MG-4-R-V-POS

Brand	MG
Cylinders	4
Operating voltage	4-15V
Wires	Black: coil '-', Blue: battery negative, 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
Positive earth supported	Yes
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-POS is designed especially for the MGA and MGB.

This unit offers “Positive earth” option. This means the unit can be used on positive earth cars. ( + of the battery connected with the chassis of the car) It is also possible to use this unit on a negative earth car.

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.

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Download the manual

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The complete tutorial

How to install a 123ignition distributor

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

Where to buy?

Download the manual

How to install a 123ignition distributor

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