How many degrees advance - change in RON

[planetdave]

Right then.......my cologne engined Capri hasn't been tuned since leaded petrol was de rigeur.

I consulted my Haynes and they have it as wanting 12* BTDC.

Now IIRC leaded was 98RON.

I want to run 95.

So I've found a strobe and chalked it up and had a little google.........

which took me to an Integra tuning site that advocated advancing until it pinked at idle and then backing off 2*.

I haven't gone that far but I have left it at 15*.

What does the house think the correct angle is, is the 2* thing correct and any other tips/hints for something that can be done with a strobe, some dodgy spanners and an old stick. All in language that a complete dumbass like me can understand.

I thank you

[planetdave]

It's a mechanical injection and I don't think there is scope for changing the mixture.

It's also a Capri........the ancils are simple and the only loads you can apply are the heater fan/wipers/lights and demister.

I think I'm stuck with playing with the advance. Unless you have some cunning (and simple) plan.

[planetdave]

I thought lower octane = slower flame front = more advance.

I haven't gone the wrong way, have I?

and now I've got the strobe and marked the pulley it's only a couple of minutes work to rectify

[planetdave]

Right - I think you've penetrated my thick skull at last.

Thanks muchly

[planetdave]

The poor OP doesn't have an ion detector and is beginning to regret opening this can of worms.

When you guys have reached a concensus will you let me know?