Board logo

Will a engine start without Ballast resistor?
speedyxjs - 12/9/09 at 08:20 PM

As above, trying to save every bit of money i can at the moment but if i need one i will get one.


big_wasa - 12/9/09 at 08:23 PM

Start yes but if the coil needs one you will cook the coil running it for long.

I thought your new one was electronic ignition ?


speedyxjs - 12/9/09 at 08:25 PM

So did i but it seems it just had more boxes to control the fueling.

Im not too bothered, i prefer the old fashioned points.

How long do you think it will be ok for as it hasnt got any cooling system atm so cant run it for too long anyway.


BenB - 12/9/09 at 08:29 PM

It'll start okay but as said it'll burn out once it's running. The ballast resistor drops the voltage to a common trick to help starting was to bypass the ballast resistor with a relay activated by the starter. This increased the voltage at the coil to improve the spark during cranking when the voltage across the battery is a fair bit lower than when the alternator is working....
Though to be fair it depends on the coil and whether it's designed to run with a ballast resistor....


speedyxjs - 12/9/09 at 08:37 PM

Correction - After some quick research, it has an ignition amplifier module.

I assume this acts as the ballast resistor as the wiring diagram i have just looked at (although froma different car) has the ignition amplifier module power the coil.

Aaah this is confusing!


MakeEverything - 12/9/09 at 08:37 PM

It will burn out in a matter of minutes.

For the sake of £12 for a ballast resistor, i really wouldnt bother trying anything else.


rusty nuts - 14/9/09 at 07:10 PM

The coil will probably not burn out but the condensor will in a couple of hundred miles at the most.