Morris Minor Owners Club

Could anyone recommend the number of degrees ‘all-in’ advance and appropriate revs for setting the ignition timing on a 1275 Marina engine?

I understand that checking ignition timing ‘all-in’ at about 3,000rpm is more accurate than checking at idle speeds. However, the workshop manual doesn’t list figures for this.

My engine is fitted with a Kent 266 cam, higher compression ported head, HIF44 with K&N filter, plus Janspeed exhaust headers. It runs electronic ignition fitted to the original D23 distributor (no vacuum advance).

Thanks all!

The only way you will get the timing right is to road test the vehicle. The modifications you have listed will have a considerable impact on the 'all in' timing.
I would recommend that you set the timing at 28 to 32 degrees at 5,200 rpm (taken from the Marina wksp Man Pt No: AKM4580) and go from there.

Thanks Phil, that's great.

I take it you mean setting the all-in timing as a starting point, and then tweaking it on the road?

(I was concerned about high-speed detonation caused by over-advanced timing, which is apparently very difficult to detect.)

Yes - as a starting point. As that is the max advance and quoted in the manual you can work backwards (or leave as is) if necessary by road testing.