Injector pics...and a question.

[aspoonhour]

Thought I'd post a quick from a couple of weekends ago...

One of the injectors from my truck...



...in pieces!!

Now that I've had them apart, I have a bit better understanding of how they function, but I'd like to know what affects the "pop" pressure? I would assume that it is the spring tension, no?

On a different note, this injector had 2 of the little washers in the body, the other five only have one. This particular inj body appears to have a deeper center bore, although it has the same PN, etc as the others.

I also have a set of stock '93 injectors that are the same PN on the body, but the tips have different part numbers...wonder how they differ?

Oh yeah...yes, this injector went back into the truck and ran fine.

Sooo...Are things like this just useless banter? If so, I won't post stuff like this. I'm always willing to take some pics of something AND always willing to help post pics, for those who aren't able.

Thanks for the help gang!!!
Andrew

[jogl]

Yes, you set the pop pressure by adjusting the spring compression.

It is interesting that one injector is different.

How did you set the pop pressures when you reassembled the injectors?

Nice picture.

Good Day,
JP.

[aspoonhour]

Pop pressure...It should have stayed the same upon re-assembly, correct? I did them one at a time so no parts were mixed up. Would pop pressure change while doing only a disassemble and reassemble? Don't see how, but that is why I'm asking...

Andrew

[PToombs]

Pop pressure shouldn't change if you didn't change shims. If they had a different number of shims, I'd take them and get them all tested to see if they pop the same. JMO.

And I don't think pics like this are worthless banter. Unless it's been posted 16 hundred times. Like the pics of somebodies 2nd gen.

[aspoonhour]

That makes me feel a little better. I have another set of injectors on the way, so one of the sets will be sent out to be properly cleaned and checked.

Still fun to see how these things go together...

Thanks!
Andrew

[jogl]

I did not know that you need shims to adjust the pop pressure on these injectors. Obviously I have never had mine apart. On all of the injectors that I have worked on you adjust the spring compression with a threaded fastener. So once you take the injector apart you pretty much have to reset the pop pressure when you reassemble.

Good Day,
JP.

[fasttalker83]

make sure that you measure the shims with a mic and even though you put all the same size shims in you may not get the same pressure's just as long as they are with in 100psi of each other they will work and I hope and pray you didnt touch the needle in the tip with your bare hands-fingers, reason is that this is one of those things that you dont want to touch with out diesel on your fingers or nitrile's on cuz the natural oil from your body can mar this and not make it slide in the tip normal POP OFF PRESSURE IS 3800 FROM STOCK shim it up to about 42-4300 for better spray and atomization PLUS the intermediate plates are not all the same that is the difference between a non ic and ic motor old ones are non beveled plates newer ones have a bevel in them for the needle in the tip-this was one of the changes between the 9-7mm tip hope some of this helps

[PToombs]

Pop pressure for I/C injectors is 3550, per the FSM. Don't jack it up much or you will be rebuilding the VE next. They won't take the abuse of high pop pressures.

[aspoonhour]

As usual, great info!!! Bad news? I touched 'em with my fingers... Good news? I have another set on the way that I will have checked and tested. You can tell there are some close tolerences in the injectors tips, but I would never have thought about that sort of contamination. When I get the "new" ones done, it will be interesting to how the current set is...

Thanks for the info. I appreciate it!!!

Andrew

[PToombs]

I don't know why you can't clean them again and assemble them with gloves or what ever.

[sdstriper]

That's what I would do, and... on that subject, there are many parts in the VE you should not touch with your bare skin. Wear the gloves, pretend your Chevy Chase, whoooa doc, ever been to prison...

[aspoonhour]

Re-clean them... Yeah...I'll do it...."Moooon Riivvverr".

Thanks!
Andrew