DX6A Distributor advance curve - 401

[Julian Caples]

Hi John

Here's a starting point
Static timing set to 8 degrees BTDC (Crank)
Initial advance starts at 1000 RPM
16 degrees at 2000 RPM (Crank)
26 degrees at 3000 RPM (Crank)

aim for a total advance of 34 degrees (26 plus the original 8)
some engines do better with a bit less static (say 6 degrees) some with a bit more (up to 10) anything more than 10 is excessive

the Bristol 'I' knob only retards the ignition - it was designed for use with post-war pool petrol and other dubious fuels in europe (ie to compensate for really bad fuel) my advice is disconnect it - it only leads to trouble (because people want to play with it)
a vacuum advance will not replace the 'I' control - it should only provide additional advance under partial load conditions
be very careful with a partial load advance feature the engines are sensitive to over advance and you can burn out pistons quickly

what ECU/programmable unit are you using?

regards

Julian