Hydroformed exhausts. Expansion chambers and Megaphones

**NOS_350X** · 03-03-2008, 09:33 PM

You can use water in a brake master. I have some from cars here. 3 gallons (thats a gess) of brake fluid aint going to be cheap.

rex found this for me, i would say that would be about perfect.

http://orangecounty.craigslist.org/tls/576515844.html

**Billy Golightly** · 03-03-2008, 09:36 PM

Thats exactly what I was just fixing to reply with and suggest, a what we call here "porta-power". The only thing is I'm not sure it'll be enough volume unless you do some sort of sub-tank.

**Autophysn** · 03-03-2008, 09:45 PM

I would think that the water would have to be in the pipe at the time of heating it up. Then as the metal becomes maleable, you would add pressure.
Kinda like blow molding glass.

**Autophysn** · 03-03-2008, 09:50 PM

I forgot, reason being, and I do not have much experience with this. But My dad is a old school body man, one of his techniques is heating the metal and splashing water to it, to make the metal conract immeadiatley. This way, I guess, he can remove the strech the metal aquired from the impact. What ever it may be. Again, I am a mechanic, I suck at body work. My 2 sense

**hondahaulic** · 03-03-2008, 10:12 PM

yea my next suggestion was going to be a porta power. I was looking at ours and its got a 10 ton sticker on the hand pump that should be plenty.

Im not really sure that a tractor would put out too much pressure though, I mean with it at idle speed and the proper lever valve, you can operate hydraulics really slowly. What will extra pressure hurt? It would have to over inflate the pipe before it ruptured it no matter how much pressure there is.

**cr480r** · 03-04-2008, 05:48 AM

I would use the powerwasher... And plumb in a guage and an adjustable pressure regulator if the existing one didn't have enough adjustment range... Hydrualics and brake fluid just sounds like a mess IMO... water is much easier to clean up, and free of cost... lol..

**money89tractors** · 03-04-2008, 08:09 AM

That porta-power thing is what theyre using in one of the links posted. If it is filled with water, and you pre-fill the "exhaust", there shouldnt be any reason there wouldnt be enough fluid to expand the pipe.

I would, however, want an inline valve that i can close in case (for some odd chance) there isnt enough fluid in the porta-power to completely expand the pipe. This valve will allow you to take the pressure off the porta-power so you can refill it.

-Phil

**NOS_350X** · 03-05-2008, 03:09 AM

auto, using heat while it is presurized with watter would be a worse idea than even presurizing it with air. Basicaly at that point you created a steem engine. Instant explosition as you get it hot enough to turn to steem.

Now im going back and fourth between several ideas, one is trying to find some sort or correct pump that can pump the watter how i want, but thats not getting ANYWHERE.
Another is a car/truck brake master, now i dono if yall have tryed this but you can run watter in a brake system. (seen a guy do it at a flattrack race) the master will pump water. Now im thinking it will just take FOREVER to build up the amount of pressure needed, In one of the links it was 25 bar, which i was told is around 375psi you will be doing alot of pumping.
That brings me back to the idea of the pressure washer, i would have a guage on one end with a valve (spicket or something simular) on the other end start off with just a watter hose giving the pressure to make shure you got it all sealed up. Then use the pressure washer (the end of mine has a quick cuppler) just pop it on and pull the trigger, biggest problem is going slowely, BUT if you have ever see how much volume comes out of one? Take off the nozzle and check it, Really its not that much. I think it would still go decently slow.
Well those are my thoughts, any other ideas are grately appericated.

**cr480r** · 03-05-2008, 06:22 AM

pulling the trigger on a pressure washer doesnt regulate pressure... just flow... you would need an adjustable pressure regulator... maybe even two of them to get down to a safe pressure range...

**SWIGIN** · 03-05-2008, 08:40 AM

Originally Posted by NOS_350X

auto, using heat while it is presurized with watter would be a worse idea than even presurizing it with air. Basicaly at that point you created a steem engine. Instant explosition as you get it hot enough to turn to steem.

Now im going back and fourth between several ideas, one is trying to find some sort or correct pump that can pump the watter how i want, but thats not getting ANYWHERE.
Another is a car/truck brake master, now i dono if yall have tryed this but you can run watter in a brake system. (seen a guy do it at a flattrack race) the master will pump water. Now im thinking it will just take FOREVER to build up the amount of pressure needed, In one of the links it was 25 bar, which i was told is around 375psi you will be doing alot of pumping.
That brings me back to the idea of the pressure washer, i would have a guage on one end with a valve (spicket or something simular) on the other end start off with just a watter hose giving the pressure to make shure you got it all sealed up. Then use the pressure washer (the end of mine has a quick cuppler) just pop it on and pull the trigger, biggest problem is going slowely, BUT if you have ever see how much volume comes out of one? Take off the nozzle and check it, Really its not that much. I think it would still go decently slow.
Well those are my thoughts, any other ideas are grately appericated.

375psi would not be alot of pumping with brake fluid since it dont compress like water....and they build a lot more presure then that in a panic stop

**Billy Golightly** · 03-05-2008, 11:02 AM

Unless your gonna be using a huge mastercylinder, I think the small amount of volume its going to move will take forever to pump up a pipe. I mean look how small the resivoirs are, you'd need what, like a 100 or of those to fill a normal sized expansion chamber? Your looking at several gallons at least.

**SWIGIN** · 03-05-2008, 03:38 PM

i thought we were talking ghetto..... the porta power is the way id go

but ether way will use the same amount of fluid and id still use hydro fluid of some kind

**NOS_350X** · 03-05-2008, 05:28 PM

cr480 because its a liquid your pressure is going to be controled by your volume.

Spend a few minutes talking to a friend of mine that is a plumber. He has a hand water pump, Pumps up to 500psi. Then he said before they got that they used a pressure washer, it just took a bit longer to get there because they dont push much volume. SO i will be trying using a pressure washer. hydrulic fluid donset compress, neather does watter.

Here is another idea i had, On metal tanks on the bikes when they get a dent you fill with water and freze it, BAM no dent. Now could you do in several times freezing water in the pipe possibly? No that is just a brainstorming idea. I will be using a pressure washer.

**money89tractors** · 03-05-2008, 06:59 PM

Originally Posted by NOS_350X

Here is another idea i had, On metal tanks on the bikes when they get a dent you fill with water and freze it, BAM no dent. Now could you do in several times freezing water in the pipe possibly? No that is just a brainstorming idea. I will be using a pressure washer.

Freezing water in it might work, but would be a VERY slow process.

Although there is a great deal of pressure here, the water being pushed in is whats forming the chamber. The pressure comes from pushing the water into the pipe. Once the water is in, there will be no more pressure. So pressure is only build when adding the water, its not constant.

-Phil

**Daddio** · 03-23-2008, 02:12 PM

Here's a cool link. I will post more later.
http://www.gifford.ca/hydroform.html

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