Ignition dilemma

[Bitsa (Ralph Wright - RIP)]

Did you cry once a year Bryan?
Cheers
Bitsa

[JustcallmeMrT]

I've been reading along here and trying to get my head around the electrics.  My coils are done and need to be replaced, so was considering a set of dyna coils - would these stronger coils impact the standard points system?  Does more current then run through the points, thus making the Hondaman setup a good idea?
Nothing like reading a few threads to feel ignorant again!  ☺

[Norniron]

I've been reading along here and trying to get my head around the electrics.  My coils are done and need to be replaced, so was considering a set of dyna coils - would these stronger coils impact the standard points system?  Does more current then run through the points, thus making the Hondaman setup a good idea?
Nothing like reading a few threads to feel ignorant again!  ☺

[Trigger]

I've been reading along here and trying to get my head around the electrics.  My coils are done and need to be replaced, so was considering a set of dyna coils - would these stronger coils impact the standard points system?  Does more current then run through the points, thus making the Hondaman setup a good idea?
Nothing like reading a few threads to feel ignorant again!  ☺

Is this the statement that Hondaman wrote 

[JustcallmeMrT]

So out of my depth! 

[Bryanj]

No Bitsa, as you well know after a 13 hour night shift my keyboard is dyslexic

[Bitsa (Ralph Wright - RIP)]

 
Bitsa

[SteveD CB500K0]

Is this the statement that Hondaman wrote 

Can't be.

The whole point about high performance coils is that they offer a lower impedence and hence generate a higher current when active. The voltage in the secondary (HT leads in this case) is a function of the rate of change of the current (not the level of current itself).
When the points open, the current in the coils falls at a huge rate (1000's of Amps per second) and the large HT voltage is generated in the secondary.
Cutting the current back down to standard won't give you a fatter spark unless the secondary has more copper turns.

When the points are closed, the higher current flows through the coil. It doesn't generate anything at that stage - just burns power!

Steve (BSc Eng University of Sussex 1976-79)

I could do the differential calculus back then...

[Nurse Julie]

Oh my goodness. Electrics in the human body are soooooooo much simpler. Either they work or they don't !!!
Julie
MSc BSc(Hons) RGN

[AshimotoK0]

One day I am going to reproduce a modern version of the CDI I designed and  made for my original 400/4 back in 1978 (whacked the standard coils with 400VDC switched by a thyristor from a capacitor (the cappy was a spare  from my Pye valve colour TV at the time!). Retained original points (Honda Genuine) never needed re-timing and did 22k miles before I sold it. Bike was last taxed in 2013 .... wonder if my CDI system is still fitted ... XDN128R. During initial testing the bike backfired and  almost blew my garage door off.

Ash

[mike the bike]

Don't remind me about differential calculus!

Anyway, I fitted a dyna system as well as Dyna coils a few years back.  It now pulls like a train going up hill.  The new coils are also rain proof - the OEM ones used to suffer from getting wet, despite all the sealant.
What I like about the Dyna is there's no extra box of electronics to wire in; it's all on the points plate.  I had to add an extra lead to supply 12v to the points plate but that was it.

[Norniron]

Is this the statement that Hondaman wrote 

Can't be.

The whole point about high performance coils is that they offer a lower impedence and hence generate a higher current when active. The voltage in the secondary (HT leads in this case) is a function of the rate of change of the current (not the level of current itself).
When the points open, the current in the coils falls at a huge rate (1000's of Amps per second) and the large HT voltage is generated in the secondary.
Cutting the current back down to standard won't give you a fatter spark unless the secondary has more copper turns.

When the points are closed, the higher current flows through the coil. It doesn't generate anything at that stage - just burns power!

Steve (BSc Eng University of Sussex 1976-79)

I could do the differential calculus back then...

I copied it from his sohc shop page so i presume it is

[Trigger]

Is this the statement that Hondaman wrote 

Can't be.

The whole point about high performance coils is that they offer a lower impedence and hence generate a higher current when active. The voltage in the secondary (HT leads in this case) is a function of the rate of change of the current (not the level of current itself).
When the points open, the current in the coils falls at a huge rate (1000's of Amps per second) and the large HT voltage is generated in the secondary.
Cutting the current back down to standard won't give you a fatter spark unless the secondary has more copper turns.

When the points are closed, the higher current flows through the coil. It doesn't generate anything at that stage - just burns power!

Steve (BSc Eng University of Sussex 1976-79)

I could do the differential calculus back then...

I copied it from his sohc shop page so i presume it is

 

[bomber]

I'm so, glad there is someone who struggling with understanding it too.
I thought the answer is simply pay another 99 to DS for electronic ignition... how wrong I was.

Still since I don't have 99 so I have to use original ignition, and it seems it is not a bad idea after all!

[Norniron]

I'm so, glad there is someone who struggling with understanding it too.
I thought the answer is simply pay another 99 to DS for electronic ignition... how wrong I was.

Still since I don't have 99 so I have to use original ignition, and it seems it is not a bad idea after all!

I bought one from ds for the 400.i had to send it back,really really bad quality.
It was worth paying an extra £25 for the dyna s