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cooperess
 Post subject: IGNITION COIL 1969
PostPosted: Sun Nov 13, 2022 3:34 pm 
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1098cc
1098cc

Joined: Wed Sep 30, 2015 9:38 am
Posts: 1572
Location: Brandy Hill, NSW
1969 Mini Cooper S Mk2 which is unmodified.

I think my ignition coil has packed up.

Symptoms are the coil is getting super hot and engine is cutting out.

What are the tests I can do to check the coil?

What is the type of replacement coil I can get?
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gtogreen1969
 Post subject: Re: IGNITION COIL 1969
PostPosted: Sun Nov 13, 2022 4:35 pm 
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1275cc
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Joined: Fri May 02, 2008 3:07 pm
Posts: 5123
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Check the primary windings by sticking an ohmeter on the + & - terminals. Resistance should be about 3 ohms.

The secondary windings are checked by the + terminal and the HT lead outlet. Reading would be around 10k and 15k ohms

Overheating can be from a short or loss of cooling oil.

There should be a few how to videos on YouTube if you get stuck


Last edited by gtogreen1969 on Wed Jan 25, 2023 5:53 pm, edited 1 time in total.

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cooperess
 Post subject: Re: IGNITION COIL 1969
PostPosted: Sun Nov 13, 2022 5:16 pm 
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1098cc
1098cc

Joined: Wed Sep 30, 2015 9:38 am
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Location: Brandy Hill, NSW
Checked the primary windings by sticking an ohmeter on the + & - terminals. Resistance 0.00 ohms.

The secondary windings are checked by the + terminal and the HT lead outlet. Reading is 5.50 ohms

No oil loss.
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gtogreen1969
 Post subject: Re: IGNITION COIL 1969
PostPosted: Sun Nov 13, 2022 5:25 pm 
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1275cc
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Posts: 5123
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cooperess wrote:
Checked the primary windings by sticking an ohmeter on the + & - terminals. Resistance 0.00 ohms.

The secondary windings are checked by the + terminal and the HT lead outlet. Reading is 5.50 ohms

No oil loss.


Chuck it out
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68+86auto
 Post subject: Re: IGNITION COIL 1969
PostPosted: Sun Nov 13, 2022 5:45 pm 
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998cc
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Posts: 601
Location: Brisbane Northside
If those measurements are accurate then it is bad for sure.

_________________
1986 Mayfair (998 auto), 1974 S, 1974 Van, 1972 PMG Van

Too many minis
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cooperess
 Post subject: Re: IGNITION COIL 1969
PostPosted: Sun Nov 13, 2022 5:48 pm 
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1098cc
1098cc

Joined: Wed Sep 30, 2015 9:38 am
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Location: Brandy Hill, NSW
Ok = out it goes.

Any idea where to get a replacement?
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jaybee
 Post subject: Re: IGNITION COIL 1969
PostPosted: Sun Nov 13, 2022 6:09 pm 
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848cc
848cc

Joined: Mon Apr 25, 2022 6:38 pm
Posts: 73
Almost anywhere you can get one. Only thing you need to know is the voltage it’s designed for and does it use a ballast resistor.
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DavidE
 Post subject: Re: IGNITION COIL 1969
PostPosted: Sun Nov 13, 2022 6:19 pm 
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998cc
998cc

Joined: Mon Jan 12, 2015 10:59 pm
Posts: 985
Location: Holt ACT
cooperess wrote:
Ok = out it goes.

Any idea where to get a replacement?


minisport.com.au/search/?q=coil
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drmini in aust
 Post subject: Re: IGNITION COIL 1969
PostPosted: Sun Nov 13, 2022 6:23 pm 
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW
Its a Lucas 12H. 3 ohm no resistor.
I had a good run with Bosch GT40 instead on my S.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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timmy201
 Post subject: Re: IGNITION COIL 1969
PostPosted: Sun Nov 13, 2022 6:41 pm 
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1275cc
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Joined: Sun Apr 29, 2012 1:19 pm
Posts: 4494
Location: Wollongong, NSW
As long as it’s 3ohm with a standard 1969 electrical system it’ll work fine. If you have points it’s worth checking the dwell time (points gap) is correct as this can contribute to the coil overheating

Tony at Auto Electrics on Wheels (ausmini “convertible mini”) is always super helpful and quick with post & knows exactly what you’ll need

Auto Electrics on Wheels
Tel: (07) 5546 9065
Email: [email protected]

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Firefirey
 Post subject: Re: IGNITION COIL 1969
PostPosted: Mon Nov 14, 2022 3:47 pm 
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848cc
848cc

Joined: Fri Mar 13, 2009 7:41 pm
Posts: 493
Location: New Zealand
drmini in aust wrote:
Its a Lucas 12H. 3 ohm no resistor.
I had a good run with Bosch GT40 instead on my S.


Should that be Lucas HA12
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drmini in aust
 Post subject: Re: IGNITION COIL 1969
PostPosted: Mon Nov 14, 2022 4:45 pm 
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religious status
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW
Firefirey wrote:
drmini in aust wrote:
Its a Lucas 12H. 3 ohm no resistor.
I had a good run with Bosch GT40 instead on my S.


Should that be Lucas HA12

Yea it is I had a brain fart sorry.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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