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Anti-pulse valve
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benjaminjoseph
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PostPosted: Fri Jul 31, 2009 2:56 pm    Post subject: Anti-pulse valve Reply with quote

Anybody know which way the arrow on an anti pulse valve should face, toward the distributor or toward the carb??
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Randy in Maine
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PostPosted: Fri Jul 31, 2009 3:51 pm    Post subject: Reply with quote

Can you post a picture of this anti-pulse valve?
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benjaminjoseph
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PostPosted: Fri Jul 31, 2009 6:26 pm    Post subject: Reply with quote

oops...

Last edited by benjaminjoseph on Fri Jul 31, 2009 7:56 pm; edited 3 times in total
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busdaddy
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PostPosted: Fri Jul 31, 2009 6:29 pm    Post subject: Reply with quote

Close, but you need to insert the URL that ends in JPG between those 2 bracketed areas.
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benjaminjoseph
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PostPosted: Fri Jul 31, 2009 7:01 pm    Post subject: picture Reply with quote

oops..

Last edited by benjaminjoseph on Fri Jul 31, 2009 7:57 pm; edited 3 times in total
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benjaminjoseph
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PostPosted: Fri Jul 31, 2009 7:05 pm    Post subject: picture Reply with quote

http://picture.JPG[img][/img]
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busdaddy
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PostPosted: Fri Jul 31, 2009 7:11 pm    Post subject: Reply with quote

How to post photos: http://www.thesamba.com/vw/forum/viewtopic.php?t=6
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benjaminjoseph
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PostPosted: Fri Jul 31, 2009 7:49 pm    Post subject: anti pulse valve Reply with quote

Image may have been reduced in size. Click image to view fullscreen.
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busdaddy
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PostPosted: Fri Jul 31, 2009 8:10 pm    Post subject: Reply with quote

Well that's the crazyest thing I've seen today, not a VW part, some sort of gas saving technology robbed from aliens perhaps?

I'd remove it.

Sure it's an advance line and not a fuel line? maybe a check valve?
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PostPosted: Fri Jul 31, 2009 9:19 pm    Post subject: Reply with quote

concur - if it is between the dist port on the carb and the dist remove it. That is not a VW part.
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PostPosted: Fri Jul 31, 2009 11:38 pm    Post subject: Reply with quote

thread on these "mate"
http://www.volkszone.com/VZi/archive/index.php/t-145883.html

'Anti-Pulse' Valve >> Vacuum

Vacuum Advance 'Anit-pulse' distributor valve. Original equipment on Current Vehicles. Brass main casting. Designed to 'smooth the vacuum signal' from the inlet manifold, resulting in a more accurate ignition advance.
Weight: 100grams

Diameter: 13mm (1/2")

Depth: 25mm (1")

Part no APV001 (anti-pulse valve 4mm tails
£16.98 incl VAT


http://www.scarbro-racing.co.uk/fuelregulators.html

Or http://www.dellorto.co.uk/merchandise/products_det...ctionID=71

Vacuum distributor anti-pulse valve, helps to smooth the vacuum signal from the manifold to the distributor.

note: arrow points away from the distributor i.e. in the direction of the flow of vacuum.

Image may have been reduced in size. Click image to view fullscreen.

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benjaminjoseph
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PostPosted: Sat Aug 01, 2009 12:05 am    Post subject: Anti- pulse valve Reply with quote

It's actually a new aftermarket part called an antipulse valve it is manufactured by Europro over in the UK. I know what it is I bought it, I was just wondering if anybody has played with 'em. I've set up and rejetted dual Webber ICT's for my baywindow. It is purring away now just fine after a bit of experimentation. I've had a few ICT bus people recomend the anti-pulse valve to give a extra smooth ride, it works to even out the the vacume signal to a vacume advance when the signal begins right off of idle and also when it ends at about half throttle. Turn's out the arrow should face the carb (the direction of vacume), although can't say the improvement is major, only barely noticable. And yes that is a fuel line being used as a vacume hose, what ya gona do the Webber ICT vac port is huge...... thanks Merlin missed your post before writting most of this jibberish, ya hit the nail on the head.
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Wildthings
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PostPosted: Sat Aug 01, 2009 8:53 am    Post subject: Reply with quote

Decades ago many cars used 1/8 OD metal tubing for the vacuum advance line. Pretty tiny inside diameter. I suspect it preformed pretty much the same function except that it wasn't directional in anyway. I presume that the anti pulse valve is some kind of a metered check valve that will dump vacuum quickly if you punch thereby killing the vacuum advance and preventing knocking.
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Lil Lulu
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PostPosted: Sat Aug 01, 2009 9:16 am    Post subject: Reply with quote

I'm preparing to install a CS in my 72 with dual Webers. The requirement dictate from Jake is: vacuum must come from both carburetors to obtain the proper vac signature for the 205p. The early Spanish Weber pair that I got from ACE only has one carrying the vac port, so Jake requires that a simple can that provides a void (empty can) be adapted to the units for the proper advance without the pulsing. I think this may be the application for this valve.
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