In a message dated 3/29/2005 10:14:16 AM Central Standard Time, Dastaten@earthlink.net writes:

<< 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 >>

Fatigue. Aluminum has a short fatigue life. The engine is moving around on the mount all of the time. All hose runs to the engine should have a curve and some slack in them to account for this movement. The hose is clamped away from the engine with Adel or as part of another hose end as in a bulkhead fitter or similar. Refer to your hose catalogue for acceptable methods of installation. Lynn E. Hanover