Dynamo vs alternator

I have been searching for the same for my DB2 Aston. There is a company in UK and in USA that offer these alternators that look like dynamo but as you say they are very expensive.....I will watch this thread to see if anyone has a better, (and cheaper) alternative.

 

http://www.brise.co.uk/documents/BRI0069335RH.pdf

Demon Tweeks sells them.

http://www.demon-tweeks.co.uk/products/ProductDetail.asp?cls=MSPORT&pcode=BRI006

 

Just a random question, but is this a 6V system?

If so, do they possibly make one of those temp booster start packs that works (can be set to) 6V? It would be easier to clip on than changing the whole battery.

 

002 is 12V so this likely is as well. A number of the MM cars run two batteries with a switching system.

A HO alternator will end this issue. You do have to be carefull with your amp. gauge if you use a Very HO one. You have to run the gauge differently or you will fry it.

The Brise system at 35 amps may be ok but a Bosch HO at 170 amps won't be.

 

Oscar,

Think of the equivalent situation with the cooling system: If a cooling system is beginning to deteriorate, it will still keep the engine cool while driving but will insufficient in traffic.

Unless these problems are happening at night, I have my doubts that everything is working correctly with your charging system. I suspect a minor component associated with the charging system is failing; I don't recall if they had diodes or something equivalent, but a weak or lossy device would explain the system's poor performance.

If you are certain that everything works correctly, I have a second suggestion. Do you run the car to red-line regularly? If not, a simple solution would be a slightly smaller pulley on the dynamo - this will make it spin faster for a given engine speed, thus solving your problem.

Regards,

Art S.

 

http://www.powermastermotorsports.com/powergen.html

$ 300-400 USD at jeggs

 

In some cases the replacement voltage regulators are set for low amps. For so many people it is enough that it seems to work ok...

Ferraris used to have big generators; my GTE has a 400 watt generator and if the 30 amp regulator is replaced with a typical 20 amp regulator, the output drops down to 250 watts just like that. If you put in a 15 amp regulator, you fall below 200 watts. Lights alone may use all that.

If you are running many appliances, the generator can't handle the job. 400 watts is only so much. Does you generator have a rating stamped on it? Mine says Marelli DN63B-400/12-2300S. That means tipo DN63B, 400 watts at 12 volts (nominal) when run 2300 RPM to the left (sinistra) i.e. pulley runs CCW.

 

In black that looks very good and is reasonably priced.

Art

At night in a car with a generator especially an 50ies era one you're running off the battery much of the time. Wipers, lights, cooling fan, and stop and go and you're SOL.

Best

 

Oscar

Have you spoken to Sport Auto in Modena? They can help you. Tell them the guy with 002 sent you. I'd be careful here as the direct drive isn't something you want to over stress.

Cheers!

Best

 

It may also be as simple as servicing the voltage regulator. The Lucas dynamos of the same era, like fitted to my Healey, need to have the air gaps of the spools tested and adjusted, if required. This function "regulates" the current and voltage being supplied to maintain a charged battery.

I'm not familiar with specific Magneti-Marelli service protocol, but 50s technology is 50s technology.

Maybe you don't need anything more than a service bulletin that describes the procedure, and some patience to carry it out?

 

Thanks for this decoding of the Marelli stamping. It should have been obvious to me but wasn't! It will help no end when looking out for spares...
Will

 

Hi Will,

Few minds wear out; more rust out. (Joke)

You need for you Vingale project the smaller and much lighter DN 51 beltdriven Alt.
DN 63 was used on later PF and GTE , But not on the racecars like( SWB GTO) they also used the much lighter 3.5 kilo 300Watt producing alternator.
ciao
C.
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Will,

Irritation The diff. in weight between DN 63 and DN 51 is 3.5 kilo sorry.

Cornelis

 

Oscar,
I would keep everything original.
and buy a Battterie of let say 250 Amp,
if you have enough space under the hood to place this huge one.
that will be enough , and reload this over night at the hotel.
by a supplement charger.
This will cost max 400 euros

ciao
C.

 

You might also check the rating on your voltage regulator. For 150 watts it should read something in range 11-12.5 amps - maybe even "cont. 11A, max 12,5A" or something like that. Some similar looking regulators of the day were rated for less than 100 watts as Fiat 600 could do with 80 watts or so.

Installing TOO BIG regulator will overheat and finally fry the generator, so don't go that way. With little overload the contacts will just wear out quickly as all power is created in the rotating armature and must be transferred to the outside world.

One thing that has also changed, are the batteries. Old batteries gave out much lower max amps, so on high power consumtion the lights would dim out and save energy as the battery simply could not deliver what was being asked for. Today the batteries are designed to start a truck in minus 35 degrees, so they will happily spend all their charge just like that!

 

Oscar,
If you buy this high power Alternator alternative, the force on the distrubutionchain will be much higher ,and cost a lot of HP on the already weak preformance of a 212 engine.
Since when is 220V not available in the hotelparking ????

ciao
C.

 

Very good!

Actually I need a direct drive type to go on the Boano engine, but may well make up a light casing and build an alternator inside. Adapting a belt drive would look all wrong. I can't see it should be that difficult or expensive but haven't looked into it yet.
W

 

Oscar, I am looking for a dynamo Magneti -Marelli DN2A, for my 195 inter SN 0117S , If you found an alternator I could be interested to buy your old dynamo !
Guy

 

You know, it's a bit of a stretch, but some of the hot-rod guys have mounted alternators adjacent to the rear axle, and sandwich a pulley between the driveshaft and pinion flange to drive them. A small one-wire Delco Alternator could be wired into the main charging circuit (protecting your existing equipment with appropriate sized diodes) for some supplemental charging. This would be completely out of view, unless the vehicle was inspected on a hoist.

Naturally, this would be of little use while at a standstill, but could be beneficial while traversing mountain passes at night, in the rain. You may also find that keeping the battery up to a full state of charge while underway will get you through those periods of stop 'n go traffic.

My first recommendation, as I posted earlier, is to make sure that the equipment you have is operating as it should.