Hey all I have a 912 Rotax 80 hp anybody know what the max water temp is. And where do i install a temp sender thinking I might want a gauge for liquid temp. Thanks 

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Comment by Ed Snyder on April 22, 2015 at 1:23am

What is important is the cylinder temp.  About 165 to 230f is the normal range.  I like abound 190/200  max is 285   Water temp does not tell you much, then again where to take the water temp.  Before the radiator (hottest) or after (coolest) ?   Using waterless coolant (Evans) will make the engine run hotter.  

Comment by Lawrence Van Egmond on April 8, 2015 at 4:40pm

Bob is right about monitoring the Cylinder head temps because they are water cooled but coolant temperature can be monitored as well by putting a T fitting in the coolant line and a sensor.

Comment by Bob Pustell on April 7, 2015 at 10:14pm

If your setup is anything like the other Rotax 912 installations I have seen, David, the gage labled Cylinder Head Temp is actually water temp since the heads are water cooled. That gage should really be labled Coolant Temp. I think they do it that way because in the event of a leak and an empty coolant system you would monitor how close to cooked your heads are on that gage. I repeat, I have no personal experience with building a Rotax powered machine but have helped several folks work on theirs so I have some hands-on experience.

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