I replaced my AST this morning and noticed a crack in the upper IC pipe where it mounts above the coolant fill neck.



Here is a closer view. The crack runs along the mounting tab and pipe body and continue down along the reinforced area for the mounting tab. I'm not sure if this is a full thickness crack or if the IC pipes are connected to the mounting tabs on the bottom and this really isn't a crack at all. Can anyone tell me? BTW, what is the common name for this particular IC pipe?

 

That's the crossover pipe for the Y-pipe. The latter RX7's had it changed to a metal pipe:

http://www.rx7store.net/product_p/efiniypipe.htm

 

Thanks. Damn that is expensive.

I'll have to look again but I seem to recall that the crossover pipe was a separate piece. I wonder if that can be replaced independently of the Y-pipe?

I'm surprised that the crack hasn't seemed to effect the car's running (at least that I can tell). But then I'm not sure when it cracked. I'll go drive it and see.

 

I'm sure Fritz Flynn has plenty of them laying around he would sell for a good price. However, the newer Y-pipe also has improved airflow characteristics which improves performance. Not to mention it removes the use of a coupler on the Y-pipe which is a failure point due to the extreme heat of the turbos. Plus, you could also polish it to make it look shiny:

https://www.rx7club.com/showpost.php...62&postcount=8



So, you could also look for a used newer y-pipe.

 

I do not think the pipe is cracked.I think it is the bracket cracking off the pipe--that is what happened to mine.

 

Yep, it's hard to tell without having it removed.

 

I don't think that's a crack, there's a groove in the pipe and it fits into the support brace. What I don't see is the top plastic part that goes over the pipe to secure it completely.

 

like others have said its just that brace thing, those are just snapped onto the crossover

 

That is what I was wondering. I'll take it apart and see what's up.

Maybe it is in the same place as my missing ABS heat shield. I wonder how many other pieces I'm missing that I never knew about? BTW, does anyone have a pic of the top plastic piece that secures it?

 

I have never seen such a piece.(ie it does not exist!)

 

This is the only picture I've got.

 

Yeah. I've not seen Jupiter's moon, Io, either, yet I'm convinced it really does exist.

That is good enough, thanks. It shows me what is missing. The only question would be how important is that at all? The crossover pipe sure doesn't look like it moves around at all. It was rock solid when I removed the lower IC hose from it this morning.

 

As you wish.There is none shown for example in the pictures in Yamaguchi's book and there is no such part shown in the Parts Manual.Let me know when you find a part no.

 

I'll concede that finding a part number for that would be tough. The more I look at it, the less it looks like it is necessary anyway.

 

never seen a top strap ever. and yeah neither are needed as far as i know. its probably snapped due to vibration from the engine anyway, better to just let it float.

 

There is no top piece to the crossover pipe. It does not exist. The pipe is held in place from the underside.

 

+1.
The strap pictured above is a fabricated piece, likely to cure the situation you have now. IF you need another, I can't imagine they'd be hard to find...and probably for not much more than shipping.

 

I got one if you want it

 

I was wondering about that. That was one of the things I asked in my first post:

Thanks for everyones help. I think I'll pull the crossover and take a look at how it is attached. Maybe once I get all the parts I've got laying around (and more coming) I'll see about getting a nice pretty one that Mahjik has.

 

thats not correct. they have taken a strap from a broken one and put it on top too

 

Yup, there is no top piece.

To the original thread starter: I have a crossover pipe if you need it, but it looks like the one you have is just fine.

 

Yeah, I agree. One of my first guesses seems to be correct than the crossover pipe is connected to the mounting tabs on the bottom. So I'm good!