I know there was a thread concerning the water traetment instead of the ATF for an engine cleaning.

I remember something about a dynamic chamber of sorts. Anyway, where can I attach the water receptacle, what vacum hose to use for sucking up the water.

Also, how long should I run the engine, at what RPM levels, how much water. Any questions you might want to add. My compression is still 7.0 to 7.1 on all rotor faces, but I want to see if I can raise that to determine the health of my engine. Thanks

 

https://www.rx7club.com/showthread.p...ighlight=water

https://www.rx7club.com/showthread.p...ighlight=water

 

mahjik jr. to the rescue....or would that be senior

 

The information is good, but inconclusive. Some people added a cup of water, some a gallon, some 1-4 gallon, etc. No mention as to how much water over what period of time or what precise vacum line to use. I see one vacum line that is used for the boost gaugue, will that work?

 

The Fd UIM has two nipples in the primary runners. I usually hook up a vacuum line to each one and use 1 liter of water per runner. When it's emply, I refill my container and then hook up to the other one.

 

one word of advise guys. . . its wise to not "dump" the water in the engine. let it go in in short bursts. having that much water going in there just might cause a problem. . . you dont want to wash the oil and such off of the surfaces that it needs to be on!!!

paul

 

distilled water only no?
the regular tap water have too much deposits no?

 

oh yeah. . . w/o a doubt!!!

paul

 

LOL Ouch, that hurts!

 

I cleaned the engine today. I disconnected the vacum line for the blowoff valve and suctioned through there. I used 500ml for that line. I then let the car idle ofr a few more minutes and I then used the line that is used for the boost gaugue. I also used 500ml in that side. I noticed that some carbon and water came out the exhaust, so it did work.


I reved the engine to around 3k and left it there while the water was washing the engine.

I can say that the car feels a bit smoother when I apply partial throttle. I did not feel any power gains, but overall I liked it.

Hope it helps anyone.

 

txturbogs: how long do you estimate it took for the engine to suck in each 500ml?

 

How much snake oil does it take to clean my engine. Where do I put it in?

Don't bother...

 

It took around 2 minutes tops. I did not count the time, but it was over pretty fast.

TurboJeff: What do you mean about snake oil?

 

Just floor it to 8k for a few runs in a row... that should clean it out. It's more fun than water cleaning too .

 

Seem like some don't feel water is washing it or does the job???

 

I saw a whole bunch of carbon deposits laying on the floor near the tailpipe, they were not big chunks, but small, wet, carbon pieces. I would imagine it worked just fine.

 

Does an "Italian" tune-up (running hard under load, like uphill) produce the same effect (blowing out the carbon build-up) ?

FWIW, I've done it to my Mopar 360ci V8 per my mechanic about 10-years ago, but I'm reluctant to do it on a rotary . . .

Also, I would think running a pre-mix about 5-miles prior would be best.

:-) neil

taken from:
http://www.rotaryresurrection.com/3r...injection.html

When talking about rotary engines, carbon buildup is a common problem brought up. I have a writeup elsewhere in the tech section of internal engine damage pics, showing the effects of carbon buildup. A good way to combat this harmful effect is to inject water into a running engine as a matter of maintenance (note that I am not referring to water injection as a method to assist tuning and combat detonation, but rather as a maintenance procedure). By allowing an idling engine to injest a small amount of water, it hits the rotor faces and turns to steam, cleaning off carbon as it does. The more regularly you perform the maintenance, the cleaner your engine will remain. The procedure (I believe) was originally brought to light by Rob @ Pineapple racing, so please note that I’m not trying to take credit for this, only spreading the information for use by individuals.

Note that this should in no way harm an engine in good health. Water doesn’t combust, but it doesn’t harm any internals or sensors such as plugs or 02 sensors either. The engine will misfire and stumble during the time water is injected, this is normal. You will have to apply throttle to keep the engine above 3000rpm during the injection.

To perform this, I use a gallon jug of water and a long vacuum hose, say 3 feet. Though this is different for nearly every year and model, the underlying goal is to find 1 or 2 vacuum nipples on the intake manifolds after throttle body, preferably on the lower intake manifold so that the water can run straight down into the block. You want to feed both front and rear rotors evenly…generally you have 4 intake runners, 2 for the front, 2 for the back. Some engines have one nipple that can feed both (s4 turbos, for example, have one above the BAC valve that is evenly split between F and R primary runners). Some engines (fd’s and s5 na’s for example) have 2 separate nipples that can be teed together externally (vacuum hose and tee) to evenly feed both rotors.

With the engine running, remove the vacuum cap or lines that used to cover the nipple you’re using. You might have to apply throttle, so the engine doesn’t die due to a vacuum leak. Insert your hose(s) onto the nipples, and bend the hose somewhere in the middle by hand so that it seals off the air intake. Now, dip the end of the hose into the water at the bottom of the jug. Either grab the throttle linkage and rev the engine up, or have an assistant hold the throttle for you, above 3500 or so. Release your crimp on the hose, letting the engine vacuum suck water in. The engine will begin to shake and misfire, apply throttle as necessary to hold 3-4krpm and keep the engine from dying.

Expect a lot of steam from the exhaust. This is normal. I let the engine drink the whole gallon at once. When it’s done, it’ll begin to clear up slowly, and you can gradually let off the throttle and replace the original vacuum hoses/caps.