ak-guy
Senior Member
The 3HM was a raw water cooled engine. My installation which is original by the builder, 30 years ago, uses a keel cooled dry exhaust system. The boat is new to me and is on a trailer and yet to be launched. The previous owner said that the engine runs at 160 degrees and I am aware that raw water cooled engines run at lower temperatures. I am wondering if it would be possible or even desirable to do something to make the engine run at a higher temperature. The engine has two thermostats and I have not investigated yet if higher temperature ones are available.