Petrol engines Ignition advance curves

Above: Centrifugal advance curves only (for comparison)

Max Vacuum advance is quoted as 12~16 degrees for both DG and DJ (see below)

SteveW: Using a 2.1 DJ distributor for a 1.9 DG

I think that they are probably close enough and the engine is running a treat on LPG and a quick check on 98 ron seems Ok too.

HarryMann: Good to use the correct distributor if you have one, though the curves do look the same slope after the first 250 rpm

DG and DJ Ignition timing settings

Setting	1.9 DG	2.1 DJ
Static timing	5°±1° BTDC@900±50	10°±1° BTDC@800
Adv. check 1	0°-2°@1500	0°-2°@1050
Adv. check 2	10°-14°@2400	2°-6°@1300
Adv. check 3	24°-28°@4200	12°-16°@2400
Vacuum adv.	12°-16°	12°-16°

Timing a DH or DJ, technique.