Brighter headlight bulb?

[jensen]

magneto's :

I have the following rotors :

One low output rotor, it says CB72(L), p/n 31101 268 810
Two normal output rotors, it says just CB72, but the strength of fields differ a lot, p/n 31101 268 004 and p/n 31101 268 010

The installed rotor on my CB72 says CB72, but has a higher magnetic strength.

Furthermore I have one rotor with C72 (L) and has p/n 31100 262 000, so I guess a low output for a C72, But I wasn't aware of the fact that for the C72 where also low output rotors made, I also have one rotor wich says C77(S) p/n 31102 266 004, the strenght of that one is much higer than the C72(L), and almost as strong as the one bolted on my CB72, wich has the p/n 31100 268 020, and came compleet as an altenator assy. in a box with 31100 268 020 CYB

There are no marks on the rotor as far I can see other than CB72

These rotors are all NOS, I will go through my used rotors to compare, but that can take a while (there not situated home).

Jensen

[jensen]

I have two aftermarket headlight reflectors,

brand Hella and brand Citzen (ZEF), both H4. I also happen to have a aftermarket standard reflector 35 / 35 Watt, brand unknown.

Pictures on http://www.flickr.com/photos/40215250@N04/3785771120 for Hella
and http://www.flickr.com/photos/40215250@N04/3784963661 for Zitzen or ZEV

Original box of Zitzen (SEV) : http://www.flickr.com/photos/40215250@N04/3785774432/

[vfred]

zeg jensen

waarmee meet jij de veld sterkte van de rotormagneet?

hee jensen

whit what do you messure the flux strength of the rotor?

fred.nl

magneto's :

I have the following rotors :

One low output rotor, it says CB72(L), p/n 31101 268 810
Two normal output rotors, it says just CB72, but the strength of fields differ a lot, p/n 31101 268 004 and p/n 31101 268 010

The installed rotor on my CB72 says CB72, but has a higher magnetic strength.

Furthermore I have one rotor with C72 (L) and has p/n 31100 262 000, so I guess a low output for a C72, But I wasn't aware of the fact that for the C72 where also low output rotors made, I also have one rotor wich says C77(S) p/n 31102 266 004, the strenght of that one is much higer than the C72(L), and almost as strong as the one bolted on my CB72, wich has the p/n 31100 268 020, and came compleet as an altenator assy. in a box with 31100 268 020 CYB

There are no marks on the rotor as far I can see other than CB72

These rotors are all NOS, I will go through my used rotors to compare, but that can take a while (there not situated home).

Jensen

[jensen]

Hoi Fred,

I'm not MEASURING anything here, I COMPARE, so it's a relative observation and not a absolute measurment. I have more than one rotor, so I'm able to compare.

There are many ways to compare the strength of a magnet, I used an old fashioned compass as a measurement tool for comparing the rotormagnets relative.

Just put a compas on your table and slowly push the rotor with a fixed point toward the compass until it's changes direction. The difference in distance between rotors toward the kompass, with the same influance says something about it's strenght compared with others.

but If you're into absolute measurements, this is a relative cheap tool :

http://www.products4engineers.nl/instru ... p-100.html

Jensen

[e3steve]

Great info on the rotors' p/nºs, Jensen. Oddly enough, the low-o/p 31101 268 810 is the most expensive at US$384. cmsnl.com have them in stock, priced to clear at €125! Your highest strength rotor, 31100 268 020 is OOS. I (we) would be most interested in the p/nº of the one on your CB72, when you can. And that's an ingenious, if simple, method of measuring flux!

Your Stanley beam unit is the same as mine and employs the Bosch BA20d lamp.

Thanks for all your info here, Jensen; it's what the forum is all about and helps everybody. Nice one!!

[e3steve]

I'm giving up on the K75 stator idea for now; the BMW (Bosch / Hella) alternator for said bike is a one-piece device and would need to be broken apart and experimented with. Also, it utilises an electromagnetic rotor, as does a modern automotive alternator, where the output regulation is achieved by switching or attenuating the excitation voltage applied to the rotor, thus changing the density of the flux produced by the rotor. Not suitable for our applications, but I'll keep trying to find the relevant info.

At US$225 the Rick's Motor Sport stator kit is definitely getting a bit like an ugly chic after a few beers......☺

[jensen]

Hi steve,

810 = racing = expensive, no matter what it does.
Are you buing from CMS a lot ?

Over the years I boght a lot on ebay, for substantional lower prices.
It takes some time, but you will get it.

succes with your dynamo / genarator, and thanks for all the info about bulbs ,

I the maintime I will exepriment with a voltage regulator attached to a experimel setup of a original rotor / dynamo conficuration. It should be possible, from my point of view there are no issues what it should not work.

Jensen