Engine room ventilation

[DeepFrz]

I believe that most engine manufacturers specify the operating temp. not greater than 125 f.

If you have anything else in the compartment then you are cooking it.

[puffcard]

I'm in the group that runs the blower if the motor is running and I run it after for 30 minutes. I know the engines, the alternator and transmission all run better if cooler, so why not. The blower doesn't cost me anything to run, while those components are very expensive. My blower pulls from the top of the engine compartment and have a inlet hole by the 100 amp alternator. Also the blower exits right by the helm and can give you the added info of clean air (no smoke) coming out of the engine room. Plus in the winter I can warm my hands.

[DeepFrz]

I meant to say "ambient" air temp. 125 f.

[EXTENDBC]

Hi jr_spyder. Would be worth taking a look at JEC Marine too who are specialists in DC Brushless Engine room ventilation fans. Boat Engine Room Ventilation Fans and Marine Pumps*| JEC Marine. Also some good advice on the advantages of using DC over AC systems here: Using DC vs AC Generator | JEC Marine/ If it's a question of engine room space etc.

[daysgoneby]

Venting the Engine room
https://www.proboat.com/2015/06/venting-the-engineroom/

[David M]

Engine spaces need both passive ventilation using convection and active ventilaton using a blower.

Cummins specified a maximum difference between the ambient outside air temperature and the inside air temperature with just convective cooling alone.

You may have to do quite a bit of work so that your engine space adequately cools using convective cooling.