Go Back  Bike Forums > Bike Forums > Framebuilders
Reload this Page >

Hydroforming with a Pressure Washer

Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

Hydroforming with a Pressure Washer

Old 07-28-23, 03:10 PM
Senior Member
Thread Starter
CliffordK's Avatar
Join Date: Nov 2014
Location: Eugene, Oregon, USA
Posts: 27,588
Mentioned: 217 Post(s)
Tagged: 0 Thread(s)
Quoted: 18050 Post(s)
Liked 4,360 Times in 3,257 Posts
Hydroforming with a Pressure Washer

Ok, I bumped into this video on YouTube a couple of days ago. And it got the mind spinning... I know, DANGEROUS!!!

Obviously their welds leaked a little bit at high pressure. But that probably doesn't matter. STAND BACK when working under pressure!!!

BikeForums? Well... I'm not sure that uncontrolled pressure forming would be that useful in frame shaping, and fabricating molds for home use would be a lot. However, cyclists have issues with dealing with random dents here and there.

If one is dealing with the main frame, then making plugs would be helpful. I don't know the pressure needed to take out a dent, but probably not extreme. One could make thread-in bottom bracket cups to seal, or for attachment fittings.

Many seatstays or chainstays have vent holes that could have a tube brazed onto for pressure. Or, perhaps a rubber sealed clamp-on fitting.

Of course, getting the water out of a tiny vent hole would be a pain and would probably require an oven.
CliffordK is offline  
Old 07-28-23, 05:14 PM
Senior Member
GrayJay's Avatar
Join Date: Sep 2009
Location: EagleRiver AK
Posts: 1,299
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Likes: 0
Liked 58 Times in 31 Posts
You could plug end of frame tube that is difficult to access by freezing it in a block of ice to seal the tube end. You could even do this in combination with placing a pressure connection hose that passes through the ice plug, into the tube so that the pressure washer can be externally connected to the tube to pressurize within.
I've also had some limited success with removing dents by plugging tube end with ice, adding more water to completely fill the tube through a downtube water bottle boss so the new liquid water is in contact with the dent. Seal the water inside the frame with screws through the boss and then let it freeze. Expansion of water creates high pressure within as it freezes, just be careful not to split the tube. Helps if you live somewhere that gets down below 10F outside in winter or if you have a large chest freezer.
GrayJay is offline  
Old 07-29-23, 03:34 AM
Senior Member
Join Date: Jan 2013
Location: South Jersey
Posts: 2,236
Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 702 Post(s)
Liked 760 Times in 455 Posts
We used to do dent removal in Motocross exhaust pipes by plugging the ends and pressurizing them with air. Then you slowly heat the dent area with a torch and watch the dent come out. You had to be careful not to overheat the metal to the melting point or it would just blow out a hole.
dsaul is offline  
Likes For dsaul:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.