Pressure washers, how do they work?

[hareng]

Very interesting concept Busa, seems three ways the exhausts are made.
Trouble doing by this method is how accurate the pattern cut out is and the folding over. 2T need back pressure.
Thats my concern having gone a similar route to get more hp many years ago.
How were the works bikes done.

All the hydraulic cylinders over the years i have made have been filled with oil and water pumped in under pressure up to 10000psi. Have had two 10000 psi rated fittings blow around 6000psi, all that happens is that area parts approx 3 to 4".
Enerpac is the easiest just plumb in to normal compressor and other pipe submersed in water. Used to crap myself but had to be done.
Could use a converted grease gun with pressure guage, did a few in early days that way. Make sure you get a 10k psi one though, most are 6000psi. Cheapish and easy but take some grunt above 4500 psi.
At least it would test the welds for leaks!

 

[busastars]

Chears hareng,

Yep blowing exhausts is not as good as doing cone rolling BUT TBH I am rubbish at rolling cones and getting frustrated doing them. But you can get very good results by blowing them, few of the good tunners do it that way but the best pipes are cone rolled.

Just trying new ways of doing things and the best way to suit me, not many people have done this and the ones who have keep quiet about it. Ive done a fair bit with tuning expansion chambers, got some realy good designs already.

 

[busastars]

Just to add a new spin on this:

What are peoples thoughts on these Test Pump you can buy, I know the popular make seams to be Rothenberger but I probably would get the Clarke from Machine Mart.

I know nothing about them, one guy I know blowing exhausts uses one and he said it helps as it can hold high preasure inside the chamber for long periods of time while he manipilates the chambers.

If I bought one what else could I use it for, any other jobs they can do?

 

[Dereklee]

well......is the question so stupid? then, i'm stupid, too...haha .
but i've learnt a lot! thanks for you guys.

 

[busastars]

Well I went all out and bought the Clarke PTP100 preasure test pump.

I went down the local to get some fittings / unions but that confused me (nothing changes there )

My measurements is about 19 / 19.5mm for the screw ID of the thread, so this gets me thinking I need a 3/4" BSP.

Now the guy in the shop sold me two taped union's, they fit well BUT he told me there 1/2" union's. The union measures start of the taper about 20mm and at the top of the taper about 21.5mm.

So what have I got, 1/2" or 3/4" BSP ?

 

[rtbcomp]

Look here under "Technical"

http://www.mig-welding.co.uk/forum/showthread.php?t=15742

 

[busastars]

Look here under "Technical"

http://www.mig-welding.co.uk/forum/showthread.php?t=15742

Chears, got it I think. Not done anything with BSP before so the thread/size range confused me.

Ive got 1/2" BSP.

 

[hareng]

Could have told you that Busa if i was on earlier. Best of luck cutting that thread in steel.

Nipper wants a Jolly Moto.

 

[busastars]

Could have told you that Busa if i was on earlier. Best of luck cutting that thread in steel.

Nipper wants a Jolly Moto.

Ive got two steel unions here so going to weld each one to some tube.
One for the hose to attach, one for the tap. Ordered a ball valve tap to screw on. The other ends of the tube that the unions are welded on will be welded onto the pipes im creating and cut off when finished.

Still I will post up my results, hopefully they will work. Im only going to have a go at the headers for now.

As for the Nipper, get him a bike. Got to start young and have it bread into you, also it will give him a project to work on.

 

[hareng]

Never tried this but link above looks like the pressure washer really struggling at probably 80 to 90 bar before exhaust failed.
The test is 60bar.

Worth asking the question i reckon how much pressure? Dependant upon gauge and width.
Just so you could take it back!

 

[hareng]

Turn it into a fun bike after, old school YZ490, CR500, KX500 or something, nice and light, tuned of course, still retain the 125 stickers.

 

[busastars]

One person who been giving me alot of information said for headers he pumps them to around 400-500 psi then taps them around with a hammer with the preasure held in the header.

I carnt post all the information he has supplied me as he makes them to order as part of what he does and would be taking the mick, still I can only get so much information out of him aswell because of this. He is a top guy though and makes some inpresive pipes for people.

If I can end up doing this then I can post my results and information from my findings, should help a few people learn a new technique.