Author Topic: Venturi, or tip in before the pump?  (Read 7695 times)

Offline nigelb

  • Wiki Editor
  • Grand Gunge Master
  • ******
  • Posts: 1429
  • Location: Leicester
Re: Venturi, or tip in before the pump?
« Reply #15 on: May 24, 2013, 11:16:57 PM »

I have found that when introducing neat methoxide straight into the pump it boils and cavitates in the pump,
so it needs to be done slowly.

If that's the case I can see the need for caution.

Offline nigelb

  • Wiki Editor
  • Grand Gunge Master
  • ******
  • Posts: 1429
  • Location: Leicester
Re: Venturi, or tip in before the pump?
« Reply #16 on: May 24, 2013, 11:18:25 PM »

It would be nice at some point to fit a venturi, but right now it's just a case of the cheapest and quickest way possible to get the thing running.

How much do venturis cost then?

That would depend on who you buy them from.

Offline Head Womble

  • Wiki Editor
  • Oil baron
  • *******
  • Posts: 2082
  • I like shiny things
  • Location: Heathrow area
Re: Venturi, or tip in before the pump?
« Reply #17 on: May 24, 2013, 11:20:59 PM »

I have found that when introducing neat methoxide straight into the pump it boils and cavitates in the pump,
so it needs to be done slowly.

If that's the case I can see the need for caution.

Oh yes, I soon stopped and rethought my approach. It spits the methoxide back into the container.

It turned out my pump was partly blocked stopping my venturi from working.
« Last Edit: May 24, 2013, 11:24:38 PM by Head Womble »
Skoda Yeti L&K 2L TDI 150 CR DPF Adblue, running pimp diesel.
VW Golf SV 1.4 TSI DSG.

Offline greasemonkey

  • Wiki Editor
  • Grand Gunge Master
  • ******
  • Posts: 1765
  • Location: Breconshire
Re: Venturi, or tip in before the pump?
« Reply #18 on: May 24, 2013, 11:31:02 PM »

It would be nice at some point to fit a venturi, but right now it's just a case of the cheapest and quickest way possible to get the thing running.

How much do venturis cost then?

No idea. Everything is too expensive when ya broke. ;D

In all honesty, half the thrill of it for me is making things myself. I've got loads of different projects that need finishing quick, so I'm just looking at whats quickest to get functional at the moment.

http://vegoilcollection.weebly.com/

I Is An Oily Lickle Chimp.

Offline nigelb

  • Wiki Editor
  • Grand Gunge Master
  • ******
  • Posts: 1429
  • Location: Leicester
Re: Venturi, or tip in before the pump?
« Reply #19 on: May 24, 2013, 11:37:29 PM »

It would be nice at some point to fit a venturi, but right now it's just a case of the cheapest and quickest way possible to get the thing running.

How much do venturis cost then?

No idea. Everything is too expensive when ya broke. ;D

In all honesty, half the thrill of it for me is making things myself. I've got loads of different projects that need finishing quick, so I'm just looking at whats quickest to get functional at the moment.

If you want to make the venturi yourself I'll lend you the core of your choice. This way you can cast to your hearts content. I have cores for 40, 80 and 110/120 lt /min pumps.

Offline nigelb

  • Wiki Editor
  • Grand Gunge Master
  • ******
  • Posts: 1429
  • Location: Leicester
Re: Venturi, or tip in before the pump?
« Reply #20 on: May 24, 2013, 11:39:59 PM »

I have found that when introducing neat methoxide straight into the pump it boils and cavitates in the pump,
so it needs to be done slowly.

If that's the case I can see the need for caution.

Oh yes, I soon stopped and rethought my approach. It spits the methoxide back into the container.

It turned out my pump was partly blocked stopping my venturi from working.
Were you inducing through the venturi and the cavitation happened in your pump?

Offline greasemonkey

  • Wiki Editor
  • Grand Gunge Master
  • ******
  • Posts: 1765
  • Location: Breconshire
Re: Venturi, or tip in before the pump?
« Reply #21 on: May 24, 2013, 11:45:51 PM »

It would be nice at some point to fit a venturi, but right now it's just a case of the cheapest and quickest way possible to get the thing running.

How much do venturis cost then?

No idea. Everything is too expensive when ya broke. ;D

In all honesty, half the thrill of it for me is making things myself. I've got loads of different projects that need finishing quick, so I'm just looking at whats quickest to get functional at the moment.

If you want to make the venturi yourself I'll lend you the core of your choice. This way you can cast to your hearts content. I have cores for 40, 80 and 110/120 lt /min pumps.

Tidy, thanks for the offer. Probably be winter now before I do anything about it. I'll bare you in mind. Thanks.
http://vegoilcollection.weebly.com/

I Is An Oily Lickle Chimp.

Offline nigelb

  • Wiki Editor
  • Grand Gunge Master
  • ******
  • Posts: 1429
  • Location: Leicester
Re: Venturi, or tip in before the pump?
« Reply #22 on: May 24, 2013, 11:53:41 PM »
I could bring one to Chugs if you're coming along. What size are you looking at?

Offline greasemonkey

  • Wiki Editor
  • Grand Gunge Master
  • ******
  • Posts: 1765
  • Location: Breconshire
Re: Venturi, or tip in before the pump?
« Reply #23 on: May 25, 2013, 12:04:56 AM »
I'm going to be using 22mm pipe. I think my pump in 70 LPM.
I'll check it out and give you a shout. Cheers.
http://vegoilcollection.weebly.com/

I Is An Oily Lickle Chimp.

Offline Head Womble

  • Wiki Editor
  • Oil baron
  • *******
  • Posts: 2082
  • I like shiny things
  • Location: Heathrow area
Re: Venturi, or tip in before the pump?
« Reply #24 on: May 25, 2013, 09:30:58 AM »

I have found that when introducing neat methoxide straight into the pump it boils and cavitates in the pump,
so it needs to be done slowly.

If that's the case I can see the need for caution.

Oh yes, I soon stopped and rethought my approach. It spits the methoxide back into the container.

It turned out my pump was partly blocked stopping my venturi from working.
Were you inducing through the venturi and the cavitation happened in your pump?

No, my venturi wasn't working due to a partly blocked pump, so I was trying to suck the methoxide in via the gly drain.
Sorry, I wasn't very clear about the circumstances before.
Skoda Yeti L&K 2L TDI 150 CR DPF Adblue, running pimp diesel.
VW Golf SV 1.4 TSI DSG.

Offline Chug

  • Administrator
  • Oil obsessive
  • *****
  • Posts: 783
  • Location: Herts
Re: Venturi, or tip in before the pump?
« Reply #25 on: May 25, 2013, 04:16:56 PM »
I suck my glyc back in through the bottom drain, I attach a length of rubber hose to bottom drain outlet and shove it in container on the floor, half open bottom drain valve and then when air in container has stopped bubbling half close the tank bottom valve and she starts sucking back in via bottom drain valve...simples

Offline Head Womble

  • Wiki Editor
  • Oil baron
  • *******
  • Posts: 2082
  • I like shiny things
  • Location: Heathrow area
Re: Venturi, or tip in before the pump?
« Reply #26 on: May 25, 2013, 09:08:07 PM »
I suck my glyc back in through the bottom drain, I attach a length of rubber hose to bottom drain outlet and shove it in container on the floor, half open bottom drain valve and then when air in container has stopped bubbling half close the tank bottom valve and she starts sucking back in via bottom drain valve...simples

This is how I add my gly, but I don't recamend adding methoxide this way,
for one thing you'll end up with soap in the bottum of the drum due to an overdose of catalyst on the small amount of oil that enters the drum.
Skoda Yeti L&K 2L TDI 150 CR DPF Adblue, running pimp diesel.
VW Golf SV 1.4 TSI DSG.

Offline Chug

  • Administrator
  • Oil obsessive
  • *****
  • Posts: 783
  • Location: Herts
Re: Venturi, or tip in before the pump?
« Reply #27 on: May 26, 2013, 01:09:00 PM »
Doh!..oh yeah, got carried away with me thoughts after a few bevvies and forgot it was methoxide!