Engine anti pulse valve - VW Forum - VZi, Europe's largest VW, community and sales
 


     
 

Go Back   VW Forum - VZi, Europe's largest VW, community and sales > Tech Forums > Aircooled Mechanical Tech

Aircooled Mechanical Tech A Q & A Forum devoted to Aircooled Mechanical Issues. Got a problem? Then ask in here. Please, no 'For Sale' or 'Want To Buy' ads, plugs for your 'business', links to 'for sale' ads or Ebay links to your (or your mate's) auction (use the VZi 'Classifieds' section) - this also includes thinly veiled 'What's My Car Worth?' threads and "Who Can Sell Me A . . ." posts.

Machine 7, high quality air-cooled  restoration and performance parts
Reply Post New Thread
 
Thread Tools Display Modes
Old 03-06-2009, 12:53 PM   #1
moody porsche man
Chat Slapper

Trading feedback: (0)
 
Join Date: Apr 2008
Posts: 323
Default anti pulse valve

hi guys,
i'm going to switch my 009 for a vac/mech Distributer.

Where can i buy an anti pulse valve to fit between my dissy and my twin 40 dells ?

cheers.
moody porsche man is offline   Reply With Quote
Old 03-06-2009, 01:25 PM   #2
Forsh
I'm not an addict... honest!
 
Forsh's Avatar

Trading feedback: (1)
 
Join Date: Dec 2001
Location: Wigan, Lancs
Posts: 4,176
Default

europa car parts IIRC

__________________
I get pushed out of shape and its hard to steer
When I get rubber in all four gears

Forsh is offline   Reply With Quote
Old 03-06-2009, 05:15 PM   #3
Trikky2
I really must get out more
 
Trikky2's Avatar

Trading feedback: (0)
 
Join Date: Oct 2006
Location: St Gerie-Atrique SW France.
Posts: 6,360
Default

Im a bit puzzled by anti pulse valves since even if your getting a vac signal from only one cylinder the pulses are still pretty quick.

For instance at tickover there shouldnt be any vac signal anyway but lets take the extreem example and say 900 rpm. Since the cylinder will fire every two turns of the crankshaft that means you get a vac signal 450 times per minute which is 7.5 pulses per second.

Now aside from the unlikelyhood of anybody driving at light throttle at 900 rpm...

Considering the vac pipe is small diameter and the vac can is quite large by comparison, I cannot see how the reservoir of vac in the pipe and in the canister and the inertia of the associated base plate and points assembly could respond so fast as to shimmy at 7.5 times per second.

So I guess my question is why are they fitted?
Trikky2 is offline   Reply With Quote
Old 03-06-2009, 11:42 PM   #4
flatinit
Chat Slapper
 
flatinit's Avatar

Trading feedback: (0)
 
Join Date: Dec 2006
Posts: 98
Default

My hunch, for what it's worth.... is that I think the anti pulse chamber takes advantage of the compressible nature of air, as it increases the volume of air than the pipe would have on it's own, the result is more effective. So, rather than the Dizzy responding to every pulse from the manifold it averages out to give an even pull on the advance.
flatinit is offline   Reply With Quote
Old 04-06-2009, 09:27 AM   #5
moody porsche man
Chat Slapper

Trading feedback: (0)
 
Join Date: Apr 2008
Posts: 323
Default

Thanks for the replies guys.

Does anyone have a direct link to a anti pulse valve on a website ?

I've been on the europa website and cant find the valve. I dont even know what they look like or how much they cost ?

Cheers.
moody porsche man is offline   Reply With Quote
Old 04-06-2009, 09:39 AM   #6
Mr.Whippy
Highly Respected Member

 
Mr.Whippy's Avatar

VZi Member Sponsor

Trading feedback: (3)
 
Join Date: May 2002
Location: Thornton, Lancashire, UK.
Posts: 10,704
Default

They used to be available from Europa specialist spares but I can't find them in the online shop.

Eurocarb also used to stock them but I can't see them online there either. I'd give them a ring and ask. They're very helpful over the phone.

Some folk have got them from a donor alfasud at the same time they liberated the carbs.

Dave.
__________________
New Golf / Scirocco clutch kit free to enthusiast - Must collect from Thornton nr Blackpool - http://www.volkszone.com/VZi/showthread.php?t=914706

Mr.Whippy is offline   Reply With Quote
Old 04-06-2009, 12:09 PM   #7
dave18
Help! I'm trapped in here
 
dave18's Avatar

Trading feedback: (1)
 
Join Date: Aug 2004
Location: Gorleston Norfolk
Posts: 8,954
Default

Got mine from EUROCARB recon they are the best know their stuffd and fast tooo

http://www.dellorto.co.uk/merchandis...rtsectionID=71
__________________
How more mixed up can you get
A scot living in norfolk :D
thats why its avalible in english if you subscribe
There is a reason i call them 00HELL
dave18 is offline   Reply With Quote
Old 04-06-2009, 01:39 PM   #8
Trikky2
I really must get out more
 
Trikky2's Avatar

Trading feedback: (0)
 
Join Date: Oct 2006
Location: St Gerie-Atrique SW France.
Posts: 6,360
Default

Quote:
Originally Posted by flatinit View Post
My hunch, for what it's worth.... is that I think the anti pulse chamber takes advantage of the compressible nature of air, as it increases the volume of air than the pipe would have on it's own, the result is more effective. So, rather than the Dizzy responding to every pulse from the manifold it averages out to give an even pull on the advance.
Eeeerm......
Trikky2 is offline   Reply With Quote
Reply Post New Thread

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT +1. The time now is 09:13 AM.


Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.

Disclaimer: For recreational purposes only, some assembly required. Any resemblance to real persons,
living or dead is purely intentional and the site admins are not responsible for direct, indirect,
incidental or consequential ridicule resulting from any defect or failure to perform. No animals
were harmed in the creation of this forum. Colours may fade over time. No other warranty expressed or implied.

volkszone.com

SupportingSupporting Brad's Cancer Foundation

 
 
© Volkszone • Terms and Conditions of use