Lucus 11ac alternator
Posted: Sun Jul 02, 2023 8:19 pm
Hi has any ever fitted a small lucus 11ac alternator to a A series mini?
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Lucus 11ac alternator
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Re: Lucus 11ac alternator
Posted: Sun Jul 02, 2023 8:26 pm
Whatever it is, the alternator on your pictue is not an Lucas 11AC alternator...
Re: Lucus 11ac alternator
Posted: Sun Jul 02, 2023 8:50 pm
OK thanks . They used to use them on the cooper s back in the day . What do they look like?
Re: Lucus 11ac alternator
Posted: Sun Jul 02, 2023 9:11 pm
Wiring diagram neg earth > https://mk1-performance-conversions.co. ... ac-neg.pdf
Positive earth and more under electrical here > https://mk1-performance-conversions.co. ... ection.htm
They were used by Abingdon on the works cars, they use a separate 4TR control unit (regulator) as opposed to an integrated one.
They were standard fitment on a lot of vehicles 60's-70's
https://www.heritagerotating.co.uk/prod ... ternators/
Re: Lucus 11ac alternator
Posted: Sun Jul 02, 2023 9:15 pm
Hi there, the 11ac alternator could not be described as “small”, it’s chunkier than an “acr” alternator. This picture shows the cast alloy bracket that fits it to the block and on “works” cars the front panel was cut away to allow easier fitting and removal.
Re: Lucus 11ac alternator
Posted: Sun Jul 02, 2023 9:23 pm
Ah yes. Thanks for clearing that up. Appreciate the image.
Rob
Rob
Re: Lucus 11ac alternator
Posted: Mon Jul 03, 2023 6:54 am
I do dont think the 11AC was a “Works” Alternator as such, it was fitted to various vehicles back in the day - inc Vans and lorries.
There are various types as well, inc right and left fitting and neg and pos earth……
As far as I know they all need a separate regulator box as well.
The “Works” may of fitted specific parts though (I am not sure ) like brackets ?
One to be careful buying….
There are various types as well, inc right and left fitting and neg and pos earth……
As far as I know they all need a separate regulator box as well.
The “Works” may of fitted specific parts though (I am not sure ) like brackets ?
One to be careful buying….
Re: Lucus 11ac alternator
Posted: Mon Jul 03, 2023 8:31 am
My cop car had an 11 AC alternator fitted, with seoarate regulator (mounted on right hand side of scuttle panel). I machined the insides of the old 11AC to accept 18ACR guts.
Re: Lucus 11ac alternator
Posted: Mon Jul 03, 2023 9:59 am
Well let us just say Abingdon fitted 11 AC'sExminiman wrote: ↑Mon Jul 03, 2023 6:54 am I do dont think the 11AC was a “Works” Alternator as such, it was fitted to various vehicles back in the day - inc Vans and lorries.
There are various types as well, inc right and left fitting and neg and pos earth……
As far as I know they all need a separate regulator box as well.
The “Works” may of fitted specific parts though (I am not sure ) like brackets ?
One to be careful buying….
This was published in MotorSport April 1966. 
It was of course won by Rauno Aaltonen 
Re: Lucus 11ac alternator
Posted: Mon Jul 03, 2023 11:18 am
Lucas used the Abingdon works as test beds for theirt alternators for durability and the soaking that they'd be subject to. They did want to use Army mid range vehicles such as Land Rovers (The Bedfords were starting to use the big AC Delco alternators) but seemingly, the MoD didn't want its operational fleet used as guinea pigs.
Re: Lucus 11ac alternator
Posted: Mon Jul 03, 2023 4:39 pm
I was not saying that the "Works" didn`t fit them, just that they were also fitted to a number of other vehicles as well - so not a special "Works" only item ...Ronnie wrote: ↑Mon Jul 03, 2023 9:59 amWell let us just say Abingdon fitted 11 AC'sExminiman wrote: ↑Mon Jul 03, 2023 6:54 am I do dont think the 11AC was a “Works” Alternator as such, it was fitted to various vehicles back in the day - inc Vans and lorries.
There are various types as well, inc right and left fitting and neg and pos earth……
As far as I know they all need a separate regulator box as well.
The “Works” may of fitted specific parts though (I am not sure ) like brackets ?
One to be careful buying….
Re: Lucus 11ac alternator
Posted: Wed Jul 05, 2023 5:29 pm
Any details what was used on Work's cars , positive or negative ground and the reason why?
Thanks Cpr1
Thanks Cpr1
Re: Lucus 11ac alternator
Posted: Wed Jul 05, 2023 7:12 pm
Early cars positive ground (because that is the way that they were in production), I suppose they changed to negative earth when it came into production Mk2 possibly
They changed it I believe to do with electron flow & its effects on body corrosion.
Re: Lucus 11ac alternator
Posted: Wed Jul 05, 2023 7:39 pm
Is it just a myth or reality that pisitive ground effects corrosion?
Re: Lucus 11ac alternator
Posted: Wed Jul 05, 2023 7:50 pm
Re: Lucus 11ac alternator
Posted: Thu Jul 06, 2023 7:10 am
In mid 60s significant proportion of the BMC vehicles using 11AC as a “Standard part” were commercial, I wonder if it had any thing to do with influence from Leyland ?Peter Laidler wrote: ↑Mon Jul 03, 2023 11:18 am Lucas used the Abingdon works as test beds for theirt alternators for durability and the soaking that they'd be subject to. They did want to use Army mid range vehicles such as Land Rovers (The Bedfords were starting to use the big AC Delco alternators) but seemingly, the MoD didn't want its operational fleet used as guinea pigs.
They were also using a combination of positive and negative earth….I suppose, it depended on when the model was released.
Re: Lucus 11ac alternator
Posted: Thu Jul 06, 2023 8:05 am
my memory from the mid 60,s .. Alternators were seen as not suitable for Cars as the Lucas Alternator were 12v negative earth & they supplied 24v battery packs .. Leyland Industrial Engines ( 6 & 4 cyl: ) that we installed in new built Mobile Cranes all had Lucas Alternators & there was never an issue with reliability.