The 123MG-4-R is designed especially for the MGA and MGB. This unit offers vacuum advance.
| Brand |
MG |
|---|---|
| Cylinders |
4 |
| Operating voltage |
4-15V |
| Wires |
Black: coil '-', Red: ignition key (battery 6V / 12V) |
| Model |
Switch |
| Rotation direction |
CW & CCW |
| Vacuum |
Vacuum |
| RPM range |
500-8000 RPM |
| IE (D-jetronic support) |
Non IE |
| Environmental temperature |
-30 – 100 °C |
| Cap type |
Straight |
| Dwell |
Constant current: fully automatic adaptive dwell |
| Coil charging time-out |
After 1 second, coil current is turned off |
| Spark balancing |
<0.5 degrees |
| Maximum advance |
40 degrees crankshaft |
The 123\MG-4-R-V is designed especially for the MGA and MGB.
All the advance-curves, that were ever specified for these cars, are integrated into this product.
For MGC see 123\GB-6-R-VThe unit offers a maximum total of 16 advance-curves to be selected by the end-user.
Please take a look in the table below for available advance curves.
Do you want to know where to buy the 123Ignition in your area? Check out the dealer page!
| curve | advance starts [rpm crankshaft] | max. advance [rpm] | [degr. crankshaft] | vac. adv. starts [mmHg] | max. vac. adv. [mmHg] | [degr.] | replaces | remark |
| 0 | 500 | 2200 | 28 | 100 | 300 | 18 | MG-A DM2/40510 | set static at -10 degrees, HC at -5 degr. |
| 1 | 500 | 4400 | 24 | 100 | 300 | 16 | 40916 | 18GG (LC),18G,18GA,18GB,18GD |
| 2 | 500 | 2200 | 20 | 130 | 330 | 20 | 40897,41155 | 18G,18GA,18GB,18GD,18GG(HC),18GF,18GH,18GJ |
| 3 | 1000 | 4600 | 20 | 100 | 300 | 10 | 41339 | 18GK |
| 4 | 1000 | 4500 | 20 | 100 | 300 | 10 | 41370 | 18G584Z, 18G585Z |
| 5 | 1000 | 4300 | 33 | 100 | 300 | 10 | 41491 | 18V672Z, 18V673Z |
| 6 | 700 | 2200 | 14 | 130 | 330 | 20 | 41288 | 18V581F-18V583F-18V581Y-18V583Y (HC) |
| 7 | 700 | 4200 | 18 | 100 | 300 | 16 | 41290 | 18V581F-18V583F-18V581Y-18V583Y (LC) |
| 8 | 700 | 2200 | 19 | 75 | 200 | 14 | 41032 | 18V (HC) |
| 9 | 1000 | 6000 | 27 | 100 | 300 | 16 | 41234,41391,41692 | 18V892AE, 18V779F, 18V780F, 18V893AE |
| A | 1000 | 5800 | 24 | 75 | 550 | 24 | 41610 | 18V846F-18V847F |
| B | 1000 | 5000 | 26 | 100 | 300 | 10 | 41599 | 18V797AE, 18V798AE |
| C | 1000 | 4400 | 22 | 100 | 300 | 10 | - | intended for ‘stage 2’ engines |
| D | 1000 | 4500 | 29 | 100 | 300 | 10 | 41600,41643 | 18V801AE, 18V802AE |
| E | 1000 | 4500 | 29 | 100 | 300 | 10 | 41693 | 18V883AE, 18V884AE |
| F | 1000 | 4500 | 29 | 100 | 300 | 10 | 41695 | 18V890AE, 18V891AE |
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