Ladies and gentlemen,
After quite a bit of research and development time on the XS and Xj ignition systems, I've come to a few conclusions and want to run them by all of you. Especially those of you who own both an XS and an XJ.
As I do not have access to an XJ, I need some help on testing out my theory:
1. The XS and the XJ share the same Crankshaft (2H7-11411-02-00).
2. The XS and XJ share the same Crankcase (2H7-15100-02-00).
3. The only difference between the two gnition systems is that the XS has a mechanical advance bolted to the end of the crank whereas the XJ has an electronic advance circuit built into the TCI box.
4. I see no reason why the pickup and advance mechanism from the XS would not work on the XJ. You would have to move the vacuum line from the XJ Boost Sensor over to the vacuum canister of the XS advance mechanism to provide mechanical advance instead of electronic advance. . other than that, it should work.
My line of thinking is this. We will probably never find a simple fix for the XJ TCI box because it is much more complicated electronically than the XS. It has proprietary circuitry that would be almost impossible to replicate, never mind repair. The XS TCI, however is a fairly simple design that lends itself to alteration, repair and, if my calculations are correct, duplicatable. (more to come on that project).
Now, of those of you who own both, are any of you up to the task of swapping the XS pickup mechanism into the XJ to test my theory? The worst that could happen is it won't run, then you can swap it back.
In the end, we may just wind up with another option for you XJ owners when your TCI fails. Think about it.
I can't wait to see the feedback on this one.
LOL,
Randy
After quite a bit of research and development time on the XS and Xj ignition systems, I've come to a few conclusions and want to run them by all of you. Especially those of you who own both an XS and an XJ.
As I do not have access to an XJ, I need some help on testing out my theory:
1. The XS and the XJ share the same Crankshaft (2H7-11411-02-00).
2. The XS and XJ share the same Crankcase (2H7-15100-02-00).
3. The only difference between the two gnition systems is that the XS has a mechanical advance bolted to the end of the crank whereas the XJ has an electronic advance circuit built into the TCI box.
4. I see no reason why the pickup and advance mechanism from the XS would not work on the XJ. You would have to move the vacuum line from the XJ Boost Sensor over to the vacuum canister of the XS advance mechanism to provide mechanical advance instead of electronic advance. . other than that, it should work.
My line of thinking is this. We will probably never find a simple fix for the XJ TCI box because it is much more complicated electronically than the XS. It has proprietary circuitry that would be almost impossible to replicate, never mind repair. The XS TCI, however is a fairly simple design that lends itself to alteration, repair and, if my calculations are correct, duplicatable. (more to come on that project).
Now, of those of you who own both, are any of you up to the task of swapping the XS pickup mechanism into the XJ to test my theory? The worst that could happen is it won't run, then you can swap it back.
In the end, we may just wind up with another option for you XJ owners when your TCI fails. Think about it.
I can't wait to see the feedback on this one.
LOL,
Randy
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