Hey, im in automotive technology and we were studying ways to clean injectors..Theres a method where you use this cleaner that hooks up to the fuel rail, and you just loop the fuel feed and return lines. You set the specified PSI for the cleaner to the injectors, turn the car on, and it runs off the cleaner instead of gas, until the can of cleaner is empty and the car just dies..

Now my question is..would this be a good idea for rotaries? It doesnt seem like it'd work because the secondary injectors come on at 3800 rpm...so youd only be able to clean the primaries without revving the engine for 10 mins til the bottle is gone...And would it be safe to use it?
I forget what the thing is called that you clean the injectors with, its some model number or something..

Anyways, it seems to work great on reciprocating engines, but im really nervous about doing things to my car.
I got some T2 injectors for my turbo project, and i want to clean the injectors first, and i can do it for free this way since im in the class, but i dont want to do it if its not safe.. i WOULD ask my instructor (who is pretty smart) but i think it'd be useless because he doesnt own and RX7 and i dont believe he's ever worked on them

 

You could swap the primaries and secondarys after cleaning one set.

 

Two shots of injector cleaner on a quarter tank of gas.
Then go for a really fun drive.

If that dosen't help, then they should go to an injector cleaning service

 

"injector cleaner" theres so many kinds of injector cleaner...what kind are you referring to? I know theres some really shitty ones out there, and some factory quality stuff to. The only really good stuff i know about is in a pressurized can

 

redline's fuel injector cleaner seems to be good stuff, as does chevron's techron (i use the techron, not the chevron fuel injector cleaner w/techron)

 

Wal-Mart has two generic types.
I wouldn't call the 78 cent stuff shitty - just weak/lame.
The $1.49 Wal-Mart "concentrate" is pretty close to the good stuff for way less cash.

Two bottles in a quarter tank gives 8X strength, which gives it a chance to actually help.

If that dosen't do it, then it's not likely any "in the fuel" system will.

 

yeah i agree about the strength and have heard the same from others. in general i get a treatment for like 15-20 gallons, and i put it in when i'm at like a quarter tank of gas. i do this like once every 1-2 oil changes, so maybe like every 5,000 miles-ish.

 

if you put that in with such low gas mixture, its not going to eat away the rubber fuel hoses is it?

 

it hasn't yet...that's not the best answer i guess heheh. i know others who use concentrated mixtures the same way and i have done this every few thousand miles since i bought the car 25,000 miles ago without losing any fuel hoses.

 

Does it affect premix?

 

By far, the most effective way I have seen injectors cleaned is ultrasonically. This is what most injection shops will do. Chemical cleanings also have issues with the RX-7, because of the secondary injectors...If you're going to swap injectors after/before a cleaning, you might as well just send them to an injection shop and have it done properly.

I am always wary of checmical cleaners, since most of the just contain a few more ounces of chemicals already in gasoline.

 

Wah, ok i wanted to avoid doing this as i see it as unnecesarily spendy, but i guess it cant be helped... I dont relaly like the idea of shipping my injectors out, and my local shops charge out the ***. I gues ill end up sendin 'em out.
Thx for all the helpful replies.

 

Seriously.
You can't beat ultrasonic.

Any "Fuel cleaner" bought over the counter is a placibo(sp?).
It doesn't do anything.

The industry ones are ok but still. You just running some harsh chemicals through your ENTIRE fuel system(most of the time unless it's direct fuel rail) which has to be pretty hardcore to do anything. Fuel is in the rail for a short amount of time.
It's pushed in the rail and then shot out through the injector.

Would you rather have an hour long sonic dip or a couple thousand millisecond dips?

Bah. Besides. When you send it to the cleaning shops they also replace pintle caps and filters and give you flow tests before and after.

 

we have a $1700 ultrasonic machine at work that we use to clean jewelry with. it works very well, however i'm not sure if its meant to clean injectors. i figure an ultrasonic cleaner is an ultrasonic cleaner so it will help pretty much. i've been meaning to try it out.

 

Here is a link. They charge $12 per injector. Follow the link and it'll tell you what's included and the procedure for shipping. If you email Rich, he replies quickly and answers questions. I haven't read anything negative about them.
http://www.cruzinperformance.com/

 

dont you think that they would be pissed if you but old greasy and gasoline filled injectors into a machine that they use to clean jewlery

 

You really should take them out and send them to a place like RC engineering. Since the injectors are exposed to so much heat under the intake manifold the tips varnish pretty easily. I have heard you should get them cleaned professionally every 80,000 miles.

 

well usually its one guy there at a time and no one would really know, the machine gets cleaned out daily, usually by me.

 

I use this stuff called "Seafoam" and it comes in a can that you pour into your gas tank and it works wonders. You can put it into your tranny and oil too. It's really awesome and it's fairly cheap too. Like $4 or $5 a can.

 

We are local (Bothell) and charge $12 each....
I felt the same as you do, that's why I started the business.

Gordon
WitchHunter Performance