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Lighting and Electrical Things that go ZOT! Ignition components, batteries, lighting and accessories

View Poll Results: Are You Going to Roll Your Own CDI?
No, too complicated and difficult. 24 28.24%
Yes, but only one, for my own MB. 23 27.06%
Yes, a few for my own use. 30 35.29%
Yes, many, I'm gonna sell 'em! 8 9.41%
Voters: 85. You may not vote on this poll

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  #291  
Old 10-01-2011, 08:31 PM
kusanagy100 kusanagy100 is offline
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Default Re: Roll Your Own CDI

no need some series resistor in each sides of pontentiometer?

and witch efect produces the 47 ohm and 560 ohm resistors in the retard curve?
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  #292  
Old 10-01-2011, 08:32 PM
kusanagy100 kusanagy100 is offline
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Default Re: Roll Your Own CDI

no need some series resistor in each sides of pontentiometer?

and witch efect produces the 47 ohm and 560 ohm resistors in the retard curve?

wath model of scr is used? tic 106d? bd 140?
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  #293  
Old 10-01-2011, 11:32 PM
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Ratchetbirds Ratchetbirds is offline
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Default Re: Roll Your Own CDI

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Originally Posted by rohmell View Post
Yes! This way you can be proud to use a CDI that you built yourself!
Yes, the feeling of putting it on and having it work very well is indescribable.

So a new thought, Rohmell. Ever hand wind your own magneto? I am heavily contemplating it right now. Have tracked down wire, have access to lathes, but I can do it without one. Was wondering your thoughts on wire size and windings. My Grubee manual said it had 4000 winds of fine wire on top and 390 turns of heavier on the bottom. Of course the fine wire is ignition, thick wire for the 6vdc output. The new windings I wish to apply are for ignition only. The original fine wire appears to be 34 gauge(.0063). I can get that size in a 2000 foot roll for about $15. And this IS magnet wire, insulated and all that.
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  #294  
Old 10-01-2011, 11:56 PM
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GearNut GearNut is offline
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Default Re: Roll Your Own CDI

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Originally Posted by Ratchetbirds View Post
Yes, the feeling of putting it on and having it work very well is indescribable.

So a new thought, Rohmell. Ever hand wind your own magneto? I am heavily contemplating it right now. Have tracked down wire, have access to lathes, but I can do it without one. Was wondering your thoughts on wire size and windings. My Grubee manual said it had 4000 winds of fine wire on top and 390 turns of heavier on the bottom. Of course the fine wire is ignition, thick wire for the 6vdc output. The new windings I wish to apply are for ignition only. The original fine wire appears to be 34 gauge(.0063). I can get that size in a 2000 foot roll for about $15. And this IS magnet wire, insulated and all that.
Ever read this thread?
http://motorbicycling.com/f39/windin...ire-14619.html
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  #295  
Old 10-02-2011, 12:06 AM
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decoherence decoherence is offline
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Default Re: Roll Your Own CDI

Quote:
Originally Posted by Ratchetbirds View Post
So a new thought, Rohmell. Ever hand wind your own magneto? I am heavily contemplating it right now. Have tracked down wire, have access to lathes, but I can do it without one. Was wondering your thoughts on wire size and windings. My Grubee manual said it had 4000 winds of fine wire on top and 390 turns of heavier on the bottom. Of course the fine wire is ignition, thick wire for the 6vdc output. The new windings I wish to apply are for ignition only. The original fine wire appears to be 34 gauge(.0063). I can get that size in a 2000 foot roll for about $15. And this IS magnet wire, insulated and all that.
there is a motor rewinding place down the road from me..
i also have a spare mag coil that is fried.
i was thinking about having them rewind it w/o the an "accessory" winding.
as long as it isn't too expensive.
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  #296  
Old 10-02-2011, 08:32 AM
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rohmell rohmell is offline
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Default Re: Roll Your Own CDI

Quote:
Originally Posted by kusanagy100 View Post
no need some series resistor in each sides of pontentiometer?

and witch efect produces the 47 ohm and 560 ohm resistors in the retard curve?
No need series resistors. The gate can be at either gnd or else SCR's cathode potential.

47 and 560 ohm and capacitor are a starting point for experimentation. curves will be different due to SCR DV/DT , triggering points and ignition coil winding impedance/reactance/inductance.
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  #297  
Old 10-02-2011, 08:35 AM
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rohmell rohmell is offline
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Default Re: Roll Your Own CDI

It would be interesting to wind your own magneto, and possibly maybe even your own ignition coil.
Someone could offer those parts as an upgrade to the stock magneto and CDI.

I don't think I would have the patience to sit and wind 4000 turns of hair-thin magnet wire onto a form. I think in five minutes of doing so, coils and forms, etc would be flying up in the air.
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  #298  
Old 10-02-2011, 10:29 AM
impression impression is offline
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Default Re: Roll Your Own CDI

Quote:
Originally Posted by rohmell View Post
It would be interesting to wind your own magneto, and possibly maybe even your own ignition coil.
Someone could offer those parts as an upgrade to the stock magneto and CDI.

I don't think I would have the patience to sit and wind 4000 turns of hair-thin magnet wire onto a form. I think in five minutes of doing so, coils and forms, etc would be flying up in the air.
haha yeah. I thought about making my own Ignition coil that would be good for 20,000v ( enough to create a good spark with the worst of spark plugs and weakest of stator as well as under 200 PSI compression)

my issue is that now i'm running the coil on the right ( orange top) and it generates more than 20k ( used a multimeter )


It's also oil filled as to keep the windings inside it cool and is completely sealed. Honestly i couldn't justify buying the parts and making my own when i got the above 2 coils at a buy 1 get 1 free bargain

what i want to do next is wind my own magneto (stator)



i'm still working on how many turns to give me 4.8v on the white wire @ 2000 rpm. THis is so lights ( led's ) will still run @ idle, yet won't create too much voltage as to blow everything when you rev the engine flat out.
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  #299  
Old 10-02-2011, 10:44 AM
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Ratchetbirds Ratchetbirds is offline
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Default Re: Roll Your Own CDI

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Originally Posted by GearNut View Post
Hiya Gearnut,

Yes I read Norms work on rewinding and it has important info I will need to rewind my magneto, but everyone else's work is for trying to get better lighting from the white wire coil without dropping out the ignition. I could care less about the 6 volt circuit, I just want improved ignition...bigger, hotter spark. Ya know, more power <G>. So I guess I will be doing some research on a single coil magneto. Norm is an impressive individual with skills that seem to know no bounds. We are all lucky he shares with us. Him and many many others.
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  #300  
Old 10-02-2011, 07:23 PM
impression impression is offline
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Default Re: Roll Your Own CDI

Quote:
Originally Posted by Ratchetbirds View Post
Hiya Gearnut,

Yes I read Norms work on rewinding and it has important info I will need to rewind my magneto, but everyone else's work is for trying to get better lighting from the white wire coil without dropping out the ignition. I could care less about the 6 volt circuit, I just want improved ignition...bigger, hotter spark. Ya know, more power <G>. So I guess I will be doing some research on a single coil magneto. Norm is an impressive individual with skills that seem to know no bounds. We are all lucky he shares with us. Him and many many others.
That's easy.

Since you don't want to make the "white wire" do 3500 turns of 30 gauge wire instead of 3100 turns of 36 gauge...

the higher gauge wire will let you do more 'turns' and keep the same level of resistance, yet his way you will generate more voltage = stronger spark

I can do the math for you, but i'm just about to face-plant my keyboard. G'night all
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