Engine Room Cooling Upgrade

10 thoughts on “Engine Room Cooling Upgrade”

  1. Did you make any adjustments to allow more air flow into the engine room? Or where does the make up air come from?
    Looks great.


    1. Michael – Thanks for your question and comment. On the 55s and 60s, there are two ER intake vents on the aft corner of the house, either side of the cockpit door. These openings are plenty big to bring the air in to the ER and actually well placed for where the fans are located. As the fans pull air up the stack enclosure (located above the engine and in the forward portion of the ER), it is pulling the air in from the aft ends of the ER, across the engine.


  2. Very impressive, Kevin! I salute you for a job well done!

    When we began struggling with high engine room temperatures just a few weeks after taking delivery of N4732 in 2005, I learned that the standard-issue squirrel cage fans are very inefficient at pushing air against high head pressure–as in up or down a long hose. Axial fans are what’s needed for a job like that. We fitted a single axial fan to suck air into our ER through the starboard cockpit plenum. That worked fine. HOWEVER, the incoming air was deposited in the after starboard corner of the ER and with more air being pushed in it had to find an easy way out. The natural path for that was out the port side plenum. What that meant was the cool incoming air circulated nicely in the after part of the engine room, but it did little to cool the area surrounding the ER’s big heat-generator: the main engine. Solution: we added 16-inch ducting from the axial fan to the main engine, not pretty but highly effective. That dumped the incoming cool air right at the main engine, forcing the hot air there aft and out the port side plenum. It’s been working like that for 13 years and our ER’s delta-T (temperature differential from outside air) is about 30 deg. F.

    Milt, N4732 Bluewater


    1. Milt – thank you! A fun project that will be enjoyed for years to come. As has been discussed on the NOG, each model is different and needs to have their own solution. I was fortunate enough to have Peter be the trailblazer for the 55/60s.


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