well s5 cars dont have to worry about carbon in the intakes as much because the dont have egr valves. my personal favorite place for doing the water/CC trick trough is the injector bleed sockets. when i removed my emmisions i hooked all 3 up to 1 tee connection so i just unhook that line from the back of the tb, add on an extra hose, stick that in the jug of water, and TADA, perfectly even water disrobution.

 

I do agree that carbon is present in the exhaust. What density and of what average size I don't know. And I'll agree that it's likely that some of the particulate gets dumped back into the motor via the EGR valve. But that's my speculation - I've never read comments about it and have zero information on it.

What I have difficulty agreeing with is that any of this 'recirculated' carbon subsequently becomes the 'baked-on' carbon that the CC and water tricks are seeking to remove. But that's specualtion, too.

Will I retract it? Not yet. I would like to see what someone who is more knowledgeable on the topic has to say. I know that I'm not that guy.

And, regardless, aren't we kinda splitting hairs now?

 

Its not a myth. Get a used rotor with carbon on it and pour some ATF on the rotor. Let it sit and then scrub the carbon off... tell me your results......=)

 

I'll tell you some results about ATF!

I let an engine sit for a whole year totally filled up with ATF, literally.

When I finally tore it down there was still carbon caked onto the rotor surfaces, and it didn't come off until I took to it with a wire brush.

HOWEVER, the soft seals were all still in perfect condition..

Also, I tore down my other engine pretty recently that had been running on premix, no carbon caked onto the rotors. They were shiny on half of the surface and a _very_ light layer of carbon on the other surface, that would just wipe off with some thinners.

So thats all I have to share about ATF.
Basically it does sweet F A.

 

That's the key right there. Agitation. Just soaking in ATF does nothing. ATF is an amazing lubricant, but as an 'active' cleaning agent it's a total failure.

Sure you can dump ATF into a motor, but after that how do you plan on scrubbing the surfaces?

 

atf will loosen the carbon. Combustion will "scrub" the carbon off.

 

Man, how'd this thread come back from the dead!!

 

it proves that newbies searched

 

Just using water is the safe bet. This amsoil power foam stuff does interest me though... must search...!

 

Amsoil Power Foam

 

WOW, it really did come back from the dead, about 2 years ago dead

 

is the top hose that is kind of big directly below the green arrow the hose you use to do this for the front rotor and the boost pressure sensor line for the back rotor?

 

Do you think running CC through your engine would Foul up your plugs?? i know the atf trick does, so i dont see why carb cleaner woudlnt... there has been much more research done about the atf trick, and it works great... i havent even done it but would do it over CC anyday.. just because i know what to expect in the long run..

 

How's this for research?

https://www.rx7club.com/showthread.p...hreadid=251048

 

You use the line I've circled and traced in red. This one line will deliver the CC to both rotors. It goes to all four of your OMP injectors.

 

my supra manifold and every DSM manifold ive gotten my hands on... like 10-ish... have had a good 1-2mm of carbon caked up inside the runners. the only things that pass thru there (before the fuel injectors) are Air, oil vapors from the PCV (always routed into the air intake duct on turbo cars, pre-turbo) and exhaust from the EGR system. any time there is vaccum, the EGR is open. when there is no vaccum, like heavy accel, the EGR is closed. 98% of hte time, we spend under vaccum. then, the oil vapors condense on the intake walls and act as a tack for the carbon particulate and adhere to the walls.. and it just builds layers and layers. on a 120k mile motor, i wouldnt be surprised to see 2mm of carbon/oil cake on the walls.

the water trick wont get rid of the crap inside the intake, neither will the ATF trick. Sea foam might, never tried it. Carb Cleaner most definitly would. in fact, thats what i use to clean my parts when i tear down motors. but instead of waiting for everything to dissolve, i help it along w/ a nylon bristle brush. i prefer brake cleaner mostly though, leaves no residue. almost straight Xylene/Toluene. the do have a high volatility and evaporate quickly, so its easy to go thru many cans in one sitting. but the **** works SOooo well!

for removing stubborn carbon buildup inside your intakes, use the carb or TB cleaner sprayed into the vaccum hose. for stubborn carbon buildup inside your rotor housings, use water. if you have eons to wait for ATF to breakdown the hydrocarbon links of the gums and varnishes inside your engine, by all means, entertain yourself. if your engine is apart, blast that **** w/ brake cleaner and the Red straw. it will literally blast the carbon and stuff off the surface. or, get a couple gallons of Carb cleaner from Napa, and sit your parts in there overnight. when you come back in the morning, they will be good as new, no scrubbing, no buffing!

oh,and i ALWAYS search cuz im quite the Noob. check my registration date! im just a green horn

 

Then check *my* reg date.


You're just not whoring enough.

 

Just putting in my 2 cents. After reading these posts on carbon buildup and removal I went to the local auto parts store and got some fuel system cleaner by Valvoline and some marvel mystery oil. I am using the fuel system cleaner now.
I also found some stuff in a little red plastic bottle called RXP. Its 2.5 oz. and says it is for removing carbon from combustion chambers. Has anyone seen this stuff and used it in your engine?

 

My mechanic friend told me most engine cleaners are basically relabled ATF :conf:

 

I know for a fact that none of the engine cleaners i've seen or used are ATF, most engine cleaners that say they are made to clean the inside of a motor work quite well i gained alot of compression and much smoother running after using a can of amsiol power foam

 

just curious with this thread do the s5 engines have those lines in the back of the intake/throttle spot, i dont know what to call it. just a thought.

 

I know my S5 doesn't. I'm not sure where the vacuum line for this is on the S5. Thats why i blew mine right into the intake. It didn't really do anything I don't think. It seems like in every description so far they have explained where the vac line is on the s4.

 

I did the water trick today.

It is definitely smoother, idling, driving. It probably did add horsepower, only the track will tell.

3 gallons of distilled water.

What WAS a huge pain was the vacuum hose. I had to pour the water in a small cup and keep going back and forward while my brother pushed the gas. I HIGHLY suggest getting a hose so you can stick it in the gallon of water.

 

This is/was one of the best threads ever I must say. I forgot to say that I tried the Carb Cleaner through the hose that Amur pointed to above about 3 months or so ago...maybe more. It worked WONDERS...it's ******* amazing I'm so used to breaking an engine down and cleaning it that it never really donned on me to try something like this and do it the quick way. This is one of the best things I personally believe you could do to an engine (even as a tune-up item...it should be a requirement). I've had no adverse effects to this (I did it on Fieldyz FC...the multicolored beast ) and it worked like a charm man. The idle was great afterwards, the tips (exhaust backboxes), the car was VERY noticeably stronger and smoother. The smoke coming out of the car wasn't too bad (don't do this if you have not so kind neighbors though . I had to get him to hold it @4k or so of course to keep the car from stalling. But in short...this is probably one of the best things...no wait it IS one of the best things we could've ever done to his car. When I finish putting mine back together I'm gonna do the samething (if I don't just break it down all the way and clean it...hell I'm "halfway" there now, you never know). Bottom line pull off the damn hose that Amur showed you and do it if you want to know how good it REALLY IS, it's more than worth it.

Kiyo

 

Carb/Choke Cleaner today, My idle was already smoth but it feels like its a bit more responsive, i could tell a difference, recommended