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Bosch Fuel Injection Pump Models
What FUEL INJECTION PUMP
MODEL DOEs YOUR CAR HAVE?
Fuel injection pumps are not one-size-fits-all. Not only does each vehicle have slightly different variables to address as well as each pump needing specific and minute adjustments, but there are a number of models which you may encounter, each with its own unique characteristics and innovations as the technology improved. Here you'll find a comprehensive list of Bosch Fuel Injection pump models along with some details on what makes each model unique and in which vehicles you'd expect to find them.
Governor PROD. YEAR SPACE CAM
R11
1/1R JULY 1963 - DEC 1965 1 or 1X
1/9R JAN 1966 - JAN 1967 25
The R11 was the first Bosch fuel injection pump made for the W113 and has a number of unique specifications that differentiates it from its successors.
The most obvious is the small viewing port for the plungers and springs, making these virtually inaccessible without disassembly of the pump body. Another is the lack of a stop solenoid on the right which was added for the R18.
VEHICLES: W113 230SL
Governor PROD. YEAR SPACE CAM
1/11R DATES TO COME 8
R18
1/11R
1/16R
R18Z
8
32
R18Y
1/15R
33
The R18 featured some upgrades to the original design of the R11 and was eventually developed into a separate pumps for the Unites States (y) and European (z) markets.
Obvious differences include a larger viewing and access port for plungers and springs and a start and stop solenoid. It also features a longer pump housing and modified three-dimensional cam. The R18 was replaced by the R18Z which has ball pressure valves, no oil check valve and richer adjustment. The R18Y has a stop magnet, modified three-dimensional cam and guide tube for full-load adjustment screw.
VEHICLES: W113 250SL, W111 250SE
Governor PROD. YEAR SPACE CAM
1/18R DATES TO COME 35
R20Y
The R20Y and future pumps carried over the larger access port for plungers and springs. Minor adjustments can be seen in the bulk of the pump body, which was significantly reduced. Vestigial ports have been removed altogether while the body is slimmed down.
The R20Y was fitted with both start and stop solenoids and has force-feed oil lubrication.
VEHICLES: 280SL, 280SE, 280SEL, 300SEL
Governor PROD. YEAR SPACE CAM
R21
1/19R
39
The R21 carried over many characteristics from previous pumps but has a different three-dimensional cam from the R20 and features both start and stop solenoids.
VEHICLES: W113 280SL, 300SEL
Governor PROD. YEAR SPACE CAM
R22Y
1/26R
48
The R22Y carried over many characteristics from previous pumps along with some minor improvements specified for the U.S. market.
Characteristics include no starting solenoid, 4mm ball thrust valves, and a different three-dimensional cam.
VEHICLES: 280SL, 280SE, 280SEL, 300SEL
Governor PROD. YEAR SPACE CAM
1/27R
1/38R
R23
39
The R23 carried over many characteristics from previous pumps along with some minor improvements.
Characteristics include no starting solenoid, 4mm ball thrust valves, and a different three-dimensional cam.
VEHICLES: 280SL, 300SEL
COMING SOON
Governor PROD. YEAR SPACE CAM
R24Y
1/33R
1/45R
48
51
The R24Y carried over many characteristics from previous pumps along with some minor improvements specifically for the U.S. market.
Characteristics include no start or stop solenoids, 4mm ball thrust valves, and a different three-dimensional cam. When installed on automatic transmission vehicles the vacuum control at the venturi control unit and throttle control linkage with dead travel are eliminated.
VEHICLES: 280SL, 280SE, 280SEL, 300SEL
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