I am in the process of redoing my fuel system. When I disassembled the system, I found some things I have not seen before, and I also wanted to verify the identity of the injectors to be sure they are worth be sent out, as opposed to buying new. The first are supposed to be 1600s, they had 3 O rings sealing them, and the O rings seemed to be the wrong size. I would think there is a single seal ordinarily.They have what looks like the Bosch logo, and the number 927 stamped on them. If they are good where can I get all new soft parts for them? Carl

 

in this picture you can see, the O rings were damaged, perhaps near blowing out.

 

Here are the primaries, they are supposed to be 720s, or 850s. one pintel is flush with the cap, and one is very slightly recessed the main number on these is 195500-0900. These also had a large spacerwhich was in the housing.

 

in this next picture the spacers are removed

 

Notice in the above picture the rubber grommets are different, and the smaller one is crushed. also here are those grommets.

 

Last the screw in the pulsation dampner was not threaded into the dampner, it was just rattling around in the dust cap, good thing the diaphram did not rupture... So, what are these, and are they worth sending out for cleaning, and flow testing? Thanks, and please see my next thread on modding my stock rails. Carl

 

these are 680's low impedance gslse injectors
matt

 

So they are a Mazda 680? Thanks, I'll be replacing those given my 450-500rwhp goal. Next...

 

I think those are the incorrect grommets on those gsle injectors. The grommet with the top and bottom lip is supposed to be on top and on the bottom of the injector is supposed to be a beveled lip (recessed) like in the picture of the 1600s. I think that is why they were crushed. Did you happen to have fuel leaks or anything? I once pinched one of the orings putting the injectors into the rail and it didnt seal.

I'm not too sure about the 3 orings on the 1600s either. It looks like they were causing friction between themselves and caused them to wear out. I always lube up my oil rings with oil before putting them in but I'm not too sure that would work with 3 orings or not since they would probably dry out.

I believe you can also figure out what size they are by attaching them to the fuel rail and then hooking the injectors up to a power source and then measuring how many CC's come out. If you decide to do this it will only be an approximate number since they may need to be cleaned.

 

I had no fuel leaks to ~65psi at the FPR. That said, I think the whole thing was jury rigged, and it's a miracle it didn't fail. I'll be replacing the 680s with 850s anyway, but I still need the info on the 1600s. Carl. BTW, are those spacers at the bottom of the injctor normal for this application?. Carl

 

The one pictured that is crushed is not meant to be used on the bottom of the injector. You need the one at the bottom of the 1600s to help them seat into the injector holes. I believe the proper way to have the injectors setup is from top to bottom is small oring on the top in the groove (helps hold the injector in the rail) a few mm below that the grommet that has flared lips (seat/seal the injector to the rail) and the on the bottom of the injector the rubber spacer/grommet that has beveled edges (to seat/seal injector to the injector holes).

 

Thanks, Still trying to ID the "1600s", and is the stack on the primaries normsl, and are the 3 o rings on the 1600s correct, or jury rig? I guess I'll forward this as a PM to all the "ALL KNOWING "

 

up for the weekend crew, anyone know what the correct "O-Ring"/seal is where the thtree O rings are on my Blue top injectors?

 

Some people just use one; I like to use three stock o-rings.
I haven't come across a correct single seal to retrofit for this application that's available easily.
You can keep the fat o-ring that came with the original fuel injector, but you'll need to modify your fuel rail to accept it.
Paul Ko @ K2RD used to have the correct bit to handle this mod for Zenki cast aluminum fuel rails, but I think he sold all his vertical mill tooling.


-Ted

 

They look like fuel injectors if you want my opinion.

 

Do me a favor measure the resistance across those injectors.
Also is the number on the side 280 150 927 ?

 

number is 927 , does 5 ohms sound right?

 

Thanks Ted, so the three O rings has proved reliable?

 

Just be sure to lube them up well with some oil so they wont cause too much friction between them or pinch themselves.

 

Yea, I do not love the idea, as you can see in th epics both sets looked marginal, one looked like it was damaged on install, the other looked like pressures were starting to push the rings. There must be a better way to do this, maybe I'll go a custom rail, new 1600s, and sell these to someone who wants to use a stock rail. Carl

 

So far, four cars with this set-up and no leaks that I am aware of.
From your pic, it looks like the o-rings are twisted!
As recommended, I lube all fuel injector o-rings (usually with engine oil) and install them.
I then back them out to see if any had be damaged on the initial install, and if they all look good, put them back.


-Ted

 

Those secondaries are Bosch that look like the fuel inlets have been modified (cut away) to fit the smaller o-ring required for the fuel rail. Most folks just use one o-ring, but if 3 works that's good too.
5 ohms isn't common, except for some older Porches, and any number with a 927 in my database isn't close to the suspected flow and resistance.

If needed, my service will clean & flow test them and replace the parts for $12 ea.


Gordon
WitchHunter Performance

 

As a rank amatuer when it comes to electrical, I set my multi meter on 200 ohms is this the correct setting? What effect will the 5 ohm injectors have on the system? I measured the injectors Id' as stock GSL SE injectors, and they were 2.5 ohms, I also measured some seimens 850cc 3105s, and they measure 2.8, sound right? Could the guy that installed these have put so as to change the resistance to a proper value? I think Enzo had a line on what the blue tops were, as he asked if they had the #927 on them. Carl

 

Gordon, I checked your site, I may be measuring incorrectly, I was using the two electrical contacts, is that the correct way to measure?

 

BTW, I will contact you, and send my injectors to you monday. Thanks