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General => Douglas Motorcycles - General Discussion => Topic started by: joeis6 on 07 Jan 2015 at 09:25

Title: magneto
Post by: joeis6 on 07 Jan 2015 at 09:25
I have been making these clips to attach the plug leads to the magneto pickups, they took a long time, and  why does this da2 magneto have three pickups?
Title: Re: magneto
Post by: cardan on 12 Jan 2015 at 11:59

Nice little doo-dads - my 1910 FN four uses these for the HT cables from the Bosch FN10 magneto to the distributor and from the distributor to the plugs (at the distributor end). Did you make tooling, or make them "by hand"?

As for the three pick-ups - no idea! Give us a clue. Is the brass strip on the slip ring a complete circle or segmented? How many ramps are there on the points? (One or two are the normal possibilities.)

I'd comment on the car but (a) we'd get into trouble and (b) it's too modern for me anyway!

Cheers

Leon
Title: Re: magneto
Post by: graeme on 12 Jan 2015 at 13:09
Could the third "pick up" be for an ignition cut-out?
Title: Re: magneto
Post by: cardan on 12 Jan 2015 at 23:29

Good idea Graeme. The cut-out was usually on the primary circuit at the points end, but it's an early magneto. Twin with cut-out?

Leon
Title: Re: magneto
Post by: Douglas52 on 13 Jan 2015 at 09:14
Looks like an external HT earth.
Title: Re: magneto
Post by: joeis6 on 13 Jan 2015 at 10:10
hello Leon I made the plug lead ends using tools from a man who has  an FN. He had an example of an     original which was very useful he found he could not make them in brass so made his out of copper and they turned out very well. I persisted with brass which I annealed twice and punched into a sphere. after several rejects success. there is also a small spring made from piano wire riveted inside.
the mag has a segmented slip ring and the cam has two lumps at 180 degrees. The photo of the car was a mistake only noticed after the post I was very relieved to see it was not of a pregnant wife in the bath.  Neale
Title: Re: magneto
Post by: cardan on 14 Jan 2015 at 09:44

The mind boggles - nice car but I'm sure your wife looks good too.

So the third pick up is a means of shorting out the sparks. I wonder what year the maggie is - it can be dated from the serial number if you care to post it.

The mag looks small in the photo. Is it "Douglas size"? There were of course many types of flat twin motors with a range of applications.

Leon
Title: Re: magneto
Post by: joeis6 on 15 Jan 2015 at 05:05
the number is from 1911 , it fits onto the douglas mounts fine but the drive end oil cap is masked by the douglas casting,it requires something like a small crewdriver to open its cap