SBi_Owner

I was reading about running water through the engine to break up carbon and clean the engine. Well, I set up a bottle of water and a valve in the line and let it fly....

After about 1/4 gallon, I noticed an awesome difference in engine responce. I wonder if anyone has tried this and if you saw any gain in performance? I also would like to know how often should you do this?

RX7WEEE

iTrader: (16)

how much water did you let in when u where putting water into your engine? a drop at a time? a small stream?
i would like to try this.

could u give us more info on exactly how u did this thanks.

Godzilla-T78

eh........

cloud9

iTrader: (4)

I wouldn't mess around with dumping random amounts of extra variables (water) into my motor, I think water injection is a good idea and I want to try it eventually, but I will definitely be going with a computer/pump controlled setup

SBi_Owner

I actually used a metering valve in the line hooked to the UIM. It used about 1/4 gallon in about 2 minutes. I was unsure about how much to use, but it seemed to be right. You also need the engine banked to about 3500 rpm while doing it. I also noticed the low end misfire, or so I thought, was gone. I just took the car out again after it cooled down, it ran like a champ. I also noticed the exhaust getting a little toasty so do this at your own risk.

SBi_Owner

This was actually just a trial run on removing carbon buildup from the engine.

RX7WEEE

iTrader: (16)

so the exhaust isn't getting any hotter?

where did u get this info to do this?

my motor has a bunch of miles on it(120k) so i really dont care about it. so i might try it.

SBi_Owner

It just got hot while adding the water.

I just heard it through the grape vine and decided to give it a try. I also remember seeing a thread on it but I don't recall an exact procedure. Thats why I didn't just want to dump lots of water in the engine at one time. I might need to do it again, but for now, I'm happy with the results.

RX-187

That's w/ the original engine?

Rated R1

There are several threads in the first gen section that discuss carbon removal using various methods.

Enthu

iTrader: (1)

I did the Sea Foam Deep Creep method on my FC> I would have tried it on my FD, but the engine is already toast,so no point.

It seemed to increase the responsiveness of my FC. When I did it I just unhooked the brake bosster vac line and stuck the sea foam straw in. just had to hold the revs up to keep it from stalling.

6k miles later i've had no ill effects from this.

InsaneGideon

On the Miata list a few years ago, I remember people speaking of a Mazda de-carbonizing agent that was applied the same way. It was supposedly available at dealerships.

I never tried it myself. It may have just been a $10 bottle of distilled water and a vaccuum hose.

CYM TKT

iTrader: (4)

when I did this my exhaust got very hot. be careful or your exhaust just might catch your bumper on fire....

teamstealth

Interesting approach to removing carbon! I just use a bottle of Techron fuel system cleaner every 3 months or so...hear that cleans off carbon ok. However, i am working on my own WI kit, so i guess another benefit will be steam cleaning

RotorJoe

Interesting??? I will have to remember this. Does anyone have the link to the procedure?

Str8Down

Or you could just pour AT fluid into the LIM for each rotor. Let it sit overnight, then pull the plugs and turn the engine over a few times. Put plugs back in, carbon all gone.

Mahjik

iTrader: (1)

https://www.rx7club.com/showthread.p...threadid=42318

mad_7tist

it is an old school trick. would help if deposits were forming on the top of the valves and affecting their sealing. it does clean realy well. as long as you dont hydo-lock it...

yzf-r1

iTrader: (1)

sounds like a great way to cause more damage to your engine than any carbon deposits will

run a good syntheitc oil and change it frequently....hands down the best way to keep your engine internals "clean"

RotorJoe

Thanks for the link

sub9lulu

iTrader: (7)

thought u can't hydrolock a rotary

RX7WEEE

iTrader: (16)

yeah thats right i got 120k on the motor with 105psi in both rotors

i tryed this water thing it worked well. i had a tiny bit of breakup at 7-8k but now thats gone
(cleaned the sparkplugs im gusseing)

engine was smoother also.

SBi_Owner

Don't get me wrong, I'm not using this in exchange for not keeping up on the engine. I'm lloking at this as a maintenance item such as plugs, oil, filters and so on. This is not intended as a shortcut.

InsaneGideon

Here's what I mentioned before, concerning the Miata. Apparently it's more than water. Maybe ATF?

http://www.miata.net/garage/tsb/s004_93.html

SBi_Owner

Yea, ATF is good but to restore and clean well, you use MMO. The problem with ATF and MMO is the plumes of black smoke from the exhaust. Well, that may be no different than some of the 7's out there.