Rrp carbon pipe repair

[Jstaff53]

So I picked up a 2010 superjet with a rrp pipe the other day and discovered the previous owner didn’t have it set up properly causing the pipe to get to hot and some of the resin fail. Out the outside where the manifold meets the pipe there are some cracks in the resin and on the inside a fair amount of carbon is starting to fray. The pipe is still solid and seems workable. My question is this, is it repairable? Has anyone experienced this? Who would be able to fix it or how would you go about fixing it?

 

[Sanoman]

A question you want to ask first is how you would fix it? How would you be able to get inside to make the repairs? At some point in the pipes life it got way too hot,causing it to delaminate.

“Going about fixing it? ” Great question.l have never fixed one,but IMHO l think taking a round wire brush on a flexible line and a drill and to get inside to rough the surface up and remove was flaking off.Clean with acetone and then get some epoxy resin,probably a little thickened,enough to get it to pour inside the pipe but still cling on to the inside surface.
Pure speculation on my thoughts and others may chime in l hope to give their opinions.

Don’t know if that will help you and good luck!

 

[Req]

@Downrange is at waverave right now but he is the only person off the top of my head that has home made a carbon pipe from his own mold. He did a lot of research on temp stable resins as well as technique. I would try to pick his brain if I were you.

 

[Jstaff53]

I was thinking, clean he pipe out best as possible put a fair amount of resin in there. And then blow up some kind of thick ballon to get every thing to lay flat

 

[Sanoman]

I was thinking, clean he pipe out best as possible put a fair amount of resin in there. And then blow up some kind of thick ballon to get every thing to lay flat

that sounds like a good plan

 

[Vumad]

I would have some serious doubts about the ability to clean and prep the surface sufficiently enough to ensure a proper repair with the amount of oil that builds up on the inside of the pipe. Not to say it's not worth a try.

You can definitely repair it from the outside.

Pipe builders (I think it was TNT) have stated that aluminum resonates better than carbon so if you take away the finish and add material that negates the weight savings you have lost all of the advantages of the carbon chamber. I would also speculate that if you don't do the body work on the inside of the pipe you add extra turbulence to the air flow which will affect performance to some extent.

 

[hydrostyler]

I made my own carbon chamber a few years back and its holding up great. When designing mine, I made a short carbon tube insert in the manifold end so that I could really get the coupler bands tight and not worry about crushing or distorting it. It sounds like if you are going to grind away any material inside the pipe, you could build an insert and epoxy it in. I found a cardboard tube near the size I needed and added painters tape until I reached the ID of the insert I needed. Then I put a layer of vac bag material over the tape before wrapping it with carbon fiber. Next wet the carbon fiber out with a high temp epoxy resin and wrap some bag material around that. stretch and wrap electrical tape around the bagging material to squeeze out the excess resin. After that cures for a day, unwrap and trim it. Get it to fit somewhat loosely in the end of your exhaust chamber, then remove it to post cure the part by cooking it in an oven / toaster oven per resin instructions. After that is done, you can use a high temp carbon paste to attach the carbon instert into the chamber and let it rip after it cures.
I know this sounds like a lot of work, but doing anything with carbon usually is. I don't think you'll just be able to smear some resin or paste in there and make it last. If you do try a quick fix, maybe jb weld or some type of devcon putty will hold up to some temperature.

 

[Sanoman]

I made my own carbon chamber a few years back and its holding up great. When designing mine, I made a short carbon tube insert in the manifold end so that I could really get the coupler bands tight and not worry about crushing or distorting it. It sounds like if you are going to grind away any material inside the pipe, you could build an insert and epoxy it in. I found a cardboard tube near the size I needed and added painters tape until I reached the ID of the insert I needed. Then I put a layer of vac bag material over the tape before wrapping it with carbon fiber. Next wet the carbon fiber out with a high temp epoxy resin and wrap some bag material around that. stretch and wrap electrical tape around the bagging material to squeeze out the excess resin. After that cures for a day, unwrap and trim it. Get it to fit somewhat loosely in the end of your exhaust chamber, then remove it to post cure the part by cooking it in an oven / toaster oven per resin instructions. After that is done, you can use a high temp carbon paste to attach the carbon instert into the chamber and let it rip after it cures.
I know this sounds like a lot of work, but doing anything with carbon usually is. I don't think you'll just be able to smear some resin or paste in there and make it last. If you do try a quick fix, maybe jb weld or some type of devcon putty will hold up to some temperature.

Great advise @hydrostyler A lot better then my suggestion

 

[Downrange]

I made my own carbon chamber a few years back and its holding up great. When designing mine, I made a short carbon tube insert in the manifold end so that I could really get the coupler bands tight and not worry about crushing or distorting it. It sounds like if you are going to grind away any material inside the pipe, you could build an insert and epoxy it in. I found a cardboard tube near the size I needed and added painters tape until I reached the ID of the insert I needed. Then I put a layer of vac bag material over the tape before wrapping it with carbon fiber. Next wet the carbon fiber out with a high temp epoxy resin and wrap some bag material around that. stretch and wrap electrical tape around the bagging material to squeeze out the excess resin. After that cures for a day, unwrap and trim it. Get it to fit somewhat loosely in the end of your exhaust chamber, then remove it to post cure the part by cooking it in an oven / toaster oven per resin instructions. After that is done, you can use a high temp carbon paste to attach the carbon instert into the chamber and let it rip after it cures.
I know this sounds like a lot of work, but doing anything with carbon usually is. I don't think you'll just be able to smear some resin or paste in there and make it last. If you do try a quick fix, maybe jb weld or some type of devcon putty will hold up to some temperature.

Sounds like a solid plan. I would find out what resin they are using. Before make ng the repair, I am sure it's epoxy. But with the high temp stuff there are is a lot of variation in the formula.