SOHC.co.uk Forums > Project Board
400/4 build. Paused due to other commitments. But starting up again
McCabe-Thiele (Ted):
Are the bolt centres as per the originals if they are I would probably keep them?
The Dynas are probably not worth paying the extra for imho.
That's the same firm I bought my complete Dyna electronic ignition from. As regards current use I thought that is down to the Dyna Electronics not the coils themselves.
ComfySofa:
Still at the office so not sure yet...! i will get back with an answer..!
SteveD CB500K0:
--- Quote from: McCabe-Thiele (Ted) on September 13, 2023, 04:49:26 PM ---
As regards current use I thought that is down to the Dyna Electronics not the coils themselves.
--- End quote ---
The issue is with the primary impedance Ted.
The standard coils are about 5 ohms, which at 12V is 2.4A or 29W when the points are closed.
3 ohm coils will draw 4A (48W) which could easily overload your alternator if you have lights on etc.
I’m writing this from memory so any errors will sin be reported by the (other) electronic engineers on here.
Sent from my iPhone using Tapatalk
K2-K6:
You could open the points gap to wider than std in facilitating running the 3.0 Ohm coils.
Essentially the same that electronic switching does, they can then use less dwell time to reduce the draw and still make good sparks.
One way of almagamating the two different speciation elements.
McCabe-Thiele (Ted):
--- Quote from: SteveD CB500K0 on September 13, 2023, 05:07:46 PM ---
--- Quote from: McCabe-Thiele (Ted) on September 13, 2023, 04:49:26 PM ---
As regards current use I thought that is down to the Dyna Electronics not the coils themselves.
--- End quote ---
The issue is with the primary impedance Ted.
The standard coils are about 5 ohms, which at 12V is 2.4A or 29W when the points are closed.
3 ohm coils will draw 4A (48W) which could easily overload your alternator if you have lights on etc.
I’m writing this from memory so any errors will sin be reported by the (other) electronic engineers on here.
Sent from my iPhone using Tapatalk
--- End quote ---
No worries for me then it's unlikely I will ever ride in the dark again plus my headlamp & rear lamps are LED's.
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