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Home made spark test gap block and magnetiser
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DM



Joined: 21 Dec 2008
Posts: 209
Location: North Cornwall

PostPosted: Sat Dec 29, 2018 1:26 pm    Post subject: Home made spark test gap block and magnetiser Reply with quote

I have been looking out for a 3 electrode ignition spark gap block for ages,
could not find one to buy so made my own.


Last edited by DM on Mon Jan 18, 2021 9:30 pm; edited 3 times in total
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badhuis



Joined: 20 Aug 2008
Posts: 1191
Location: Netherlands

PostPosted: Sun Dec 30, 2018 10:52 am    Post subject: Reply with quote

What use does this have?
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Bitumen Boy



Joined: 26 Jan 2012
Posts: 1493
Location: Above the snow line in old Monmouthshire

PostPosted: Sun Dec 30, 2018 12:34 pm    Post subject: Reply with quote

This isn't something I've come across before, I'd be interested to know more about it.
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DM



Joined: 21 Dec 2008
Posts: 209
Location: North Cornwall

PostPosted: Sun Dec 30, 2018 12:51 pm    Post subject: Reply with quote

When bolted to this 50's Octopus test bench -

I can test run a magneto from 0 to 6000rpm, which means I can check-

Minimum speed the mag will spark at
The advance curve
Points bounce
Wear on cam to make sure all cylinders are timed right
Spark voltage

I can also warm the mag up to make sure it still sparks when hot

The Octopus can test dynamo's, alternators and starter motors as well


Last edited by DM on Sun Jun 14, 2020 11:18 pm; edited 2 times in total
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Rick
Site Admin


Joined: 27 Apr 2005
Posts: 21707
Location: UK

PostPosted: Sun Dec 30, 2018 5:31 pm    Post subject: Reply with quote

Very interesting, not unlike the rig that my mag was tested on a few years back.

RJ
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Rick (OCC Admin)
Various 1920s-1960s - Austin, Morris, Commer, Dodge etc.
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RogerB



Joined: 18 Dec 2014
Posts: 177
Location: Suffolk Coastal. U.K.

PostPosted: Sun Dec 30, 2018 9:50 pm    Post subject: Octopus test rig Reply with quote

DM,

I write articles for several classic car club magazines and I would like to write about the test rig you have. Is it possible I could have a photo of the rig and a bit of information about?

Thank you,

RogerB
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Rick
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Joined: 27 Apr 2005
Posts: 21707
Location: UK

PostPosted: Sun Dec 30, 2018 11:18 pm    Post subject: Reply with quote

This was the unit that little Dodge's mag was tested on, you can just see one spark jumping between a pair of contacts



RJ
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Rick (OCC Admin)
Various 1920s-1960s - Austin, Morris, Commer, Dodge etc.
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DM



Joined: 21 Dec 2008
Posts: 209
Location: North Cornwall

PostPosted: Mon Dec 31, 2018 12:12 am    Post subject: Re: Octopus test rig Reply with quote

RogerB wrote:
DM,

I write articles for several classic car club magazines and I would like to write about the test rig you have. Is it possible I could have a photo of the rig and a bit of information about?

Thank you,

RogerB


Roger I have a bit more work to do making up a set of leads befor it is useable, once I have that done I'll take some photo's and sort some info out.

In the meantime here is a pic of the complete set up.


Last edited by DM on Sun Jun 14, 2020 11:22 pm; edited 2 times in total
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alanb



Joined: 10 Sep 2012
Posts: 514
Location: Berkshire.

PostPosted: Mon Dec 31, 2018 10:39 am    Post subject: Reply with quote

What a wonderful piece of kit, looks like it should belong in a 50s sci fi film
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RogerB



Joined: 18 Dec 2014
Posts: 177
Location: Suffolk Coastal. U.K.

PostPosted: Mon Dec 31, 2018 5:03 pm    Post subject: Reply with quote

DM,

A very impressive piece of equipment.....!
Any chance of emailing me a copy of the photo please; I feel an interesting article coming on.....!

RogerB
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DM



Joined: 21 Dec 2008
Posts: 209
Location: North Cornwall

PostPosted: Sun Jun 14, 2020 11:34 pm    Post subject: Reply with quote

Ony took me a year but found space at home for the Octopus.

Testing a mag shows up erratic spark and excessive sparking at the points, then loses spark at 1400rpm.

Hopefully fitting a new condenser will sort it.





And another little ongoing side project
A pulse magnetiser being made from a cut down spot welding transformer



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DM



Joined: 21 Dec 2008
Posts: 209
Location: North Cornwall

PostPosted: Mon Jan 18, 2021 9:28 pm    Post subject: Reply with quote

I have got the magnetiser working, using parts I had lying around I ended up with a 500 volt DC supply.

That give me over 90,000 ampere turns, experimenting with it I managed to reverse the poles of a horseshoe magnet and then put it back to it's original polarity.

Need to get a gaussmeter before I try it on a magneto magnet as I would like to be able to measure any improvement in the magnetic field.

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