Mercedes-4-R

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

The 123MERCEDES-4-R is designed for the W110, W115 and W123 4 cylinder engines, in the Mercedes :

– 190C
– 200
– 220
– 220US
– 230

Brand	Mercedes
Cylinders	4
Operating voltage	4-15V
Wires	Black: coil '-' , Red: ignition key (battery 6V / 12V)
Model	Switch
Rotation direction	CW & CCW
Vacuum	No
RPM range	500-10.000 RPM
IE (D-jetronic support)	No
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

Categories: Mercedes Benz, Switch

The 123\MERCEDES-4-R-V is designed for the W110, W115 and W123 engines, in the Mercedes :

– 190C
– 200
– 220
– 220US
– 230

Next to the standard-curves, it offers optimised advance-curves for driving on LPG or E85, the new Bio-Ethanol-fuel of the future.

For cars with Bosch ‘D-jetronic’ injection-systems, order the 123\MERCEDES-4-R-V-IE.

The unit offers a maximum total of 16 advance-curves to be selected by the end-user.
Please take a look in the curve table for available advance curves.

Mercedes – 4 – R = Mercedes stands for the 123ignition type
Mercedes – 4 – R = 4 stands for the number of cylinders
Mercedes – 4 – R = R stands for straight distributor cap

How to install a 123ignition distributor

Download the manual

Download 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!

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curve	advance starts [rpm crankshaft]	max. advance [rpm]	[degr. crankshaft]	vac. adv. starts [mmHg]	max. vac. adv. [mmHg]	[degr.]	replaces	remark
0	600	4600	35	125	250	11	BOSCH 0231 115 064	W115 1:9,0 200,220,230
1	600	4600	35	125	250	11	0 231 115 064 as curve #0	for LPG/E85
2	700	4400	24	100	300	17	0 231 170 237, 0 231 170 138	W123 1:9,0 200,230
3	700	4400	24	100	300	17	0 231 170 237, 0 231 170 138	as curve #2 for LPG/E85
4	700	4600	35	100	250	11	VJUR4 BR27T, 0 231 115 027	W110 1:8,7 190C
5	700	4600	35	100	250	11	VJUR4 BR27T, 0 231 115 027	as curve #4 for LPG/E85
6	700	4600	35	100	250	10	0 231 115 052	W110 1:9,0 190C, 200
7	700	4500	35	100	250	10	0 231 115 052	W110 1:8,6 200
8	700	4500	35	100	300	10	0 231 115 060, 0 231 115 065	W115 1:9,0 220US ask a profi!
9	700	4600	35	100	250	11	0 231 115 052	W110 1:9,0 for LPG/E85, 190C, 200
A	700	4600	35	100	250	11	0 231 115 052	W110 1:8,6 for LPG/E85, 200
B	700	4600	35	100	250	11	VJU4BR29, VJUR4BR27, VJUR14 & 22	MERCEDES 180A & 190
C	800	4000	45	100	250	10	VJUR4BR28, 0 231 115 029	MERCEDES 180B
D	700	2600	27	100	300	10	VJUBR11, VJR4BR24	MERCEDES 190SL
E	-	-	-	-	-	-	-	-
F	600	3200	30	100	350	20	VJUR4BR6, VJUR4BR17	Borgward Isabella