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View Full Version : Can I use this coolant crossover pipe?



redline380
01-13-2015, 03:38 PM
So, A4Rob is switching to a different setup and I bought his custom coolant crossover pipe which sits below the intake manifold instead of on top. This thing is far from factory, but should look a ton better. The problem is if I can get it to work on my setup. He had it on his 058 blocked car, I am putting it on my 06a if it matters.

The flange is a metal flange from a 2.7, bolts right up, so no problem there. Next is the line that runs to the heater core. He had a silicone tee in the line and two way male barb fitting connecting the line to the pipe, so I can make that work no problem as well. As you can see, he was running a AN fitting for the coolant overflow. I will be using a stock reservoir, so with a combination of line and fittings, I should be able to make that work no problem either.

Where I do run into a problem the line that runs from the oil cooler to the original crossover pipe. There is no fitting on his pipe for the line. I texted him and he didn't really understand my dilemma over text, but said he was running a -3 AN line from his cooler to the turbo. So, my main question here, is if I can run a line directly from the oil cooler straight to the turbo? My obvious concern is that the line going from the cooler to the original crossover pipe is around 3/4 inch, while the coolant inlet to the turbo is less than 1/2 inch. Will this reduce coolant flow through the oil cooler, thus increasing oil temps?

Another, smaller issue, is hooking the other end of his pipe up to my radiator. I don't see a huge problem here as the right amount of hose bends and barb fittings should make it work no problem.

I am completely open to ideas because I would like to make this work.


http://i696.photobucket.com/albums/vv328/redline380/WP_000431_zpsa545d258.jpg
http://i696.photobucket.com/albums/vv328/redline380/temporary_zps70b2a81b.jpg
http://i696.photobucket.com/albums/vv328/redline380/temporary_zpse50ca54e.jpg

A4Rob
01-13-2015, 04:49 PM
Lucas,

Take your stock rubber upper coolant hose and use that so it utilizes the stock clip. Use a union joiner for the heater core hose. I pointed that out in my garage.

redline380
01-13-2015, 05:13 PM
Lucas,

Take your stock rubber upper coolant hose and use that so it utilizes the stock clip.

Well, it wont be completely that easy since it would kink. But I can make that part work no problem.


Use a union joiner for the heater core hose. I pointed that out in my garage.

That part I have covered as shown in this picture.


http://i696.photobucket.com/albums/vv328/redline380/temporary_zps04543acc.jpg






The part I am stumped on is the hose that runs from the oil cooler to the stock coolant crossover pipe. Not sure how they are on 058 engines, but on 06a block motors the oil cooler draws coolant out of the crossover pipe and goes back into the other hard coolant line that runs to the water pump.

My question is since the the turbo takes coolant from the block and returns it to the stock coolant crossover pipe, instead of putting it back into the crossover pipe, if I can just pump it directly into the oil cooler? Heres by best effort at a drawing-



http://i696.photobucket.com/albums/vv328/redline380/old_zps8e92c989.png
http://i696.photobucket.com/albums/vv328/redline380/New_zpse0ee21e7.png

redline380
01-13-2015, 05:20 PM
My question is since the the turbo takes coolant from the block and returns it to the stock coolant crossover pipe, instead of putting it back into the crossover pipe, if I can just pump it directly into the oil cooler?

I would like to clarify that if I ran it this way, the only coolant the oil cooler would use would come through the turbo. Is there enough coolant flow from the turbo to supply the oil cooler?

chris164935
01-14-2015, 12:16 AM
It would be hot coolant, making the oil cooler useless. The coolant from the turbo is fed into the crossover pipe near the top of the radiator. It merges with that hot coolant and flows into the radiator to be "cooled down". On the 06A block, there is a hard pipe that comes of the side of the block near the thermostat. The heater core gets hot coolant from the head and then feeds that to this hard pipe (it is cooled in a sense because the heater core is a radiator). This is where the oil cooler gets it "cold" coolant to effectively maintain oil temps. Everything that connects to the crossover pipe above the intake manifold should feed hot coolant into that crossover pipe (except the overflow hose that goes to the reservoir, which I don't think will really help you since you are relocating the crossover pipe to a lower location) so that the hot coolant can be fed into the radiator to be "cooled down". What you want to do would take hot coolant from the turbo and use it for the oil cooler and then mix that hot coolant with the coolant that has been "cooled" by the heater core and then mix that with the coolant that is "cooled" by the radiator at the thermostat.

I modified your image to show how the stock setup is.
http://i49.photobucket.com/albums/f260/chris164935/old_zps9ab098dd.png

A1 A2 German
01-14-2015, 12:21 AM
I'm going to be making and selling a few of these, but much much cleaner. Fully under the manifold so you never ever have to break open your coolant system when you remove the intake manifold. With modern unions, updated Audi parts, and look better then oem. Been running it ~3 years in the hottest state in the country.

Wednesday if I have a second I'll give you a lay out and luk the general pattern and what goes where.

redline380
01-14-2015, 08:36 AM
It would be hot coolant, making the oil cooler useless. The coolant from the turbo is fed into the crossover pipe near the top of the radiator. It merges with that hot coolant and flows into the radiator to be "cooled down". On the 06A block, there is a hard pipe that comes of the side of the block near the thermostat. The heater core gets hot coolant from the head and then feeds that to this hard pipe (it is cooled in a sense because the heater core is a radiator). This is where the oil cooler gets it "cold" coolant to effectively maintain oil temps. Everything that connects to the crossover pipe above the intake manifold should feed hot coolant into that crossover pipe (except the overflow hose that goes to the reservoir, which I don't think will really help you since you are relocating the crossover pipe to a lower location) so that the hot coolant can be fed into the radiator to be "cooled down". What you want to do would take hot coolant from the turbo and use it for the oil cooler and then mix that hot coolant with the coolant that has been "cooled" by the heater core and then mix that with the coolant that is "cooled" by the radiator at the thermostat.

Yeah, I get what you are saying. That was my question is if the coolant from the turbo would be good enough for the oil cooler. Looks like if I want to run this system I will need two additional bungs welded on- an outlet for the oil cooler and a inlet from the turbo. I mean I could just delete the heater core since I do not use the car I the winter, but I would like to keep it for coolant bleeding and to ensure the coolant system is operating fine.

redline380
01-14-2015, 01:11 PM
Well I went and bought some stuff today to try and retrofit this thing into my car.



Picture of what it would look like with the manifold on-

http://i696.photobucket.com/albums/vv328/redline380/1f137b56-46bb-442b-b940-31f95d315c52_zps245e163e.jpg





Without the manifold-


http://i696.photobucket.com/albums/vv328/redline380/temporary_zpsfb3f91ce.jpg




This is the most concerning bit so far. I could not use the stock hose fitting on the stock radiator. However, the hose that is on there fits on the lip great. I put a hose clamp around the hose and it cinched pretty tight, I couldn't pull it off. Whether this is a long term solution is yet to be discovered, but I am will to try it.



http://i696.photobucket.com/albums/vv328/redline380/temporary_zps27075c4f.jpg





I bought these two pieces today. One is a 3/4 stainless barb fitting which will have to get tigged on to the pipe to supply the oil cooler, the other is a 3/8 npt stainless union. I will chop the threads off of one half and tig it on the pipe to allow the turbo to dump coolant back into the system.



http://i696.photobucket.com/albums/vv328/redline380/temporary_zps9fe19931.jpg
http://i696.photobucket.com/albums/vv328/redline380/temporary_zpscc84e73d.jpg
http://i696.photobucket.com/albums/vv328/redline380/temporary_zps8cb21cd9.jpg

redline380
01-16-2015, 04:45 PM
I came back to St. Cloud for the weekend. Stopped at the diesel shop and no one was around to weld for me until my buddy showed. However, no argon :'( I had to make the trek to Foley and went to some guys shop who used to work at the other diesel place. Turns out, this guy has a pretty cool operation outside of town. When I stopped by, he was making cribbage boards on his CNC machine. About an hour later, he had my fittings tigged on for me. Not the cleanest job, but I am bound and determined to make this pipe work.

Link to the cribbage boards. Pretty cool looking- http://www.amazon.com/Anodized-Track-Aluminum-Cribbage-Storage/dp/B00LHHEVPA/ref=cm_cr_pr_pb_t


http://i696.photobucket.com/albums/vv328/redline380/temporary_zps247d7d2e.jpg
http://i696.photobucket.com/albums/vv328/redline380/temporary_zpsb2a2ee1a.jpg