Difference between revisions of "Petrol engines Ignition advance curves"
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[[Image:DG~VS~DJ.jpg]] | [[Image:DG~VS~DJ.jpg]] | ||
'''Above:''' Centrifugal advance curves only (for comparison) | |||
Max Vacuum advance is quoted as 12~16 degrees for both DG and DJ (see below) | 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. | 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 and the DJ ''may'' not advance as much at high rpm (the table of ign. setting checks below is not the full story (i.e. they are just waypoints on the curve and don't necessarily indicate the maximum centr. advance for that distributor - IMHO) | |||
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|+'''DG and DJ Ignition timing settings''' | |+'''DG and DJ Ignition timing settings''' | ||
| '''1.9 DG ''' | |'''Setting'''||'''1.9 DG ''' || '''2.1 DJ''' | ||
|- | |- | ||
|Static timing||5°±1° BTDC@900±50||10°±1° BTDC@800 | |Static timing||5°±1° BTDC@900±50||10°±1° BTDC@800 | ||
|- | |- | ||
|Adv. check 1||0°-2°@1500||0°-2°@1050 | |Adv. check 1||0°-2°@1500||0°-2°@1050 | ||
|- | |- | ||
|Adv. check 2||10°-14°@2400||2°-6°@1300 | |Adv. check 2||10°-14°@2400||2°-6°@1300 | ||
|- | |- | ||
|Adv. check 3||24°-28°@4200||12°-16°@2400 | |Adv. check 3||24°-28°@4200||12°-16°@2400 | ||
|- | |- | ||
|Vacuum adv.||12°-16°||12°-16° | |Vacuum adv.||12°-16°||12°-16° | ||
|} | |} | ||
[[Petrol engines 1.9 Timing| Timing a DH or DJ, technique.]] | |||
[[ | [[Petrol_engines_aircooled_Ignition_02#009_Distributor| 009 Distributors]] | ||
Latest revision as of 20:57, 30 September 2010
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 and the DJ may not advance as much at high rpm (the table of ign. setting checks below is not the full story (i.e. they are just waypoints on the curve and don't necessarily indicate the maximum centr. advance for that distributor - IMHO)
| 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° |
