Tuesday, August 10, 2010

Things that go bump in the night

If it weren't 1,000 degrees in the Twin Cities with ridiculously high humidity doing so, it'd be the engine on the RV-7A project that keeps me up at night.

As regular readers know, I've been working my way from the tail of the airplane to the front for final assembly. With the avionics now -- mostly -- done, the only things left (other than fairings) to get the airplane flying is (a) the engine (b) the cowling and (c) the propeller. All are pretty important, from what I've been able to understand.

Over the course of the coming winter (which can't get here soon enough), I'll be working on the various lines for the engine.

I'll start with the the fuel line from the engine-driven fuel pump to the fuel servo. And, because this is me, I've already run into a problem. See if you can spot it.

Give up? Look closer.

Pay no attention to the black hose, that's simply a support hangar for the Vetterman exhaust. It's the brown hose. As it comes out of a T-fitting at the fuel pump and winds its way forward, it's striking the engine mount. Angling the T-fitting doesn't change anything, because the engine mount is parallel to the longitudinal axis of the plane and it'd keep hitting.'

I suppose I could clamp it -- somehow -- but the engine is going to be vibrating and don't I want the hose to be free enough to "give" from the constant vibration.

Also, I'm looking for anyone who has a good Web site documenting the installation of the Grand Rapids Technology EIS 4000 in an IO-360 engine. The instructions aren't bad, but they're not as good as they could be, and I learn by seeing rather than by reading and guessing.

Update - It occurred to me that perhaps I could swap the two ports out of the fitting that goes into the fuel pump. Alas, no dice. They're separate fittings.

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