Hi, I’m hoping you can help me. I am an ex member of the club and I am now restoring a mk1 Sprite. The car runs on unleaded and has not been modified to accept this fuel. It has an inline additive system.
It runs very rich and I have been told that in order to cure this problem I have to alter the timing to allow for the lower octane fuel. I have been told that I should advance the timing to compensate, but also that I should retard the timing to sort this problem.
Can you confirm which I should do and how many degrees (advance or retard) in relation to top dead centre.