Un-Shielded Plug Shielded Covers

[VictorBravo]

The other day I saw a T-craft that had special machined covers that allowed un-shielded plugs to be used with a shielded ignition harness. They were machined and welded aluminum tubes that the top plugs went into, then had a cap screwed on to cover the top of the plug. These little jewels allowed you to use the short plugs with a shielded ignition system, and NOT have the bumps on the cowl.

I thought this was perhaps the coolest thing I've ever seen. Use a radio, have a smooth cowling... what a concept! The owner said they were Taylorcraft parts, specially built for this specific purpose.

Does anyone know how/where.if I can find a set of these covers? Are they really original T-craft accessories that can go on a certified airplane? How many gold dubloons would someone have to fork over for a set of them? Are the drawings available to make them?

Bill Berle

[paulp]

Re: Un-Shielded Plug Shielded Covers

Howdy Bill,

Someone, somewhere told me about plug caps that would allow the user to utilize the shorter plugs but I couldn't find out anything more.

I sure hope someone responds with a supplier.

[Hank Jarrett]

Re: Un-Shielded Plug Shielded Covers

They are called "Erocoupe Cups" and you see them in the Fly market every once in a while. I got a set at Oshkosh a few years ago for about $10 each. There are plans in the Taylorcraft newsletter a few years back to make them from easier material than a solid bar of aluminum. Contact me off line and I will try and dig them up and mail a copy to you. You really only need them for the front two top cylinders for clearance but if you exchange the MAg cap for an unshielded one you end up with 4 unshielded plugs. Anybody know the legality of putting two unshielded leads on a mag with the other two shielded? Any problem with 6 shielded plug and 2 unshielded? I'm talking FAA problems here, I doubt the fuel knows the difference when the plug fires.
Hank Jarrett
[email protected]

[TimHicks]

Re: Un-Shielded Plug Shielded Covers

Here is a picture of the spark plug cups in a Taylorcraft here in South Louisiana.

[mhorowit]

Re: Un-Shielded Plug Shielded Covers

so the spring at the end of the wire just presses against the center post of the 'plug? what keeps it from slipping off or is the distance just too short - Mike

[lktiller]

Re: Un-Shielded Plug Shielded Covers

The plug slips into the top of the cup then screws into the cyl. Don't use a copper gasket, the cup base is the gasket. Same torque.

The wire screws into the side of the cup pressing the spring against the plug. No chance of it backing out unless the grommet is not installed.

then the cup cap is screwed into place and wiretied.