Bosch ZEA & ZEB
2-Plunger Fuel Injection Pumps
The dawn of fuel injection
Bosch fuel injection pumps provided increased performance, fuel efficiency, cleaner emissions and more control over the performance of the pump in relation to the engine, allowing minute adjustments to improve overall performance.
While designs advanced at a rapid pace throughout the decade, earlier pumps like the ZEA R3 (pictured) still marked a vast improvement from carburetors and were used by Mercedes-Benz on their luxury models as early as 1958. The R3 was first used in coupes and cabriolet variants of high-end models such as the W128 220SE "Pontons" from 1958-1960, and early W111 220SEbs.
EP/ZEA 2 KL 75 R1: Feb 1958-Feb 1959
EP/ZEA 2 KL 75 R2: March 1959-June 1959
EP/ZEA 2 KL 75 R3: July 1959-Dec 1959
ZEA MODEL DATES
The ZEB model was first released in June of 1962 with the R11 and the R13 and featured a number of improvements from the ZEAs. Various mechanical adjustments include modified pressure valves and increased idle performance. Obvious differences include the replacement of black oxide plating with more resilient zinc plating and the reduced size of the corrector assembly extending from the right-upper-portion of the pump on the R3 allowed easier access to the governor, better idle control and more room for install and removal of the pump.
INFO TO COME
ZEB MODEL DATES
