routing the ast like this is acceptable? would something like this work with an aftermarket ast that has the nipples in the stock location rather than next to each other?



the re-a ast has a second bung. i would imagine that it was threaded. drilling a hole through it and adding a triple t fitting to run the bottom nipple up to the second fitting on the side would achieve the same goal i would think

http://www.upgarage.com/upgarage/sto...1302000296/302

 

That's just dumb how that's plumbed. Don't see any good reason for it.

Again, this is something that isn't broke and doesn't need fixing. Either eliminate the AST or run it as usual, there's your 2 options.

Dale

 

i dont understand... whats dumb about it? would a set-up like this cause the overflow to get full faster considering the radiator is bypassed?

 

There's a hose going from the side of the AST to the overflow nipple on the water neck. Makes no damn sense. I don't see a hose going to the radiator at all, but it could be hidden.

That's not an RE-Amemiya AST, I think that's the Greddy universal AST that's primarily made for Subarus.

It just doesn't make any sense. You have hoses just going back and forth from the stock water neck, I don't see it accomplishing anything.

Dale

 

^if you look closely you can see a glimpse of a line heading down from the bottom I think. Even then it still has too much going on. pressure cap on the filler neck and say as well.

 

please dont be confused as to thinking this is my car..... its not. its a picture i was using as a reference to get help with my question...

also, i know its not the re-a ast, i posted a link to it. also using that as a reference to getting an answer to my question.

but, disregard.... this works for the person that did it, because he did it. so there must be some reason for it.

 

Or they have no clue how the stock system works.



John

 

its the ebay ast. (ebay ast has three ports in the cylinder wall, one on the bottom, and one for the cap. the lower four are 1/8 npt)

there are enough ports on the ebay ast to run all the stock hoses. i would put it in stock location and use stock routing.

theres no need for two hoses from the water neck. in fact, ive never seen that black part on the stock water neck.

bad routing in picture provided. assuming there is no hose coming out the bottom. why have two pressure caps? Dale's right, nothing is accomplished by routing it that way.

 

I don't see that routing directly hurting anything (as long as there is a port on the bottom going to the radiator and the filler neck cap is a factory FD cap), but I also see no point in doing it...just a waste of space and gives extra potential failure points. The two ports on the side of the AST going to the filler neck are both serving the exact same purpose.

 

is this also pointless if the aftermarket radiator has no nipple for the ast but the user would like to keep the ast?

 

No, you could put a temp sender adapter in line with lower Rad hose and run the ast bottom hose down there.

 

OK I can agree with this rationale as long as one of those potential reasons is being stupid.
Yes. For the reasons already stated. The owner of that car already has an S5 filler neck on it. That tells me they know that AST is worthless. And that means there's just alot of useless plumbing going on with unnecessary potential failure points...just so they can maintain a little bling.

 

ASTs help keep the system air free, they are not useless, but a car can definitely be run without one.

I used to have it deleted (and the car functioned fine) but then converted to a custom one for ease of filling and the piece of mind of keeping the system bubble free.

The proper way to route an AST is to have two ports for coolant flow from the highest point on the engine and the highest point on the radiator (the most likely place for bubbles to collect). The ports on the AST connecting to these sources should be higher up than the sources so that the bubble go to the AST. I'm using -4AN lines for this.

Then you obviously need a port for the overflow line that is above the bottom of the pressure cap when the system has no pressure (but below the bottom of the cap when the system does have pressure)

And then you also should have a return at the bottom of the AST, I have this line (-10AN) running to the bottom of the radiator.