XJ40 ( XJ81 ) 1986 - 1994

aj6 ignition timing curve ?

Old 01-10-2019, 03:53 PM
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Default aj6 ignition timing curve ?

Following on from my twin engined car engine dating fun , i am trying to find out what the stock aj6 ignition timing curve is ,with or without vacumm , i am not fussy .

I am guessing it at around 12 d tickover, plus whatever vacuum advance jag put in there ,and around 28 to 32 d max advance ,again plus vac . if anyone out there knows the actual numbers , that would be very helpful . i am running on lpg , and the way i can create the right curve is to refer to the original ,then modify it .

i know there is an advancing kit one can buy , the amount of advance would be handy to know too ,so i can see what these engines can actually tolerate in the real world .

thank you ,
Old 01-12-2019, 10:07 AM
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I think I found some info for you- the engine management system diagnostic pdf (available for download) says 10d in N at 700rpm and 16d in D at 580 rpm. There is also other info there you may want to see if you don't already have it. Since its ignition is all computer controlled, I think any vacuum advance would be through sensors instead of actual.... Hope that is of some use. Good luck.
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Don B (01-20-2019)
Old 01-12-2019, 02:40 PM
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thanks Jerry , i will have a look for it .
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