Ballast Resistors
Hello everyone,
I’ve just joined the forum and thought I’d say hello. I’m a bit of long-suffering builder (for various reasons) but if I tell you that I’m building a SYLVA striker I guess you’ll know just how long it’s been! I’m just getting back into the build now and about to make a final effort to finish the project. Anyway, if you don’t mind I have a question on ballast resistors and would appreciate your thoughts... Basically, should I include a ballast resistor in my ignition circuit? From the research I’ve done I think that I should be fitting one as I have a 1.5 Ohm coil. But I’m not sure whether it would be just better to fit a 3 ohm coil and leave the resistor out. Am I likely to have starting problems if I go down this route as I understand the ballast resistor (well bypassing it) helps improve the spark for starting? What do people recommend? By the way, the engine is a 1700cc crossflow currently still fitted with points (though I’m planning to fit an Aldon ignitor soon). Cheers, Chris |
Quote:
Robin (Old enough to remember what points look like lol) |
Cheers Robin, I figured it was something like that.
When I originally wired the circuit I did actually wire a resistor in to the circuit but it got very hot (like glowing red hot) whenever the ignition was switched on. I decided this probably wasn't a good idea and so removed it. Subsequently I managed to burn out the carbon bush in the top of the dizzy cap. Now I look back on it, I'm wondering if I managed to wire the ballast resistor in parallel rather than in series with the coil. How hot do ballast resistors normally get? It was made of a ceramic material so I guess its deigned to take some heat?? Chris |
Hi Chris
I can't remember what resistance a typical ballast resistor is now - but yes - they can get hot. I seem to remember the one I used was quite large (like about 5 cm long) and it had a mounting plate that you bolted to something to help dissipate the heat. Mind you that was 20+ years ago and my recollection is a bit vague now! Robin |
Cheers Robin. Yeah the resistor I have is a similar size - I just thought that it was strange that it should be so hot all of the time. Anyway, I guess I should re-introduce it to the circuit. Thanks again...
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