Author Topic: 12 volt  (Read 5481 times)

Richard

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Re: 12 volt
« Reply #15 on: 10.04. 2009 08:33 »
Tone
Paul Goff home web page link below

http://www.norbsa02.freeuk.com/index.htm
Richard

Offline LJ.

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Re: 12 volt
« Reply #16 on: 10.04. 2009 10:31 »
Trev...

Quote
In fact, there are 2 different MCR2 types with differing number of turns on the regulator, one type for the E3L and the other for the E3H, E3N etc.

Indeed there are two types of MCR2 regulators and I have been wondering why the differencies. I've recently upgraded my BSA M21... (Sorry about getting away from A10s and straying off thread topic!)

... From a short dynamo (40 watts) to longer dynamo (60 watts) Not realising that when doing this the regulator also has to be changed from an MCR1 to MCR2. But I have two MCR2 regulators and both are different as you mention, in fact at one time I did not know if they were earlier or later ones? So can you tell me please which is which in the photo's? and the one I need for my longer E3L.

The left one has no markings on it at all.
Ride Safely Lads! LJ.
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1940 BSA M20 500cc Girder/Rigid- (SOLD)
1947 BSA M21 600cc Girder/Rigid-Green
1949 BSA A7   500cc Girder/Plunger Star Twin-(SOLD)
1953 BSA B33  500cc Teles/Plunger-Maroon
1961 BSA A10  650cc Golden Flash-Blue
1961 BSA A10  650cc Golden Flash-Red

Online groily

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Re: 12 volt
« Reply #17 on: 10.04. 2009 14:17 »
Mine to add to Fido's too Trev - very happy to be put straight on that.
Not sure about the different types of CVC though LJ- have had sealed ones and ones with removable lids, ones for short dynamos and for long  .. . but they're all long gone I fear, so nothing to poke about in and see.
Bill

Offline Tone

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Re: 12 volt
« Reply #18 on: 10.04. 2009 18:02 »
Thanks Richard, Paul's site is too good I've ordered more than I think I needed. *smile*

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Re: 12 volt
« Reply #19 on: 11.04. 2009 03:00 »
LJ,
    the regulator on the left is a late MCR2, it has the same mechanism as the RB107 & RB108. The one on the right is the early type and is similar to the MCR1.
Both of yours are suitable for a 60W generator. The 40W type has 7 turns of heavy conductor on the regulating bobbin and the 60W has 5.

Fido, your 1948 bike should have had a 40W generator with an MCR1 regulator.
  Trev.

Offline LJ.

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Re: 12 volt
« Reply #20 on: 11.04. 2009 10:44 »
Thanks Trev... That's a helpful reply!

Probably my pictures of the regulators are a bit decieving as the left one looks quite crummy compared to the cleaner right one, making the right one look newer and later. But... the right one does look much more updated and streamlined. It just goes to show that appearances can be quite deceptive.

Thanks again!
Ride Safely Lads! LJ.
**********************
1940 BSA M20 500cc Girder/Rigid- (SOLD)
1947 BSA M21 600cc Girder/Rigid-Green
1949 BSA A7   500cc Girder/Plunger Star Twin-(SOLD)
1953 BSA B33  500cc Teles/Plunger-Maroon
1961 BSA A10  650cc Golden Flash-Blue
1961 BSA A10  650cc Golden Flash-Red

Offline Josh Cox

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Re: 12 volt
« Reply #21 on: 21.06. 2009 14:35 »
Hi all,

Have read the 12 V's 6 volt posts and have a couple of questions.

I am presently restoring a 53 flash and have opted for the DVR to replace the MCR with the SRM toothed belt drive mod.

With some other other Orabanda approved mods:


Presently looking at replacing the underslung pilot and brake/tail with LED, which will use perhaps 1W between them, and a halogen, some here have said they use a 50/65W ( or there abouts ), does this work OK, what about at idle ?.

I understand the power rating of the generator is proportional, for a fixed unit, to field strength and RPM.

A 60W generator will not stop generating at 60.01W, It will keep putting out power until it overheats and breaks down the insulation and burns a winding, but must be at an appropriate RPM to achieve said power output.

So what are the advantages of having the unit rewired for 12 volt ?, is there an advantage if one uses the belt mod ?.
Black 1953 Golden Flash Plunger

Offline MikeN

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Re: 12 volt
« Reply #22 on: 21.06. 2009 20:03 »
My friend and I have both been running our A10's with 12v for the last 3 years
.he uses a tooth belt conversion from SRM .The belt failed after 2000 miles .I think I remember Paul Goff saying this happens.Also, a flange fell off his pulley .I use the Tony Hayward "genration 3" (sounds a bit Star Trek) kit and have not looked at it in 6500 miles.Both these kits raise the gearing slightly.I believe Tony Hayward Now supplies SRM with their kits and you can get them direct from him at a considerably cheaper price .
   We both use "V-reg" solid state Voltage controls from AO services.
  We both agree that not much charging takes place below 30mph and running around town at night drains the battery.
 Hope this is of interest.
Mike

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Re: 12 volt
« Reply #23 on: 21.06. 2009 22:42 »
Josh, if you are not going to be riding at night, why bother converting to 12V?
If you go back in time to an earlier post you can get the comparison between a standard generator and one which I rewound to 12V.
Trev.

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Re: 12 volt
« Reply #24 on: 22.06. 2009 09:00 »

   We both use "V-reg" solid state Voltage controls from AO services.

Isn't the V-reg one of the daft ones that drains the battery when charging isn't taking place?

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Re: 12 volt
« Reply #25 on: 22.06. 2009 10:05 »
One flange fell off my SRM drive pulley too and the centre taper died in days despite being assembled apparently perfectly well. Machined it to take the old steel sprocket-centre with its decent taper and it's fine now, but shouldn't have had to. Belt hasn't broken in a few thousand miles. Maybe I should start to worry. If I had my time again I'd buy elsewhere.

Still on 6v with DVR2 and 35W halogen for my A, works well enough and obviously charges from low revs. No discharge into the field coil at tickover per Triton Thrasher's point. Which is a v good feature of Manormike's widget I think. I certainly prefer over the JG and V-reg jobs I've had (at 12v and 6), which are now in reserve. But I do prefer the better illumination from 12v systems (with DVRs) on other bikes as personally I need lights quite a lot for half the year. Have found the combination of E3L at 6 or 12v with DVR extremely reliable over quite a lot of miles. Hardly ever think of Uncle Joe as the Prince of Darkness any more.
Bill

Offline MikeN

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Re: 12 volt
« Reply #26 on: 22.06. 2009 10:34 »

   We both use "V-reg" solid state Voltage controls from AO services.

Isn't the V-reg one of the daft ones that drains the battery when charging isn't taking place?

No.

Offline Josh Cox

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Re: 12 volt
« Reply #27 on: 22.06. 2009 12:10 »
If pulleys have fallen off the drive end, I'm probably going to regret drilling the outer threads, guess I'll just have to suck it and see.
Black 1953 Golden Flash Plunger

Online RichardL

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Re: 12 volt
« Reply #28 on: 22.06. 2009 13:16 »
Josh,

I'm sorry, please refresh my memory, the helicoiled holes are for a puller?

Richard L.
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Offline Josh Cox

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Re: 12 volt
« Reply #29 on: 22.06. 2009 13:46 »
That's correct, the inner holes fit a small harmonic balance puller, and the outer holes a big one (a little over engineered, I had fun doing it).




Mike, is there any reason I can not pop a rivet in one of the mounting holes, tap it and use it for a earthing point ?,
FYI, SN: 0419.

Trev,
I want to go 12 volt for a number of reasons:
*I already have a 12 volt charger,
*I believe a great number of the engine problems with these bikes are with the Magneto, if this gets under my skin I can go electronic very easily,and,
* Bulbs and batteries are easier to buy.
Black 1953 Golden Flash Plunger