BenzWorld Junior Member
Date registered: Aug 2007
Vehicle: '00 C280; '85 300SD; '83 380SEC; '83 380SL
Location: Fort Worth, Texas
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I created a nice adapter between the 80s Ford Crown TPS and my throttle body. I CNC'-d it from a piece of aluminum. I can post pictures and specs if someone would like to see it. I also used my CNC (although I could have used a knife) to make the edge on the Ford TPS smaller diameter. The TPS fits perfectly, the bolts are right on, and the throttle body goes back to its place without any problems. I will try to create a mold so I can cast the piece from epoxy plastic if someone would like one (it will need a two-part mold).
Also, I have my Ford injectors now (I was debating using Volvo injectors as they would fit as well). Mike mentions that the ring and spacer should be reversed for a better fit. I made a playdoh mold of the injector hole. The problem with Mike's setup on the 380SL is that you can push the ford injectors in too much and the O-ring will go beyond the narrow seal surface in the cylinder head. To fix that I took some 1/4 inch washers (with inner diameters of about 8mm and turned them down to 14.5mm. They are only 1.5mm wide so I need to use an additional small (1mm diameter) viton ring (Harbor Freight). So in my setup it is: turned washer - small viton ring - viton ring - cap. With this setup the ring sits right where it should be sitting and the injector cannot be pushed further in than it should be.
Another difference between the 450SLC and the 380SL is that the 450 had the idle air hoses going to the manifolds. In the 380, the idle air hoses are connected to the plastic injector housings. Thus if I replace the injector I will need to find another way to supply "idle air" to the engine. I will probably use the EGR hose connection on the bottom intake manifold part and reroute it to the front to supply the idle air to all cylinders. This will also enable me to relatively easily connect a nice PWM solenoid or even better a stepper.
Another question to you guys is: Where did you get your manifold vacuum for the ECU? I would think that in order to have less pressure swings, the vacuum should be pulled from the bottom manifold and not just one of the fittings of the upper manifold. Unfortunately, the only two connections to the bottom manifold are the brake booster and the EGR. I will probably end up drilling yet another connection as I do not want to use either one of those (as the accessories attached to them would probably interfere with the readings). Please let me know where you connected your MAP sensor...