So I had the injectors out, and wanna clean. but i'm broke as a joke. so i dip the injectors in MMO (already had some) for like 2 hours. Then got some injector cleaner (redline) and dipped in for another 2 hours. While there dipping I just open and close them hella times (hook up a batt and switch, then turn on/off really fast) also I made a funnel to go ontop of the injector with fuel injector cleaner in it, and pulsed the injector until all the cleaner went thru it. what i noticed is that the secondary injectors flow faster than the primaries. are my primaries really dirty, or is it jus normal. any help greatly appreciated.

 

I think the primary has about 1/2 the flow as the secondary.

 

Uhh.. no.... all the injectors are the same.
It's only logical that the primaries would be more gummed up than the secondaries- since they get used 100% of the times, while the secondaries are only online above 3800 rpms.....

That's pretty much how I cleaned mine (BTW, you can use as little as 1.5-2v to open the injectors, so you don't have to worry about frying them if held open with a full 12v for more than 10 sec....

It will clear out the gum, but there is no substitute for the ultrasonic cleaning that professional places do (eg: RC engineering) to totally clean them.

 

I have an ultrasonic cleaner for my watch parts, is that the same thing? I alsoc lean like rings and **** like that in it. Dose anyone know what chemical they use?

 

Yep... same thing- I would love to be able to use one of those!
The chemical is probably just a regular cleaner/degreaser.. like carb cleaner or something.
I don't know how long they need though... I would also make sure you keep the injectors opening while it's in the solution.

 

Chrysler has an aerosol cleaner that they use on their enignes. I saw it done on TV once. They disconnected a vacuum line that shut off the fuel pump and connected the aerosol can to the injection rack. The can comes with a lockable nozzle. They began cranking the engine and locked open the nozzle on the can. They ran the engine until it ran out of fuel and just put everything back in place.
When they restarted the engine, it ran MUCH better. Has anyone else seen this procedure? Anyone think that it could be used on an RX7?
It sure beats pulling the injectors and would allow the injectors to be cleaned on a regular basis.

 

Um I dont think so. If I were an injector I would want to function all the time. Assuming the gas lines are all clean and theres no foreign material in any liquid gas... the secondaries would clog from not being used as much.

 

yea thas what i'm saying, cuz there all 550cc x 4. jus wondering what would happen if i switched the primaries to secondaries. would it make me run rich down low and lean up top?