Improve the performance of your classic car with this highly reliable electronic ignition distributor

The 123GB-4-R-V replaces most 4 cyl. Lucas-distributors for engines in Great-British (hence ‘GB’) cars.
This unit is compatible with positive earth cars.

Note that there are dedicated 123-ignitions for Mini, Jaguar & MG.

Brand

Aston Martin , Austin , Landrover , MG , Mini , Morgan , Morris , Rover , Triumph

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

Yes

RPM range

500-8000 RPM

IE (D-jetronic support)

No

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\GB-4-R-V-POS replaces most 4 cyl. Lucas-distributors for engines in Great-British (hence ‘GB’) cars.

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.

Note that there are dedicated 123-ignitions for Mini, Jaguar & MG.

Please check if the distributor need a connection for a mechanical rev.counter, as a 123\GB-4-R-V-POS does not offer this.The 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.

GB4 / Mini / MG / Tune+-4-R-V-G / Tune-4-R-V-G = Suitable for Lucas 25D4 / 23D4 / 45D4    

GB-4-R-V-POS  = GB stands for the 123ignition type  
GB-4-R-V-POS  = 4 stands for the number of cylinders 
GB-4-RV-POS  = R stands for straight distributor cap 
GB-4-R-V-POS = V stands for vacuum advance
GB-4-R-V-POS  = POS stand for positive earth 

How to install a 123ignition distributor

Download the manual

Tune+ App Manual

Where to buy?

Do you want to know where to buy the 123Ignition in your area? Check out the dealer page!

curveadvance starts
[rpm crankshaft]
max. advance
[rpm]
[degr. crankshaft]vac. adv. starts
[mmHg]
max. vac. adv.
[mmHg]
[degr.]replacesremark
0100042001710030010LUCAS2000/5,0
1100036001710030010LUCAS2000/6,5
2100030001710030010LUCAS2000/8,4
3100025001710030010LUCAS2000/11,0
4100045002010030010LUCAS2000/6,0
5100045002010030010LUCAS2000/8,0
6100045002010030010LUCAS2000/10,0
7100045002010030010LUCAS2000/12,0
8100045002310030012LUCAS2000/6,5
9100045002310030012LUCAS2000/9,0
A100045002310030012LUCAS2000/11,0
B100045002310030012LUCAS2000/13,0
C100045002610030014LUCAS2000/7,5
D100045002610030014LUCAS2000/10,0
E100045002610030014LUCAS2000/12,0
F100045002610030014LUCAS2000/14,0

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