Austin Branson Posted May 6, 2018 Report Share Posted May 6, 2018 Greetings, Oh Sage Ones, it's a 1974 CF, running an Eaton supercharger, and an SU HD8 carburetor. Ignition is all Distributor Doctor, cap, leads, rotor, coil (ballast resistor type). I suspect the ballast wire. I snipped off the female spade connector on the two wires to the coil, and replaced it. As a result the misfits was greatly improved, but still there. Can anyone tell me if a better way of supplying the lower voltage (I assume six volts?) exists? Many thanks, Austin Quote Link to post Share on other sites
TriumphV8 Posted May 6, 2018 Report Share Posted May 6, 2018 I would go for a CDI ignition like MSD6 or ACCELL. I have both in use on my two TR6 because ignition ex works is at the limit and over the years it might drop below the limit. A first remedy can be to use spark plugs with no resistance built in and with a smaller center electrode like the iridium plugs. They also have a smaller gap like 0.6mm If there is more pressure in the combustion chamber like from a supercharger the spark "sees" a bigger resistance and refuses to jump over from time to time. Quote Link to post Share on other sites
Mike C Posted May 6, 2018 Report Share Posted May 6, 2018 I still use the original ceramic ballast resistor: http://www.angclassiccarparts.co.uk/home/triumph-5981/tr6/ignition/ballast-resistor-16-ohm-tr6 Quote Link to post Share on other sites
Austin Branson Posted May 7, 2018 Author Report Share Posted May 7, 2018 I still use the original ceramic ballast resistor: http://www.angclassiccarparts.co.uk/home/triumph-5981/tr6/ignition/ballast-resistor-16-ohm-tr6 Quote Link to post Share on other sites
Austin Branson Posted May 7, 2018 Author Report Share Posted May 7, 2018 I still use the original ceramic ballast resistor: http://www.angclassiccarparts.co.uk/home/triumph-5981/tr6/ignition/ballast-resistor-16-ohm-tr6 Quote Link to post Share on other sites
Austin Branson Posted May 7, 2018 Author Report Share Posted May 7, 2018 Hello Mike, please forgive my stupidity - I have never seen one of these on my car. My reading of the workshop manual led me to believe that the voltage was reduced by the use of a resistance wire. Where will I find this on my car? Or do I need to re-wire, by-passing the original wire, and using the ceramic ballast resistor? Austin Quote Link to post Share on other sites
stuart Posted May 7, 2018 Report Share Posted May 7, 2018 Hello Mike, please forgive my stupidity - I have never seen one of these on my car. My reading of the workshop manual led me to believe that the voltage was reduced by the use of a resistance wire. Where will I find this on my car? Or do I need to re-wire, by-passing the original wire, and using the ceramic ballast resistor? Austin Thats an aftermarket part as fitted to early series one Jaguar XJ6 and others of that era but not TR6 as they used a ballast wire in the loom. Stuart Quote Link to post Share on other sites
Mike C Posted May 7, 2018 Report Share Posted May 7, 2018 I thought it was original- it was installed on my 1969 CP when I bought it 20 years ago and looked old then. It's often sold as a TR6 part. Mine's mounted on the horizontal section of firewall behind the wiper bottle. I'd wire the ceramic resistor in place of the resistor wire.--so that 12V is fed direct to the coil when the starter is energised and once the engine starts and the key is released the coil feed reverts to feeding through the ballast resistor. Without seeing your wiring , I'd guess I'd mount it in a suitable location and connect the ends of the ceramic resistor to the same points as the old ballast wire but using copper wire. Quote Link to post Share on other sites
HarveyCoppock Posted September 11, 2018 Report Share Posted September 11, 2018 Saloons have ceramic ballast resistor, maybe the 69 TR has had a 6V coil and ceramic ballast resistor fitted as a mod. Quote Link to post Share on other sites
Tim D. Posted September 12, 2018 Report Share Posted September 12, 2018 Austin, what boost are you running? I have the eaton/holley setup and am running 4psi.. For ignition I use a standard distributor running through an Aldon Amethyst (to allow me to use boost retard if I need it). Mines a CP so no ballast, but despite this starts better than any classic I have ever had (e.g. First turn of the starter). tim Quote Link to post Share on other sites
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