HAILERS

Ok. 87N/A. Car is idling. Pull the vac hose from the oil injector spider off the dynamic chamber. Good vacuum(finally learned how to spell vac) on the hose from the spider. Put my finger on the nipple on the dynamic chamber. No vacuum. Darn. Rev the engine to at least 8000. Nada vacuum. None at all. Whats up doc? Does it require a load on the engine for a vac to exist at the dynamic chamber? Anybody. No good answers and I'll change the dynamic chamber with another. I think I have more than less an idea of how the injectors work as far as the requirement for an equal pressure on each side of the injector goes, so why is'nt there a equal vaccum on the nipple side of the injector. Did that make sense?

Brian P

There should be vacuum there all the time.. That is just a hole into the manifold. Nothing controlls it. From what I've been told the vacuum lines are so that there isn't suction at the injectors in the housings.. If there was then you wouldn't need the pump, it would suck your oilpan dry.

Are you using alot of oil?

HAILERS

Brian P. I checked my 87 and the wifes 86, both N/A, and there is no vac at the nipple at idle or 80mph. Irv, Keith's mechanic, says that on his turbo there is a constant vaccum. So I've somehow got two N/A that are defective? Guess so. Gonna go out and check the turb and see what's there. If anyone reads this and has a N/A, if you will start your car and pull the large vac hose from the spider, and see if the nipple on your dynamic chamber is pulling a vacuum, please. Two out of two bad?Make that three out of three. The turbo is like the others, just a trace of vacuum at the dynamic chamber side. On all three cars there is a strong vac coming from the injectors side as expected. Just a puke vac at the intake manifold(dynamic chamnber side.)

HAILERS

Took the 87 intake apart. The large nipple that goes to the oil injector spider, travels from the large nipple, thru the black phenolic block, to a hole , a large quarter plus hole, in front of the butterflys. That air is not a vaccum. The next nipple down goes the same route , different passage, to the same ambient air as the large nipple. The lowest nipple travels thru the black phenolic material to a hole just aft of the primary butterfly. VAcuum there at idle. Lesson learned........all supposed vacuun nipples are not all vacuum . The rear two nipples also travel different paths and are not equal in function. So it matters where a given hose goes as far as those five vac hose go. Now to tear down the turbo intake and find out where the large nipple starts out.

HAILERS

Now for the turbo. On the 87turbo there are three nipples. The only one that I see having a vacuum is the bottom one. Its final hole is just behind the bottom two butterflys, vacuum side of the butterflys. The upper three nipples are all intertwined in the black phenolic spacer and their final entrance/exit is in front of the butterflies, similar to the N/A arrangement. Its that large 1/4 inch hole b/t the lower two butterflies. Don't see how the large one could ever have a vacuum if it origin is in front of the butterflys. Figure my car is ok, even if I don't have a vac at the nipple side of the oil injectors. Temporarily I give up trying to figure the oil injectors out.