O-ring on a homemade pump.

[Mitchza89]

Hey guys,

I've been trying to make a homemade stirrip pump for a week now. I've tried a few different thanks for the plunger chamber because I just can't find any O-rings to fit the pipe....there either too big or too small.

Anyone know the best solution to this problem?

[elitesniper]

o ring grooves?

[Novacastrian]

Well the best solutions would be to 1. Buy a stirrup pump
2. Find the correct sized o'rings 3. Make your own o'rings 4. Make an epoxy piston 5. Make a "flared" piston (like an upside down suction cup).
That's about all i have got for ya mate.

[cwazy1]

well he already tried that and it doesnt work. .

i've heard that you can cut orings and then glue them together. i dunno.

[Novacastrian]

i've heard that you can cut orings and then glue them together. i dunno.

Yes you can, quite successfully too.
Just cut a big one, remove a section and super glue it back together

[cwazy1]

lol thats what the guys at ace tell me, i still refuse to listen to that cuz well lest just say my ace has a billion sizes of orings.

[Hotwired]

Well the best solutions would be to 1. Buy a stirrup pump

I'm feeling vexed by the way floor pumps either exist at fairly high volume and up to 250psi or miniscule volume and up to 300bar...

Someone needs to invent a popular industrial or home appliance that requires a floor pump that does up to 1000psi at a respectable volume per stroke.

Then it'll be cookies all round

[cwazy1]

lol @ cookies all round

[Hawkeye]

What are you using for the chamber? Using 3/4 inch copper(thinner walled) will allow you to find a suitable o-ring.

[elitesniper]

hey whats the difference between a shock pump and a stirrup anyways?

[cwazy1]

stirrup is a floor pump, shock pump is a tiny little sucker.

[Hawkeye]

Nothing. A stirrup pump is just scaled up so that you stand on "stirrups". The actual pump design is identical.

[Mitchza89]

Hey lads, sorry for the no reply. I've tried gal pipe, 1/2in poly pipe and 3/4in copper pipe. The copper pipe was the thick walled stuff I think (well I know it was the cheap imported shit from China), it couldn't even fit a 16mm marble in there. I hunted around for a long time but had no luck. Eh this is rather depressing

[elitesniper]

what about sch 80 pvc pipe?

[Mitchza89]

Nah I havn't tried that stuff. I might give it a go but eh, I wanna make it out of copper (makes it look fancy)