miniature spark plug connectors

[martin perman 1Participant @martinperman1]

[martin perman 1Participant @martinperman1]

Gentlemen,

I've treated myself to a small hit and miss open crank engine, it has a tiny spark plug similar to those that are fitted to model aircraft engines, can anybody point me towards a plug cap that I can use instead of the current method of jamming the wire to the plug by plastic tube.

Martin P

[JasonBModerator @jasonb]

I use the ones from S/S on the 1/4 x 32 plugs. The clear silicon boots look OK on more modern engines, the split brass ones are better on period engines though he is winding up the business

 

Edited By JasonB on 15/12/2020 19:04:15

[martin perman 1Participant @martinperman1]

Jason,

Thanks to that, the brass ones look similar to what I use on full size engines.

Will measure tomorrow and send an email.

Martin P

[pgk pgkParticipant @pgkpgk17461]

I see that 'justengines' do a glowplug size spark plug. I don't see a plug cap for it on their site but in the days when i flew r/c they were always very helpful/knowledgeable and it'd save importing

pgk

[V8EngParticipant @v8eng]

Posted by martin perman on 15/12/2020 18:43:08:

Gentlemen,

I've treated myself to a small hit and miss open crank engine, it has a tiny spark plug similar to those that are fitted to model aircraft engines, can anybody point me towards a plug cap that I can use instead of the current method of jamming the wire to the plug by plastic tube.

Martin P

Al’s Hobbies in Milton Keynes might be a potential source, a quick search should find his website

[Clive FarrarParticipant @clivefarrar90441]

There are several ways to do this and it depends how good you want it to look and how much effort you are prepared to put in.

1) take a single section of choc block screw wire into one side and spark plug tip into the other.

2) take an "R" clip that is a good fit to your plug tip, rough the end of the straight leg and solder your wire to it.

3) take a piece of brass tube circa 6mm dia 10 mm long.

Turn a bush for it with a hole the diameter of your plug lead wire through the centre and solder into one end of the tube.

Cross drill though the OTHER end of the tube on ONE side only a hole the size of you plug cap.

turn a small TOP HAT bush that will fit and slide smoothly inside your tube. Countersink the "BRIM " end.

Pass your lead through and solder the bare end to the brim making sure there is a nice pillow of soft solder over the brim.

Fit a small section of biro spring over your wire and up to the BRIM on the opposite side of the solder and fit the end of the wire though the open end of your made tube and out through the bush end.

To apply pull the wire into the tube, fit it over the end of the plug and release the pillow of soft solder will grip the end of the plug. sorted

If you would like a diagram PM me with an e mail address , its to hard to do it on here.

regards Clive

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