06-28-2011, 10:33 AM Reply   
172-175 on my merc black scorp
162-164 on my PCM excal
Old     (bill_airjunky)      Join Date: Apr 2002       06-28-2011, 3:10 PM Reply   
Depends on the thermostat thats installed in it. Seems like 160s come from the factory a lot. Heatercraft usually bumps that up to a 170 or 180 if their heater is installed.
Old     (cadunkle)      Join Date: Jul 2009       06-28-2011, 4:13 PM Reply   
180-195 is where engines are most efficient and wear the cylinder walls the least. If you have a closed cooling system with heat exchanger, run a 180*. If you have open/raw water running through your block keep it 145* or whatever your engine manufacturer recommends. One of the main reasons for keeping temp lower in raw water cooled is if you boat is salt or brackish, the salt will crystallize at higher temps and build up on your coolant passages, causing issues long term.


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