[Orv Neisingh]

In the summer time
Many of our helicopter engines run hot so I have been installing this simple modification for years now and it works great. The common way most owners have used is to piggy back an auxiliary oil cooling radiator above or below the coolant radiator. This helps a little bit but either the aux cooler is being cooled by hot air that has been heated by the radiator or the radiator is being cooled by hot air from the aux oil cooler.

The simplest and most effective solution that I have found is to add an 18” transmission cooler pictured below. It is a simple add on with all plumbing exposed and easy to inspect. It also lies just inside of the lower passenger side body cut out so it is cooled by unheated air flowing into that opening with no need for a fan.

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For clarity.

[Tim Morris]

Kasey put one of those on my ship as well.  I found that it did not work well keeping the engine oil cool while training my bride to hover.  I would guess it did not have enough airflow in a hover.  I changed to this unit and it seems to be doing a better job.

[Orv Neisingh]

You got it right Tim, it needs air flow to carry the heat away.