What thermostat do you run?

Wildboating

I apparently have a 160 t-stat in my 350 mag engines, why so hot?  What are you running in yours?

Handymans342

160 in my diesels too. Thought it would be 190 at least

Liberty44140

Are you fwc or Rwc? Believe fwc should be hotter. 

skennelly

My same engine normally run 158 degrees on my vessel view mobile.

Wildboating

FWC OR RWC??  Not sure what we are talking about

Liberty44140

Fresh water cooled - you have a heat exchanger. Raw water cooled - no heat exchanger. 

Wildboating

Raw water, i dont have horizons.

skennelly

To clarify...mine is rwc and runs 158 degrees

Cableguy Greg

My 6.2 is RWC and runs at 160* via VVMobile app. I believe the 160* stat is what is supposed to be in the engine.

Dude_Himself

Marine engines commonly use 160° thermostats to provide more complete combustion and increase fuel economy. Any hotter (190°) and gas pockets could form, and at lower temps there's more unburnt hydrocarbons in the exhaust, which equates to fuel in the water.