 How can I repair dents in header pipes? |
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| tornik550 |
 Dec 17 2016, 07:30 PM
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#1
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Senior Member  Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None  |
I have a backup set of /6 headers that have some dents. The dents are on the curved areas. I am sure that air flow would be reduced with these dents. On one of the dents, I drillled a small hole on the opposite side, heated the pipes, stuck a small solid metal rod through the hole and tried to pound out the dent. I was able to remove the debt however the area is now fairly rippled. I don't think I can flatten it would more without making a bigger hole which would be much more difficult to weld shut.
The ripples are not horrible however you can definitely see them. Should I just leave the ripples or is there some other way to fix the issues? If it were on a straight pipe, it would be easy to weld a new pipe in its place however not easy on the curves. |
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| colingreene |
Dec 17 2016, 07:53 PM
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#2
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Senior Member Group: Members Posts: 729 Joined: 17-October 13 From: Southern California Member No.: 16,526 Region Association: Southern California |
post pictures.
often times the small dent will do almost nothing performance. |
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| tornik550 |
Dec 17 2016, 08:21 PM
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#3
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
The two debts arrowed in red are the problems. I'm not worried about the green one since it's on a straight. I can fix that one.
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| jmill |
Dec 17 2016, 08:52 PM
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#4
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Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
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| rick 918-S |
Dec 17 2016, 09:03 PM
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#5
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Hey nice rack! -Celette Group: Members Posts: 20,458 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region 
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I would us a torch and a rod slid down the pipe to push It out. Or cap the opening and put about 125 psi of air in the tube and heat it with a torch. It may expand. Just be ready to cool it off so it doesn't blow out the tube.
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| falcor75 |
Dec 18 2016, 07:05 AM
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#6
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Senior Member Group: Members Posts: 1,579 Joined: 22-November 12 From: Sweden Member No.: 15,176 Region Association: Scandinavia
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https://www.motortrendondemand.com/detail/e...ts-/0_ujj8a8mw/
Those dents wont make any notable difference. |
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| tornik550 |
Dec 18 2016, 07:06 AM
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#7
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
QUOTE(falcor75 @ Dec 18 2016, 08:05 AM)  https://www.motortrendondemand.com/detail/e...ts-/0_ujj8a8mw/ Those dents wont make any notable difference. Wow. That very surprising. |
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| mb911 |
Dec 18 2016, 07:07 AM
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#8
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914 Guru Group: Members Posts: 6,851 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest
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So the secret in the exhaust industry is to cap the ends and pressurize the tubing to about 10psi. Then heat with an oxy torch and the dents will pop out..
I have don't this tons of times and have done it On front oil cooler lines for 911s many times as well. |
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| PlaysWithCars |
Dec 18 2016, 10:22 AM
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#9
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Senior Member Group: Members Posts: 524 Joined: 9-November 03 From: Southeast of Seattle Member No.: 1,323 Region Association: Pacific Northwest
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QUOTE(falcor75 @ Dec 18 2016, 05:05 AM) https://www.motortrendondemand.com/detail/e...ts-/0_ujj8a8mw/ Those dents wont make any notable difference. So mandrel bent versus cheaper header construction? No difference? Really surprising given the amount of marketing and premium prices associated with mandrel bent headers. |
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