Mailing List flyrotary@lancaironline.net Message #16575
From: Ernest Christley <echristl@cisco.com>
Subject: Re: [FlyRotary] Re: Moroso Oil Pans for 13B
Date: Thu, 03 Feb 2005 16:04:05 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Bobby J. Hughes wrote:

  I do not see how fins inside the pan would help at all. I may be missing something here.
 

The fins inside would help transfer the heat to the aluminum.  The fins outside help transfer the heat to the air.  You may be thinking that you have to have only a thin sheet between the oil and air to get good cooling, but you really have to break in down to a series of heat transfers.

oil->oil at metal surface->metal surface->through metal->metal surface->air at metal surface->air

The cooling efficiency will be limited to the smallest transfer.  Aluminum offers almost no resistance to the transfer of heat, so the 'fin from inside to outside' setup isn't all that bad.
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