Fitting an AccuSpark

After the failings of several condensers, I picked up a little AccuSpark unit at the Classic Car Show at the NEC. I finally got around to fitting it and it turned out to be pretty easy.

The unit replaces both the points and the condenser, hopefully making for little or no maintenance issues behind the dizzy cap. The little kit cost around £30 and comes with the base-plate with sensor attached, a trigger ring with integral rotor arm, a separate trigger ring to let you re-use your existing rotor arm, all the wiring ready to go and a little sachet of silicon paste to apply to the bottom of the unit before installing.

Fitting the unit is straightforward, I have a ballast coil which AccuSpark recommends you test to make sure has a resistance of no less than 1.4 Ohms. I checked mine and it read 1.5, so I could do the 'easy fit'! I did have to remove one wire from the coil on the + side to make room for the extra wire (the red one) coming from the dizzy. This was a coil radio suppressor which stops radio interference; I'll live without it for a while and see if it makes any difference not having that - they apparently didn't work so well anyway. The other wire (black) from the unit takes the place of the old black wire to the neg. side of the coil. The earth cable inside the dizzy is simply reattached in the same place it was before (I say simply, but if you've tried working on a B's dizzy in-place you know it isn't simple!).

I threw my old points, condenser, rotor and base-plate into the boot as emergency spares as they don't take up any room.

First fire-up seemed to have quite a difference. It started up easier and needed less choke, so that appears to be a good start. Next proper run will test this out for sure.

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  1. Christian said on 15 May 2011:

    Yesterday I built an AccuSpark unit in my B as well. But I am wondering where to use the little O-ring (rubber, on the top right corner of your pic). Any ideas?
  2. Adam said on 15 May 2011:

    Hi Christian - that is the same as the ring on the base of the supplied rotor arm. It means you can either use their supplied rotor, or if you want use your existing one and put that ring around its base to supply the pickup for the sensor. It sounds like you've used the supplied rotor, so you will have the ring left over. Hope that helps!
  3. Christian said on 15 May 2011:

    many thanks!
  4. Steven said on 1 Dec 2011:

    I got exact same kit from Powerspark at the thing looks exactly the same so I guess it is. paid £25.99 for mine
  5. eric said on 28 Aug 2012:

    I have just fitted new kit from accuspark and a new coil, to a 1950 Jowett Javelin. Had a run over the weekend of 372 miles. Ran like a dream. Very pleased
  6. dennis said on 24 Dec 2012:

    hi my name is dennis have 1979 mgb fitted my accuspark same way as you but it did not work help help thanks
  7. Adam said on 7 Jan 2013:

    Hi Dennis - was it running ok on points before you fitted the Accuspark? If it was then the main thing will be checking the wires and the important earth cord are all connected fine. If not then it could be unrelated - check you're getting spark at the plugs, and fuel is getting through.
  8. keith said on 17 Mar 2013:

    I have just fitted the acuspark to my yella mgbgt, and it is working pretty good.I have removed an old electronic system , and i don,t have an earthing wire inside the dizzy to reconnect. Is this right.
  9. Adam said on 17 Mar 2013:

    Keith - I definitely had an earth wire on mine, but as you were replacing an existing system there might be an earth elsewhere. If it's working fine, sounds like you're ok!
  10. paul bush said on 12 May 2014:

    I have converted several Morris minors over to neg earth, never had any problems until i came across a car with this unit in! (wasted cost), shame they don't have a polarity 'gate'.