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Old 26th May 2012, 12:41   #1
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Default How to remove dents on a silencer bend pipe?

Hi Folks,


I just wanted to know whether there is any proven methods to remove dents on a silencer bend pipe. This is for my Rajdoot bobby. The bend pipe is very short in length unlike REs etc.

One method would be to cut it open, repair it and weld it again. Any other options? Any methods using water pressure? Like in the case of hydroformed chambers? Where can find people doing this job? Inputs please..
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Old 26th May 2012, 12:49   #2
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Default Re: How to remove dents on a silencer bend pipe?

I have seem deformed steel pipes/drums being repaired on an industrial scale with extremely high air or water pressure...

But this usually requires special equipment and very high pressures...
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Old 26th May 2012, 13:40   #3
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Default Re: How to remove dents on a silencer bend pipe?

Quote:
Originally Posted by aruncheloor View Post
Hi Folks,


I just wanted to know whether there is any proven methods to remove dents on a silencer bend pipe. This is for my Rajdoot bobby. The bend pipe is very short in length unlike REs etc.

One method would be to cut it open, repair it and weld it again. Any other options? Any methods using water pressure? Like in the case of hydroformed chambers? Where can find people doing this job? Inputs please..
Simplest option is the one you have menitoned. Cut - repair - weld back or if replacement works out cheaper then just replace the part. Hydro-forming is prohibitively expensive for one off jobs as you need to make a die/mould for it. There is a company in Bangalore that does Hydro-forming, but they are on an industrial scale and do not even touch low quantities.
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Old 26th May 2012, 14:01   #4
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Default Re: How to remove dents on a silencer bend pipe?

Quote:
Originally Posted by aruncheloor View Post
Hi Folks,


I just wanted to know whether there is any proven methods to remove dents on a silencer bend pipe. This is for my Rajdoot bobby. The bend pipe is very short in length unlike REs etc.

One method would be to cut it open, repair it and weld it again. Any other options? Any methods using water pressure? Like in the case of hydroformed chambers? Where can find people doing this job? Inputs please..
How long is it? You can gas-cut it open on the inside or on the existing seam as you see fit, repair & reweld it. That is the most practical way of doing it in my opinion, provided you have a good welder. Hydroforming would be both more effective AND cost-effective in the event of a large part which has large deformed areas.
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Old 26th May 2012, 14:18   #5
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Default Re: How to remove dents on a silencer bend pipe?

The part is too small. I'll post actual pics later. Its impossible to replace the part as Bobby spares are hard to find.

Can a silencer bend pipe can be made using local pipe bending people in some lathe?
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Old 26th May 2012, 14:38   #6
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Default Re: How to remove dents on a silencer bend pipe?

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Originally Posted by aruncheloor View Post
The part is too small. I'll post actual pics later. Its impossible to replace the part as Bobby spares are hard to find.

Can a silencer bend pipe can be made using local pipe bending people in some lathe?
Er, for that, I would not recommend hydroforming.

As I said, the cheapest option looks like cutting it open.

As to your other query, a lathe is not the tool for this. Maybe you can get hold of a seamless pipe rated for high temperatures, but flaring it for the flange, flanging it to mount on the head, welding it on the can side and bending it to that angle, all the while making it look like the original may be beyond your local workshop's expertise.

Add to that the plating job, and I'm inclined to suggest that cutting it may be the easiest option.

Unless, you are open to extending the red coloured heat-shield / exhaust cover - that is, if you are that keen on covering dents. I'm sure your local fabrication shop will be able to do THAT.
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Old 26th May 2012, 14:57   #7
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Default Re: How to remove dents on a silencer bend pipe?

From what I can see in the picture the bend seems like a simple 'U' bend. If that is the case then you can get a new pipe made with a matching bend and then weld on the other stuff like the cylinder adaptor and then chrome plate the whole thing. Can you post a couple of photos of only the bend pipe from different angles?
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Old 26th May 2012, 21:03   #8
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Default Re: How to remove dents on a silencer bend pipe?

You can drill a small hole on the opposite side of the dent and push it out using a rod. Then fill the hole back up. since the hole will be on the inside of the bend, cosmetic damage will also be minimized.
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Old 26th May 2012, 21:22   #9
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Default Re: How to remove dents on a silencer bend pipe?

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You can drill a small hole on the opposite side of the dent and push it out using a rod. Then fill the hole back up. since the hole will be on the inside of the bend, cosmetic damage will also be minimized.
That sounds to be a good idea. Bend pipe is at the work shop. Let me take a pic on Monday.



Another idea..
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Old 27th May 2012, 22:38   #10
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Default Re: How to remove dents on a silencer bend pipe?

That was a brilliant Idea!!! Much better than working with pressurized water.
But it can burst the seams too. So you might have to do a few iterations before you get the right volume of water to just push the dents out!
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Old 28th May 2012, 11:32   #11
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Default Re: How to remove dents on a silencer bend pipe?

Quote:
Originally Posted by aruncheloor View Post
Hi Folks,


I just wanted to know whether there is any proven methods to remove dents on a silencer bend pipe. This is for my Rajdoot bobby. The bend pipe is very short in length unlike REs etc.

One method would be to cut it open, repair it and weld it again. Any other options? Any methods using water pressure? Like in the case of hydroformed chambers? Where can find people doing this job? Inputs please..
Arun,

Try and find if there are any one who makes/repairs brass/copper utensils around Trichur. Or see if you can find some one who will do what we call in Malayalam - Eyyam Poosal (tin coating). These people can rectify dents in vessels with very narrow openings as they have the right shapes tools for it.

Before I have used the services of such people in Trivandrum to repair dents in the bend pipe of my old Yezdi and other bikes without cutting it open.

Worth exploring.

Best Regards & Drive/Ride Safe

Ram

Last edited by r_nairtvm : 28th May 2012 at 11:34.
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Old 30th May 2012, 18:01   #12
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Default Re: How to remove dents on a silencer bend pipe?

This is the state of the bend pipe as of now. I think i better fabricate a new one..
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How to remove dents on a silencer bend pipe?-bobby-bp.jpg  

How to remove dents on a silencer bend pipe?-bobby-bp1.jpg  

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Old 30th May 2012, 18:43   #13
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Default Re: How to remove dents on a silencer bend pipe?

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Originally Posted by aruncheloor View Post
This is the state of the bend pipe as of now. I think i better fabricate a new one..
Arun, that is a simple 'U' bend. Any competent pipe bending fellow can do a new bend for you. Get a new one is my suggestion.
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Old 30th May 2012, 18:55   #14
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Default Re: How to remove dents on a silencer bend pipe?

Arun,

I think the pipe is repairable. Only you have to find some one who specialises in either reapiring silencers or some one with dent removal experience.

If you have any friends in TVM send them this picture and ask them to show this (picture) to mechanic Mr. Madhu, who has his workshop near the Vallya Salai railway overbridge on the Kochar Road.

If he agrees then you can send him the pipe and if he can he will do it for you in less than an hour. Then you can get it chromed where ever you want

Best Regards & Drive/Ride Safe

Ram
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Old 31st May 2012, 01:15   #15
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Default Re: How to remove dents on a silencer bend pipe?

@ Vikram.. It looks simple.. but its not a simple 180 degree bend. It has an angle. I'll post another pic tomorrow.

@ Ram. Thanks a lot. Infact, i did consult some people who does such works. They suggested a new fabricated one because the surface of this one is too uneven to look good when chromed. This dent is due to absurd hammering (to make the bend pipe fit into the silencer) by some local mechanic.
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