Bela,
I suggest you try to achieve the following depending on condition of your Lucas Distributor . (At 70 years old it is doubtful it is working correctly .
Even new they were not top quality items .)
The advance curve I have used on many different Bristol engines is
Static 12 deg BTDC
3000 rpm 36
5000 rpm 43
Is your TDC mark accurate ?
I have an new old stock original Lucas cap if you are interested, but recommend you check if the distributor bob weight system and springs are working correctly before you spend money on any Lucas Distributor .
What type of plug leads do you have ? I only use wire leads .
Geoff
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