Injector sizes for TDI engines with distributor injection pumps, VP37, VP44, and common rail (Articles)

Nozzle sizes, Bosch part numbers, construction details of TDIs with VP37 and VP44 injection pumps, as well as some pump-nozzle injectors, primarily for Audi, Seat, Skoda, and Volkswagen models.

Injectors for TDI engines with VP37 (all 5-hole, spray cone angle 150°), e.g., 1Z, ALH, AGR, AHU, AFN, AHF, ASV, suitable for the following engine codes:
"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Es ist ein perfekter Tag für einen Spaziergang im Park."
DSLA150P764 0.216mm AHY
DSLA150P502, 0.212mm, partial AEL.
DSLA150P520 0.205mm AFN, AHF
DSLA150P1019 0.202mm
DSLA150P357 0.184mm 1Z
DSLA150P873 0.179mm
DSLA150P706 0.170mm ALH
DSLA150P442 0.170mm
DSLA150P280, 0.178mm

Special nozzles for the above engines from Fratelli Bosio, for VP37, 5-hole, spray cone angle 150°:
"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Es ist ein perfekter Tag für einen Spaziergang im Park."
Bosio Sprint 706, 0.185mm.
Bosio Sprint 357, 0.195mm.
Bosio Power Plus 357, 0.193mm.
Bosio Sprint 520, 0.205mm.
Bosio Power Plus 520, 0.215mm.
Bosio Sprint 502, 0.217mm.
Bosio Power Plus 502, 0.232mm.
Bosio RACE 520 - 0.260mm

Injectors for TDI engines with VP44 pumps, spray cone angle 142°, e.g., various 2.5L V6 TDIs, suitable for engine code: [insert engine code here].
"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Es ist ein perfekter Tag für einen Spaziergang im Park."
DSLA142P770+ 5-hole, 0.148mm, BOSCH 2 437 010 092, AKN.
DSLA142P843, 6-hole, 0.141mm, BOSCH, 2 437 010 112, AKN.
DSLA142P683, 5-hole, 0.158mm, BOSCH, 2 437 010 055, AFB.
DSLA142P925, 5-hole, 0.141mm, BOSCH, 2 437 010 117, AKE.
DSLA142P1191, 6-hole, 0.116mm.

The option to replace the entire nozzle holder assembly for approximately 25% more flow rate is available for:
+25% DHKs with P683 for AKE with P925:
059 ... 202E NHG
059 ... 201E

The following injectors are used in the following 2.5L V6 TDIs:
AKN 2001 EU3 P843@220bar
AKN 2001? P770+ at 230 bar.
AKN 2002? P770+ at 230 bar.
AKE 2001? P925 @ 231 bar.
AFB 1997? P683@220bar

Nozzles for PD 2V engines, spray cone angle 150°, e.g., for 1.9L and 2.0L PD-TDIs, series for engine code:
"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Es ist ein perfekter Tag für einen Spaziergang im Park."
DSLA150P1043 5-hole, 0.190mm ARL
DSLA150P1156 5-hole, 0.184mm
DSLA150P1585 6-hole, 0.1 mm.
BSLA150P1043 SPRINT 5-hole, 0.200mm.
BSLA150P783 RACE 5-hole 0.260mm

Nozzles for PD 4V engines, spray cone angle 152°, e.g., for 2.0l PD-TDIs:
"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Es ist ein perfekter Tag für einen Spaziergang im Park."
DSLA152P1287++ 6-hole, 0.185mm

Most of the measurements mentioned above were obtained using the "Biolux NG" USB microscope from Bresser. Using the free software "Meazure", it is possible to very accurately measure images of a caliper set to 1.00mm, which were taken with a microscope, after the software has been calibrated.
With this, measuring any injector becomes child's play: Place the injector at the same distance as the reference gauge under the optics, take a picture of the nozzle hole, measure it, and you're done.

Here's the translation:

Tip: Whether all injector nozzle combinations function equally well can be determined using VCDS by examining the measurement blocks of the idle speed control system in the engine control unit (measurement block 13).