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HomeAircraftHelicopterHelicopter Main Discussion › Water Freezing to fix dents in mufflers
07-15-2002 03:45 PM  16 years agoPost 1
DrScoles

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Redmond WA

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I have received a few private emails regarding this trick, so I thought I'd do a post. I have a Muscle Pipe that got a small dent on it. my buddy was repairing the heli for me and he made the MP look good as new by filling it with water, then placing it in the freezer...

Water expands and pushes out the dent. Any of you guys who have things to add, please do!

Mike

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07-15-2002 04:06 PM  16 years agoPost 2
BladeRunner

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Dents??
That's an interesting concept! But how does the freezing water know what is a dent...in other words how does it not affect the whole muffler??? I'm trying to figure how this would be controlled to just reshape the dents????

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07-15-2002 04:17 PM  16 years agoPost 3
heliman41

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Valparaiso IN. USA

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Bladerunner,
When water freezes to ice it expands always, and it always pushes on the softest spot first that would be the inward dent or the thinnest area. Since the muff is basicly the same in thickness it will always push out the dent first expanding to totally fill its volume first before putting too much pressure on the pipe, the total volume must be filled(frozen) first before any damage can happen. Im a plumber and see this type of freezing damage all the time in the winter. Simple physics here........as long as you remove the pipe asap when the dent is repaired the pipe will never get damaged.

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07-15-2002 04:18 PM  16 years agoPost 4
Steve Campbell

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Baton Rouge, LA

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Yeah; How do it know???

Steve

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07-15-2002 04:23 PM  16 years agoPost 5
heliman41

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Valparaiso IN. USA

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Funny Steve.
Water dosent know anything. Its simply expanding to fill the volume of the pipe, as I said simple physics........................

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07-15-2002 04:26 PM  16 years agoPost 6
BladeRunner

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Dents?
Thanks heliman41, I do understand about freeze-expansion......so you are saying not to completely fill the muffler??? I don't get how the expansion can be controlled and only affect the dent?? If the dent were in the end cap, wouldn't that be a bit thicker and therefore the side would expand first????

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07-15-2002 04:27 PM  16 years agoPost 7
heliman41

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Valparaiso IN. USA

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Whats importaint here really is how much water do you put in the pipe. Fill it to the top and cap off the ends and the dent is the least of your worries.

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07-15-2002 04:31 PM  16 years agoPost 8
heliman41

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Valparaiso IN. USA

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You want to fill over the dent but leave one end open as the ice expands in ALL directions at once it will push out the dent. If the muff is over filled and or capped off the pipe will split yes. Just keep an eagle eye on it after it starts freezing.

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07-15-2002 04:32 PM  16 years agoPost 9
BladeRunner

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Dent?
That's the part I wasn't understading.
OK, so fill just enough in the area of the damage and keep an eye on it???

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07-15-2002 04:33 PM  16 years agoPost 10
vetrider

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Daleville, AL (Ft.Rucker)

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You don't have to cap off the ends or fill it up completely. Just cover the damaged area. The water exposed to the AIR will freeze FIRST then the other water will push out the dent covered by water.

Worked real nice on my Hatori 985 after a good squashing in the side of the head.

Nolan

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07-15-2002 04:33 PM  16 years agoPost 11
BladeRunner

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Dent?
Sorry guy!! You hit submit before me!!

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07-15-2002 04:36 PM  16 years agoPost 12
heliman41

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Valparaiso IN. USA

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Remember ice expands in ALL directions at once not just up or down or sideways, after it forms a cap on top it then feeezes inward, after that it begins to expand as the ice crystals form gotta go somewhere. Anything in its path will get pushed first(the simple physics again) ie:the inward dent. If you had an outward dent ice wouldnt repair it as the ice would expand on the inward walls first. Does that help to explain expansion?

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07-15-2002 04:39 PM  16 years agoPost 13
heliman41

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Valparaiso IN. USA

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Thank you Vetrider,
Amen.

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07-15-2002 04:42 PM  16 years agoPost 14
bxc53

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Directly over the center of the Earth ( 98223)

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Freezing dents
Heliman,

I'm guilty of performing the repair for the good Dr.

What I did was fill the MP with as much H2O as it would hold while the inlet end was oriented up. I then set it in the freezer propped up in the same orientation. Nothing was capped . When the expansion pushed the dent out, the ice then expanded up the inlet tube. I did not monitor it, just left it overnight.

I learned this trick a long time ago repairing dented motorcycle tanks, FWIW.

It works well with smooth dents, but will not fix a sharp crease.

YMMV and all that

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07-15-2002 04:46 PM  16 years agoPost 15
heliman41

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Valparaiso IN. USA

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Yea one end open is critical I learned about this trick yrs ago from a friend who custom paints murdercycle tanks too. Thats how he fixed dented tanks in a big deep freezer @ his home. Ive never done it myself but did see the results, amazing really. When I dent something there is no reparing in the world for it.

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07-15-2002 05:04 PM  16 years agoPost 16
Michigan PI

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St Clair Shores, MI

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I recently did this for a severely crushed MP. Took 2 tries to get the dents out. It did not do anything for the bent outlet though. I did take before/after pics which I can post once I find them....

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07-15-2002 05:24 PM  16 years agoPost 17
rond

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MI, USA

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A buddy of mine fixed a dented muffler similar to this one time. He put a firecracker in it and lit the fuse. Pop, and the dent is gone. Seems this was a popular pastime in his youth, dent in a pop can, then pop it back to shape with a firecracker.

Ron

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07-15-2002 06:02 PM  16 years agoPost 18
ScottG

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Ft Wayne, Indiana

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I tried this trick a few weeks ago on my MP. it took 2 tries to get the dent out. however, the bottom end of the MP ended up looking like a boob on and old woman. It's clear now that I should have settled for 1 try.

Scott

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07-15-2002 07:44 PM  16 years agoPost 19
Steve Campbell

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Baton Rouge, LA

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<>

Of course it doesn't. That was a (attempted) joke; ya know, the Aggie and the thermos bottle???

Steve

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07-15-2002 07:52 PM  16 years agoPost 20
BladeRunner

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Ontario Canada. Member of "some sort" s

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Fix???
What the heck.........I'm gonna try it on a black muffler I have.......lost a gyro and the heli landed right on that poor muffler...on FROZEN ground yet!!! I managed to bend it out enough to get it away from the frame......but boy-O-boy it's UGLY!!! Now maybe I can give it a"face lift".......hehehe......I'll see how it goes....

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HomeAircraftHelicopterHelicopter Main Discussion › Water Freezing to fix dents in mufflers
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