123/MG-4-R-V for MGA and MGB (negative ground)

€345.00
VAT included

The 123/MG-4-R-V is designed specifically for the MGA and MGB, both negative ground! All the advance-curves, that were EVER specified for these cars, are integrated into this product. In addition, there is a fine-tuned curve for the so called 'stage-two' engines too!

Distributor cap: Straight (R)
Quantity
Ships within 1 week

The 123/MG-4-R-V is designed specifically for the MGA and MGB, both only negative ground!

All the advance-curves, that were EVER specified for these cars, are integrated into this product. In addition, there is a fine-tuned curve for the so called 'stage-two' engines too!

Static-timing is on TDC for all MGB-engines.

For a MGC please order a 123/GB-6-R-V.

The unit offers:

- Vacuum-advance
- Automatic dwell
- Automatic power-cut after 1 second
- Gear shift retard

Please read the installation manual carefully. It contains more information on the motor- and distributor numbers, static timing and the advance-curves (often found on the last page), the specifications of the 123ignition and a step-by-step description of the installation procedure.

Note: Although used coils all look alike, they should be viewed with suspicion since one cannot tell from the outside whether, and how often they were exposed to overheating in the past. Installing the 123ignition system will ensure that the coil will never be overheated again in future. We recommend the 123 Blue Coil.

Perhaps you'll also need new spark plugs? At 123ignitionshop we recently added the spark plugs most commonly used in combination with the 123ignitions we offer. See: the spark plugs list.

Complete set

Now also the complete set can be ordered in one go: a 123/MG-4-R-V distributor + 123 Blue Coil + set of 4 spark plugs WR7DC + spark plug cables

Data sheet

Cylinders
4
Direction of rotation
CW/CCW
Voltage
4,0 - 15,0 volts
Range
500 - 8000 rpm
Temperature
-30 to 100 Celsius
Coil
Stock or high energy coil, primary coil NOT below 1,0 ohm
Dwell
Constant current, fully automatic
Time-out
After 1 second current is switched off
Accuracy
Less than 0,5 degr. crankshaft
Vacuum
With vacuum, also works without when not connected.
Max. Advance
45 degr. crankshaft
Wiring
red +6V of +12V, black - coil
Grade 
Chris cains 2020-10-11

123 mg 4/r/v

Thank you so much .I've just fitted the 123 distributor to my 1970 mgb gt the car now runs far better and smoother than it ever has.looking forward to clocking up many more miles.

Grade 
Richard 2020-06-17

The best you can get

I purchased the 123/MG-4-R-V for my 73 MGB Roadster and what a good choice, not cheap but well worth it, easy to fit with good instructions and back up, I think the 123 is the best you can get if you want trouble free motoring.

Grade 
Louis MATTEI 2018-08-10

Bon produit

Good item, easy to fit and easy to adjust, what I appreciate also :
- strength of the spark, associated with the Bosch Blue coil
- and also : speedness, information and support from 123Ignitionshop

Grade 
Ian Aldous 2018-05-29

At last a reliable replacement!

My wife has owner her 1972 MGB for 37 years and at last we can feel confident that not only will it start easily, but will also keep going!
Easy to fit and looks original, but shows how much car electronics has improved over the years.
I have no hesitation in recommending 123ignitionshop, their service was faultless, rather like their product.

Grade 
Hugh Wylie, Edinburgh, Scotland,UK 2016-01-29

very good product

Since installing the 123 ignition system in my 1971 MG B, the car is performing very well. The power has increased, the economy has improved, the car starts first time, there is no overheating, and no 'running on'. The new electronic ignition, which my son and I fitted from the very clear instructions, has given new heart to the old car, and it feels much more robust, but still retaining the character of the MG. Thank you LEEN APK, I would definately reccomend this product to other classic car ownwers

  • 1 out of 1 people found this review useful.
Curve Advance starts
(rpm crankshaft)
Max. advance
(rpm / degree crankshaft)
Vacuum advance
starts (mmHg)
Vacuum advance
ends (mmHg / degr.)
Replaces Remark
0 500 2200 / 28,0 100 300 / 18,0 MG-A DM2 / 40510 set static at -10 degrees HC @ -5 degr
1 500 4400 / 24,0 100 300 / 16,0 40916 18GG (LC), 18G, 18GA, 18GB, 18GD
2 500 2200 / 20,0 130 330 / 20,0 40897 / 41155 18G, 18GA, 18GB, 18GD, 18GG(HC), 18GF, 18GH, 18GJ
3 1000 4600 / 20,0 100 300 / 10,0 41339 18GK
4 1000 4500 / 20,0 100 300 / 10,0 41370 18G584Z, 18G585Z
5 1000 4300 / 33,0 100 300 / 10,0 41491 18V672Z, 18V673Z
6 700 2200 / 14,0 130 330 / 20,0 41288

18V581F, 18V583F, 18V581Y, 18V583Y (HC)

7 700 4200 / 18,0 100 300 / 16,0 41290 18V581F, 18V583F, 18V581Y, 18V583Y (LC)
8 700 2200 / 19,0 75 200 / 14,0 41032 18V (HC)
9 1000 6000 / 27,0 100 300 / 16,0 41234 / 41391 / 41692 18V892AE, 18V779F, 18V780F, 18V893AE
A 1000 5800 / 24,0 75 550 / 24,0 41610 18V846F, 18V847F
B 1000 5000 / 26,0 100 300 / 10,0 41599 18V797AE, 18V798AE
C 1000 4400 / 22,0 100 300 / 10,0 --- intended for ‘stage 2’ engines
D 1000 4500 / 29,0 100 300 / 10,0 41600 / 41643 18V801AE[CC], 18V802AE[CC]
E 1000 4500 / 29,0 100 300 / 10,0 41693 18V883AE[CC], 18V884AE[CC]
F 1000 4500 / 29,0 100 300 / 10,0 41695 18V890AE[CC], 18V891AE[CC]

Accesories