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alternator 6 or 12 volt

Re: alternator 6 or 12 volt

Postby wakeup » Tue Dec 15, 2015 5:39 pm

The unencapsulated stators, like the one shown here are fairly unreliable. The one on my 650ss fell apart in the middle of an ACU National Rally in the mid 70s. The coils become loose and the connections fall apart. It's why they (Lucas) went to encapsulated alternators fairly quickly. Thank God for magnetos!!
For my money, replacing the alternator would be towards the top of the New Bits Required list.
cheers
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Re: alternator 6 or 12 volt

Postby chrisf1 » Mon Dec 21, 2015 4:39 am

Hi again I am about to order my new alternator and it is an encapsulated RM 21 please bear in mind I intend running one of these Boyer Bransden capacitor power packs eventually to do away with the battery should I go for one with more power output or should this be sufficient, also I have seen that the rotors differ in size mine is 70mm diameter was this changed when they moved to encapsulated alternators or are they the same size ? many thanks Chris

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Re: alternator 6 or 12 volt

Postby L.A.B. » Mon Dec 21, 2015 6:27 am

chrisf1 wrote:also I have seen that the rotors differ in size mine is 70mm diameter was this changed when they moved to encapsulated alternators or are they the same size ?


The rotor for the encapsulated (and late unencapsulated) stators is 2.7/8" (72mm) diameter, so yours is probably correct, however, if the rotor is anywhere near as old as the stator then it's likely to have lost some of its magnetism by now which will reduce output.
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Re: alternator 6 or 12 volt

Postby chrisf1 » Mon Dec 21, 2015 8:40 am

I have no idea how to measure magnetism but it is pretty strong I keep it in a sealed bag as everything sticks to it and does not come off easily should I replace to be safe cheers Chris

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Re: alternator 6 or 12 volt

Postby L.A.B. » Mon Dec 21, 2015 9:05 am

chrisf1 wrote:I have no idea how to measure magnetism


If the rotor will cling to a screwdriver blade without falling off when lifted from the bench, then it's probably OK (check each magnet), but it may still not be as good as a new one.
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Re: alternator 6 or 12 volt

Postby chrisf1 » Mon Dec 21, 2015 11:01 am

I assume you mean pick it up with the screwdriver it doesn't so a new rotor as well !!!! what about output standard be sufficient or high output ? thanks Chris

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Re: alternator 6 or 12 volt

Postby L.A.B. » Mon Dec 21, 2015 11:33 am

chrisf1 wrote:what about output standard be sufficient or high output ?


I would expect a new Lucas (or Wassell/Emgo) rotor to be adequate-although Sparx say their rotors have higher power magnets that increase output, however, I've never used one-so I can't say if they increase output significantly or not?
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Re: alternator 6 or 12 volt

Postby Frankie17 » Mon Jan 25, 2016 9:44 am

The encapsulated rotors style Lucas rotors are all 74mm diameter LAB did quote 72mm ?

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Re: alternator 6 or 12 volt

Postby chrisf1 » Mon Jan 25, 2016 11:35 am

I will be getting a pair anyway but there is a high output (16 amp) 2 wire 12 volt stator advertised on ebay ( 161907235239 ) which for roughly the same price as standard seems worth a punt as I am going with Boyer or similar electronic ignition as well and if they tell me it will work, one of there power boxes so I can do without a battery, opinions welcomed many thanks Chris

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Re: alternator 6 or 12 volt

Postby chrisf1 » Wed Apr 20, 2016 10:19 am

Thanks for your replies everyone I now have my new encapsulated rotor and stator and also the 2 half circle rings which obviously fit between the rotor and stator but can anyone tell me how to fit them without getting brutal as it seems to make fitting impossible many thanks Chris

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Re: alternator 6 or 12 volt

Postby L.A.B. » Wed Apr 20, 2016 2:45 pm

chrisf1 wrote:Thanks for your replies everyone I now have my new encapsulated rotor and stator and also the 2 half circle rings which obviously fit between the rotor and stator but can anyone tell me how to fit them without getting brutal as it seems to make fitting impossible many thanks


I'm not sure what you mean by half circle rings? :?

Do you mean the two semi-circular sheet metal 'magnet keeper' plates that often come attached to new rotors by any chance?

If so, they should be removed and discarded as there must be a gap of approximately .008" between rotor and stator.

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Re: alternator 6 or 12 volt

Postby chrisf1 » Wed Apr 20, 2016 11:31 pm

I knew they were not on the old one thanks Chris

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Re: alternator 6 or 12 volt

Postby chrisf1 » Sat Apr 23, 2016 10:17 am

Hi again everyone yet another problem with the alternator what a pain this is I will start a new thread and head it more alternator problems

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Re: alternator 6 or 12 volt

Postby chrisf1 » Tue May 10, 2016 9:37 am

Hi L.A.B. or anyone who knows which colour replaces which you previously sent me some info on my alternator (quote)
Those "green and cream" wires are in fact green/yellow, and green/white! The other being a green/black.
If the green/yellow and green/white wires are connected together ahead of the rectifier then it should operate as a 12V stator.

I have now upgraded to a 12v encapsulated type also 3 wire but the colours are different they are yellow, red. green can you tell me how I should connect them thanks Chris

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