Plenum & Oil Hoses

PA220002.JPGWhile I was in the process of replacing my accessory case, I decided to modify the inside of my plenum to even out my CHT’s. I added a small ramp about halfway between the 2 cylinders on the left side of the engine. Before the mod, the back cylinder was cold so the theory is that the ramp will deflect more air towards and through the aft cylinder instead of letting it pass to the back of the plenum. It worked pretty well, actually.

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PA230003.JPG I guess I didn’t take any pictures as I was building these new hoses. I was so disgusted at having to re-do all of them that I just wanted to get it done and not stop for photos.

I ordered brand new Aeroquip AQP fittings and brand new Aeroquip stainless hose. I know you don’t have to use fire shield on stainless lines when used for oil, but stainless really scares me in terms of chafing potential so I went with the fire sleeve. Making hoses out of high quality stuff is REALLY expensive. I hope when I decide to sell my plane the buyer appreciates the difference!

I also pressure-tested 2 out of four of these hoses to 600psi. They really shouldn’t leak or fail again! Two dead stick landings are plenty for me for about the next decade or so!

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