RazMan
|
| posted on 10/12/10 at 06:01 PM |
|
|
Locost Vacuum Plenum
You know the feeling when you make something that's really cheap, simple and just as good as expensive shop-bought items? Well I was thinking
about how I am going take the vacuum feeds from my throttle bodies and bring them together so that I have a common vacuum source for the fuel
regulator, idle valve etc etc. The cheapest I could find was about £35 and seemed huge for fitting in the engine bay. Looking around in my odds &
ends box I found an old fuel filter like this one.
 
Description
I think I paid about £2.50 for it a while back. So I got my drill and taps out, found some suitable air fittings and an hour later came up with
this..
 
Description
To get the size needed, I had to make the fittings by soldering two halves of different adaptors together
 
Description
I can now take all 6 vacuum lines (4mm hose) and merge them into an 8mm hose - perfect!
I just wanted to share 
[Edited on 10-12-10 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
|
|
|
|
|
blakep82
|
| posted on 10/12/10 at 06:10 PM |
|
|
pictures don't seem to work. not even in your archive 
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
|
|
|
v8kid
|
| posted on 10/12/10 at 06:16 PM |
|
|
Looks OK to me!
You'd be surprised how quickly the sales people at B&Q try and assist you after ignoring you for the past 15 minutes when you try and start a
chainsaw
|
|
|
blakep82
|
| posted on 10/12/10 at 06:17 PM |
|
|
hmm, that is strange then., all other photos seem to be working for me...
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
|
|
|
ashg
|
| posted on 10/12/10 at 06:23 PM |
|
|
looks too small to me.
the problem with joining all of them together with small pipes is that you get a pulse effect which will play havoc with the fuel regulator map sensor
etc. the ideal size of a vacuum pulse smoothing chamber without affecting the vacuum response is about the size of a 330ml coke can.
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
|
|
|
Confused but excited.
|
| posted on 10/12/10 at 06:48 PM |
|
|
Poo! Pics won't open for me either.
Archive pics open OK but not these, strange.
Tell them about the bent treacle edges!
|
|
|
stevec
|
| posted on 10/12/10 at 07:01 PM |
|
|
I thought a plenum was the opposite of a vacuum
Steve
|
|
|
MikeR
|
| posted on 10/12/10 at 07:02 PM |
|
|
quote:
Originally posted by ashg
looks too small to me.
the problem with joining all of them together with small pipes is that you get a pulse effect which will play havoc with the fuel regulator map sensor
etc. the ideal size of a vacuum pulse smoothing chamber without affecting the vacuum response is about the size of a 330ml coke can.
I was wondering if you'd get the pulsing, talking to a dutch bloke at Stoneleigh this year and he was talking about this exact issue, he thought
the best solution was an electronic damper circuit. IrvineD knows the bloke who I was talking too.
|
|
|
dhutch
|
| posted on 10/12/10 at 07:02 PM |
|
|
I can see the pics...
|
|
|
loggyboy
|
| posted on 10/12/10 at 07:07 PM |
|
|
Pics are red Xs for me, both on here and in your gallery/archive.
|
|
|
RazMan
|
| posted on 10/12/10 at 09:24 PM |
|
|
Strange that some are having problems with the pics - I haven't a clue why that should be
Regarding the pulsing issue, I have not detected any problems so far, but it might be the fact I have six cylinders which may be smoother than a
four-pot? If anything I would have expected the small bore hose (4mm) and 3mm i/d connectors to damp out any pulses - it certainly sounds very smooth
if I disconnect the pipe and listen to the hiss.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
|
|
|
rusty nuts
|
| posted on 11/12/10 at 11:22 AM |
|
|
If you do have problems with pulsing it might be worth fitting a vacuum reservoir from something like a Mk2 golf that uses a Pieburg carb?
|
|
|
britishtrident
|
| posted on 11/12/10 at 11:37 AM |
|
|
Just Tee together then pass them through a small bore restrictor then a plenum volume then another restrictor
The volume dosen't need to be that large provided you use restrictors.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
|
|
|
.jpg)
