(Home) Ignition timing - advancing & retarding

Just a quicky...
If a vehicle is set at 12 btdc and then moved to 6 btdc.... has it been advanced or retarded?

- (#14236) chris turner, 21 Nov 04 06:18

retarded, btdc means before top dead centre, therefore the higher number the more advanced the ignition.

regards rob.

- (#14236) Rob Drinkwater (CAFTEC), 21 Nov 04 12:03

Thanks Rob...I knew that (once)..but..for the last 10 yrs or so have been getting it back to front.

- (#14236) chris turner, 21 Nov 04 13:59