I've been wanting to do this for a while and have been looking through a bunch of old threads which got me thinking, bad thing a times.

I see a lot of it about 3rd gens and TII's but not much about S4 NA's. I'm trying to figure out what lines to tee into, I know RotaryRessurection mentions 2 nipples about S5's though there isn't really a picture and I don't know if the manifolds are the same. What I'm wondering is if it is the two really close together on the LIM? What size would those nipples be as well? I'm thinking 3/16", but want to make sure.

Also, I've read that people do this while idling in their driveway or wherever, and don't recommend doing it while driving. On my commute I have a back road that's a pretty steep downgrade for about 1 1/2 miles and was wondering if I just dropped down a gear or two and did it by running a vac line into the car and having the water inside, would that work? Along those lines, would it be safe leaving those two vac lines off the nipples, again if those are the correct nipples?

Finally, I've read that most people change their oil right after doing this because of dilution and such, but wouldn't a hot engine vaporize the water in the oil and send it out the tailpipe, assuming with a working PCV system?

 

Nobody?

 

I did this on my S4 NA. Not sure I saw any change, but it made me feel better. I did change the oil right after just in case. It is drinking a good amount of water at a fast pace. I held the throttle up at around 3k RPMs while dipping it in a 2 liter bottle of water, i'd let it suck some and then take it back out, then put it back in a second or two later. I used one of the nipples at the top of the UIM. I believe I used one of the smaller ones in fear the larger would drink the fuel too quickly.

 

i do 1 rotor at a time so that the one rotor can carry the other and not labor the engine too much.

S4 has 2 capped nipples facing up just under the throttle body, i use those ports.

i don't notice much if any oil dillution so usually i just leave it alone and haven't noticed adverse affects unless it is time for an oil change anyways.

 

Thanks guys, never really paid attention to the insides of the manifolds while everything was apart but are those two nipples separated all the way down the runners, or do the runners merge lower down? I'm assuming separated since you said one rotor at a time.

Also, I was just planing on doing both at once with a tee driving down that big hill and pulling the hose out of the water or pinching it with some rubber nose vice grips when I get to the bottom, but that leads me to the other question, would it be safe long enough to run those two hoses off/plugging them temporarily.

Now that I just went out and looked and snapped a few pics, I'm assuming you meant the first one and corresponding other one that I could not get a pic of and not the second which I was thinking.

 

the 2 capped ports do not merge, they go into the primary runner for each rotor.

 

Do people seriously do this while trying to drive the car? I've just done it while idling the engine & giving it a little throttle to prevent stalling. It smokes up the block, but oh well!

 

Rocket, I wouldn't dare try this on some populated road. There's just some pretty deserted steep back road in the middle of this sea of corn here in SW IA that's a tiny detour from my daily commute route and I figured what the hell I could pop it down a gear or two and be off throttle for max vacuum so it should go rather quickly and I won't have to worry about stalling out.

RotaryEvolution, arg so used to calling you Karack, so am I right in thinking that you meant the ports from my first picture and not my second?

 

sure, it's called AI.

but water shouldn't cause any smoke, some people prefer seafoam but i doubt there is much of a difference.

i wouldn't recommend driving the car with unmetered amounts of liquid entering the manifold.

 

I wasn't gonna drive that way. Just tee into those two caps and run a line into the car and plug it somehow when I'm driving and then when I hit the top of that hill drop it in the water and just coast down the hill in like 3rd gear for max vacuum and then when I got near the bottom plug or pinch off the line again, so as not to have a vac leak, and continue on my way.

From what you guys have said about water not harming anything, I don't foresee any problems with that method. Do you guys?

 

Why don't you just do it with the car sitting in one place? If the engine stalls on the way down your hill, you'll get to mash the brake pedal since the booster won't work.

Hah. AI is one thing (I just finished my AI setup), but sucking in large amounts of water through an intake port is not going to make the coils happy.

I don't think there are any ports that lead directly to one rotor or the other on TIIs, so when I did this it was going into both rotors and making it run really rough. I'm assuming the smoking was due to unburnt fuel ending up in the exhaust. It made a nice big cloud.

 

map port and the air bypass valve(blowoff valve) lead to separate rotors.

 

Eh, if it stalls it's not like I can't pull the hose out and pop start it again, been having to do that a lot recently as I've been getting stalls more and more frequently, but I'm thinking my regulator is going out on my Taurus junkyard alt cuz i'll drop down to battery voltage just cruising sometimes.

 

Where are the nipples located? My setup no longer has stock vac routing.

 

here is what i think, your roll down the hill technique could work. and as far as i know at this point in my rotory class, you cant hydrolock these things so it should be safe. maybe i dont know. i see what your trying to accomplish you want to force the water through which is a good idea but i would do what everyone else says and do it in a metered environment not out on the road., but its up to you so do what you gotta do.

 

there's no real benefit either. having enough vacuum isn't a problem. try it in the driveway, its simple.

 

Where would one tap into a S5 NA to do this?

 

In for learning.