Orignal article by: Jeff Mulchahey
It strikes me that some confusion exists over exactly which Kugelfischer mechanical injection pumps were used on which models of cars and in which market. First, the 2 liter engine with mechanical fuel injection vas used in several cars which we really newer saw in this country.
Aside from the ’02 series, what we know as the Tii motor BMW also used a Tii engine in the older 2000 sedan (2000tii) and the first 5-series (520i) body.
Here is a partial breakdown on which cars used which pump, excluding limited rarities such as Alpina, racing, Turbo derivatives or the 5-series.
Model Pump Designation Kugelfischer Number
1969-71 2000tii PL04-124.01A-1 & A-2 92 004 010 1971 2000tii and PL04-124.01 B-1 or 92 004 011 1972-73 2002tii PL04-124.01 C-1 92 004 012 1974 2002tii(USA) PL04-124.02 A-1 92 004 020
- The early cars utilized a slightly different throttle linkage arrangement which lead to the A-series pumps not being interchangeable with the B-series or later pumps.
- The later (i.e. 1974) USA market cars utilized a pump (124.02) which contained a different fuel delivery cam (see below).
Interestingly, my 1976 hard copy parts books shows that the early European and USA cars used the same pump 13 51 1 256 536 (BMW number, new parts only are listed here-not A1 or Y1 numbers) which is superseded to 13 51 1 259 887. This 887 pump is listed for European only models while the later ’74 USA cars used the unique number 1351 1 259 535. However, my 11/85 microfiche shows only the 13 51 1 259 882 part (the AT version of the 887 part) and the 13 51 1 259 535 part as being available, with the former applied to European models and the latter applied to US models.
Two things become apparent from this.
- First is that the earlier USA market cars carried the same injection pump as did their European contemporaries. To support this, a local 1972 USA market tii carries a pump labeled PL04-124.01 B-1 and 92 004 011 and Chris Schleicher tells me that the 92 004 Oil pump is the prevalent version in Bavaria.
- Second, I conclude that the pump shown above currently as the European pump is functionally the same as the early USA pump with the V7 cam.
- The “current” USA pump (259 535) is in fact the later USA version.
According to Kugelfischer literature, the 124.01 A1 and A2 pumps differed from later pumps as far as a running change occurred in the throttle body which made those pumps incompatible with the later throttle bodies due to alterations in the cam which complement changes to the throttle pump with the V6 cam.
My 11/73 microfiche for the 2000tii agrees with the 1976 2002 book. I further suggest that although the above information on pump designation vas obtained from Kugelfischer publications and shows that the various pump had differing designations at Kugelfischer, BMW AG considered all the 124.01 pumps to be functionally identical except the 1974.
The V6 cam vas used on the 1974 models while the V7 cam vas used on earlier cars. Recall that the 1974 USA cars had to meet more stringent exhaust gas emission standards and that most of the emission tests were done at idle and under part throttle acceleration. This probably explains why the V6 cam is leaner than the V7 cam at low speeds.
I have included as figures a copy of a graph by Dave Redszus which vas published in a previous tii Register Newsletter. In it, Dave shows fuel delivery profiles for the V6 and V7 pump cams. The positions P1, P2, P3, and P4 correspond to the idle, low partial throttle, high partial throttle, and full throttle pin settings at the enrichment lever on the engine-side of the pump. It appears that all the tii pumps, except the 1974 USA pump, used the V7 fuel profile. The 1974 USA pump used the Y6 cam.