Posted by Barry on July 29, 1999 at 10:38:18:
In Reply to: This should apply to a 75-76 530 (Long) posted by Erk on July 29, 1999 at 02:58:49:
: Long as Hell, sorry. .
: Thermactors/EGR
: As I will be removing aforementioned equipment, which should be left on?
: I know which lines got to the EGR, etc. And The silver box of Mystery Under the snorkel(Drehzahlschalter) along with his little counterpart
: is coming off too to make way for a CRANE. The thing I'm leery about is the vacuum retard. Does anyone have the info on how this really works -i.e. is it at all controlled by the Drehzalschalter? I know it can be hooked directly up to the intake, but I'd rather get straight facts then play the guessing
: game.(car has a centrifugal/mechanical advance, Vaccum retard)
: Therefore, on an Si, all of the RED, WHITE, and BLUE vacuum lines can safely come off. The thing I am concerned about is the BLACK lines. And the Dashpot they are connected to. I have one from the fuel pressure regulator, and one from the distributor for the retard, which runs along the spark plug wire casing on top of the valve cover.
: In addition to that, do you know how or where to hook up the vacuum retard? The silver box is a thermo-time switch (I'm guessing) and it controls when the black dashpot opens up to allow for the deceleration (retard) process to take place. (Or is this not how
: it works?) If this is disconnected, and a straight line is made from the Vacuum port on the distributor to the intake manifold (which one), How will it affect performance given the constant suction?
: Thanks for all of your help - I hope I'm not giving you guys a headache!
I've done this to my '76 530i: Removed the EGR valve and filled the opening in the intake manifold with an appropriately sized bolt with a rubber o-ring under it.
Removed the vacuum retard line from the distributor and installed a cap at the manifold. My local service shop says it's not necessary, and I agree.
Removed the air pump/diverter valve and all vacuum lines (blue,red,white and black) between the swithes and the engine.
Removed the thermal reactors and installed Stahl headers....