Hello,

I went single on my car and wanted to know what i should do with oil jets. Do i need to hook them to intake manifold or can i just put a cap on it? i have searched but didn't find the answer.

thanks

 

There have been two threads in the past couple months covering this extensively in the single turbo forum. They are supposed to see filtered ambient air. If you can them they won't be vented and if you hook them to the intake they'll see vacuum and boost. The stock routing does nothing more than vent them in front of the turbos which is the filtered ambient source you need.

 

The stock oil injectors basically sees a vacuum 100% of the time. So they need to have a constant vaccum source.

 

Wrong.

 

Wrong.

https://www.rx7club.com/forum/showth...t=injector+oil


When the injector sees vacuum the check valve is pulled closed by the vacuum. They need filtered ambient pressure.

 

ok so, why does it smoke more when its plugged??? i read a thread where it was explained that the injectors don't need actual "vacuum" for the check valve to be closed; for example, 'if you were to dip a straw in water and plug the whole up with your finger then pull the straw out, the water will stay in the straw'. it was explained that the check valve is open not ONLY because of the vacuum from the turbo but because of the vacuum from inside the housing when the rotor is spinning in conjunction with the vacuum from the turbo. i read that mazda plumbed it into the intake before the turbo so that when the engine is shut off, oil would not be dumped into the housing to prevent smoke on start-ups. please DONT flame from this. it was explained in detail by someone and from the way the check valve works, it only seems logical. i'm not saying that its right. it seems like everyone has different views on how it all works.

 

It basically sees a vacuum no matter what!!! The only vacuum line from the Oil injectors to anywhere is in front of the primary turbo inlet. Which causes a vacuum. Take a fan and put a tube on one end and tell me you will not get some vacuum pull even at low speeds/idle. Maybe I should have stated at a constant vacuum except when the car is OFF.

If it doesn't have a vacuum to pull the rubber valve closed then it would/will pump oil into the intake system by way of the vacuum line. I personally believe this is where alot of the intake track oil comes from. I have removed, replace, cut open, etc. my old oil injectors to find out they had a pin sized hole which was causing oil to be pumped in before the primary turbo. I replaced the injectors and amazingly I had basically no oil in the IC. Also while I was doing this I fabbed up a little catch can and placed it in the vacuum line between the inj. and the primary turbo inlet which filled rather quickly, but after I replace the inj. I got nothing.