After searching around, I've found where several people have eliminated the secondary injector air bleed sockets by replacing them with an o-ring. My question is; what size/number o-ring do I need? Everything I've read says to measure the air bleed to find the thickness, but my air bleeds pretty much disintegrated when I took my injectors out. Any help is appreciated.

 

I found part of one that was still somewhat intact. Looks like it needs to be 8mm thickness and 10mm I.D.

 

The air bleeds are there to atomize the fuel/air better at low intake air speed. Why would you remove them? What reasons are people listing for removing them? Just to save money and not replace a broken part? Honest question, not being sarcastic.

 

Some aftermarket injectors do not fit with them in place. The newest revision of ID injectors do not fit for example, where models a few years older did. If using a Denso cushion with your injectors, it will seal fine.

 

The bottom of the air bleeds looks something like that little plastic table that you get in the middle of your pizza to prevent the cheese from sticking to the box.
The legs can get brittle and break off and get ingested,so guys get rid of just that part and keep the barrel that inserts in the irons to keep the height of the injector correct.
If you use the stock injectors then they are helpful,but the new aftermarket injectors usually have an very efficient spray pattern anyways,so for that fact the engine can run without the extra part on the bottom that is usually used in the stock injection system.

 

Interesting, Daniel and Styx. But without the air bleeds, aren't you introducing a vacuum leak?

I saw a pic. posted not too long ago, and it showed air from atmosphere being sucked in. I don't know where that air passage is on the engine specifically or how it does its thing, since the pic. is a drawing only. I understand the air bleed does two jobs (air bleed and deflect injector stream), but the description is confusing and doesn't help pinpoint the exact location it gets air from (pics of the outside showing a real life location would help lol). Pic attached.

 

I have a pair of 1000cc ID injectors that are just over a year old from Turblown that are working just fine in the secondary injector spots with brand new airbleed sockets/diffusers(s5 tii).


The there is a vacuum nipple on the lower intake manifold(center between the primary runners below the oil injector ports on the manifold) that routes to a metered air port at the top of the plenum.

 

I have a brand new set of ID2000's that say otherwise I previously had a set of ID725's and ID1000's, both between 1-2 years old, and the actual bottom seal is integrated into the injector differently.
Here we have a brand new set of ID2000's, note how wide the bottom hard seal is, pushing against the Denso cushion.



Here we have an older set of ID725's, note how much smaller the bottom hard seal is. This will clear the air bleeds without issue, the revised seal shown above will not.

 

Well, there's another nipple I have to find

 

I never said to get rid of them.
I said to get rid of the bottom Brittle plastic screen that is supposed to atomize the fuel.

Stick your finger inside a port(not the injector hole) in the iron and you can feel this part..It is a diffuser that is built on the plastic insert air bleed.
It's kind of funny though,when you think of it,that the injector would spray..then hit a Plastic piece with holes in it to "atomize the fuel"..
You look at that piece and think that it would hinder the spray..not help it.