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Ray White
Joined: 02 Dec 2014
Posts: 7269
Location: Derby
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 Posted: Tue Jan 13, 2026 11:32 am Post subject: Unusual coil. |
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This 6 volt 3 amp 'Auto Lite' coil (Ebay) is unlike anything I have seen before. Perhaps someone can explain why there are two HT outlets? Could it be for twin distributors?
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ukdave2002
Joined: 23 Nov 2007
Posts: 4284
Location: South Cheshire
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| Posted: Tue Jan 13, 2026 1:29 pm Post subject: |
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| Probably from a 2 cylinder engine utilising Wasted Spark ignition, eliminates the need for a distributor, possibly from a bike where space is limited. |
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Ray White
Joined: 02 Dec 2014
Posts: 7269
Location: Derby
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| Posted: Tue Jan 13, 2026 2:47 pm Post subject: |
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| ukdave2002 wrote: | | Probably from a 2 cylinder engine utilising Wasted Spark ignition, eliminates the need for a distributor, possibly from a bike where space is limited. |
Thanks for that explanation, Dave.
Harley Davidson for example. |
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Rusty
Joined: 10 Feb 2009
Posts: 290
Location: Bunbury, Western Australia
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| Posted: Wed Jan 14, 2026 12:24 am Post subject: |
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| I have never actually looked, but someone told me years ago that 2CV Citroens fired the plug on both compression and Exhaust, if that is true then they would be the most common type that might use that style of coil! |
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norustplease
Joined: 11 Apr 2011
Posts: 827
Location: Lancashire
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| Posted: Wed Jan 14, 2026 10:09 am Post subject: |
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I think that a 2CV is a Boxer, ie it fires both cylinders simultaneously. The coil is double ended, there is no distributor as such, just a set of points at the front of the engine attached to the camshaft. It only fires on compression.
_________________
1953 Citroen Traction
1964 Volvo PV544
1957 Austin A55 Mk 1
Boring Tucson SUV |
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Ray White
Joined: 02 Dec 2014
Posts: 7269
Location: Derby
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| Posted: Wed Jan 14, 2026 11:56 am Post subject: |
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| norustplease wrote: | | I think that a 2CV is a Boxer, ie it fires both cylinders simultaneously. The coil is double ended, there is no distributor as such, just a set of points at the front of the engine attached to the camshaft. It only fires on compression. |
Both spark plugs fire simultaneously but not both cylinders. The spark firing on the exhaust stroke is wasted. |
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alastairq
Joined: 14 Oct 2016
Posts: 2143
Location: East Yorkshire
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| Posted: Wed Jan 14, 2026 12:52 pm Post subject: |
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IIRC, the coil is double ended on a duck shoveller
_________________
Dellow Mk2, 1951 built, reg 1952.
Fiat 126 BIS
Cannon special [1996 registered. Built in 1950's]
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Ford Pop chassis, Ashley 1172 bodyshell, in pieces. |
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Ray White
Joined: 02 Dec 2014
Posts: 7269
Location: Derby
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| Posted: Wed Jan 14, 2026 3:08 pm Post subject: |
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| alastairq wrote: | | IIRC, the coil is double ended on a duck shoveller |
Having led a sheltered life...I know what a shoveller duck looks like...but what is a "duck shoveller", please? |
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alastairq
Joined: 14 Oct 2016
Posts: 2143
Location: East Yorkshire
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| Posted: Wed Jan 14, 2026 5:49 pm Post subject: |
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| Quote: | | Having led a sheltered life...I know what a shoveller duck looks like...but what is a "duck shoveller", please? |
Hah! Deux Chevaux......Dux chevux...
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Dellow Mk2, 1951 built, reg 1952.
Fiat 126 BIS
Cannon special [1996 registered. Built in 1950's]
----------------------------------------------
Ford Pop chassis, Ashley 1172 bodyshell, in pieces. |
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Ray White
Joined: 02 Dec 2014
Posts: 7269
Location: Derby
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| Posted: Wed Jan 14, 2026 9:32 pm Post subject: |
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| alastairq wrote: |
Hah! Deux Chevaux......Dux chevux... |
Yes, the coil is double ended. The clever thing, of course, is that there is no distributor; no need.
Such a foolproof design. Like everything about those cars it is designed with reliability at it's heart.
If only they were still being made, the world would at least have some sanity left. |
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