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From: <sqpilot@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-828612@logan.com>
Subject: Re: [FlyRotary] AN fittings..
Date: Wed, 30 Mar 2005 11:12:55 -0600
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Hi, David....this subject came up recently on the Canard Aviator's site. A 
few builders stated that they received their Lycoming engines with aluminum 
fittings on them. The general consensus was that larger fittings were fine 
in aluminum, but most people felt that for the smaller fittings, aroung one 
quarter inch, they would feel better with steel. Hope this helps.  Paul 
Conner

----- Original Message ----- 
From: "David Staten" <Dastaten@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, March 29, 2005 10:12 AM
Subject: [FlyRotary] AN fittings..


>I was perusing the Velocity manual online (sorry, not a public site) and 
>came across a statement with regards to AN fittings needing to be steel if 
>they are situated ON the engine. This was in the context of the lycoming 
>installation instructions, and plumbing the "per plans" oil cooler in the 
>nose to the engine in the back.
>
> The direct quote is "all fittings that are attached to an engine need to 
> be steel fittings. Aluminum fittings are not acceptable." Its in bold.
>
> Considering I am going to be sending the oil  into a fitting that is 
> connected to an aluminum bypass block on the pedestal, in OUR (rotary) 
> situations is this a critical issue? And what is/was the rationale for not 
> using AL fittings on the Lyc's? Dissimilar metals? Heat expansion 
> stresses? Fatigue?
>
> Dave
>
>
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