| [ Total Views: 1036 | Total Replies: 22 | Thread Id: 84902 ] |
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 EgeWorks
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| posted on July 20th, 2010 at 03:53 PM |
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Venturi boring
Hi all,
Anyone know somewhere reputable in Aus I can get Weber venturis bored out to a size of my choosing? Aus places want crazy money (i.e. over $50 each,
they are $15 in the US) for buying replacements.
Cheers,
Eden.
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Sides
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| posted on July 20th, 2010 at 04:23 PM |
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Haven't had any vents bored about, but why not just buy 'em in from the US ???
I brought in 4 x 38mm 44IDF venturi's and 4 x emulsion tubes from CB Performance a couple weeks back.... delivered in 6 days, and cost me under $200
AUD landed for the lot. Way cheaper AND faster than what the local carb specialists could do (once place told me 10 days to get up from Melbourne...
what the !?!?)
The Aussie Dollar has come up a bit since then too... up over 88 cents at the moment... so it'd be even cheaper now methinks !!!
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EgeWorks
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| posted on July 20th, 2010 at 06:29 PM |
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Yeah I was thinking that but i can't find anyone with 36 IDF vents. Lots of 40/44 though. Anyone you know that does them?
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 Bizarre
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| posted on July 20th, 2010 at 07:03 PM |
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Give Holzl a call
or contact Alfa1750 on ebay??
What size you have now??
Futue te ipsum!!!
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EgeWorks
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| posted on July 21st, 2010 at 06:54 AM |
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Hi Barry,
I've got 28s in there now. Planning a 1916 so I'm going to need maximum size. Weber place near me has 34s, which would be mighty thin I reckon, but
they want $55 each and don't do exchanges.
The Alfa guy on ebay is a good tip.
Cheers,
Eden.
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Sides
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| posted on July 21st, 2010 at 08:02 AM |
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I've read in a few places that the venturi's from some models of 36IDF are interchangeable with ones from 40IDF's... no idea of how to verify that
other than trying it... do you know anyone with a set of 40IDF's in their parts stash ???
Another option would be to run them without venturi's at all... seen pics of that being done on drag car's, so must be OK at WOT but dunno how
streetable it would be...
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| posted on July 21st, 2010 at 10:00 AM |
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Bud Pauge of Redline Weber (USA), told me that boring out venturis is a big no-no. Bud probably knows more about Webers than most, and he recons the
air flow can be disturbed enough to upset the operation of the carby. I'm sure he is right, but I suppose they make a few bucks selling venturis.
Cheers, Greg
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BRUTUS
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| posted on July 21st, 2010 at 11:23 AM |
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It sounds like a bad idea, to bore them out. I've got some Weber 32's bored out (only) to 34 and the shape is Wrong, and the machining has cut into
the slightly porous cast metal, ie they are rough. I would never do it again. If you buy new ones, you can always go back to them if needed... or
sell on to someone else. Why ruin good expensive Weber parts?
ACE 30 & 40 oils: specifically engineered for your Air Cooled VW
delivered (free del.) throughout Yarra Valley / Ranges, & Gippsland areas. Also ACE 20, 50 & 90.
FOR SALE: ACE 30, 40 etc. Oil formulations & Trade-names.
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EgeWorks
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| posted on July 21st, 2010 at 11:36 AM |
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You've convinced me guys. No boring out vents. Now to find some!
Interested to know if they are the same size between 36 - 40, sounds unlikely to me given the thoat size is different but I've been wrong plenty of
times before.
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Sides
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| posted on July 21st, 2010 at 11:52 AM |
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| Quote: | Originally
posted by EgeWorks
Interested to know if they are the same size between 36 - 40, sounds unlikely to me given the thoat size is different but I've been wrong plenty of
times before.
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Yeah, sounded odd to me too, but then I've seen stranger things happen before.
Really I should've hung onto the links - doh! - but a quick google search came up with this discussion samba:
http://www.thesamba.com/vw/forum/archive/index.php/o-t--t-365082--.html
... and this from a parts site in the UK.
http://www.dellorto.co.uk/merchandise/products_details.asp?PartNo=71506&C...
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Sides
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| posted on July 21st, 2010 at 12:15 PM |
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Oh - here ya go - try asking Gracey !!!
http://forums.aussieveedubbers.com/viewtopic.php?tid=61788
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HappyDaze
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| posted on July 21st, 2010 at 12:44 PM |
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It would be good if someone (not me) would start a thread on what is available for sale / swap / loan / wanted etc. regarding things like Weber bits.
Vents., emulsion tubes, jets and so on are expensive, and quite often used once and then put away in a tin. I believe that the part you want is often
sitting in a cupboard, or under a bench somewhere, not being used.
Cheers, Greg
I'd rather wear a Beetle out by racing it than by polishing it!
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vassy66T1
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| posted on July 21st, 2010 at 12:48 PM |
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Hey
I have a set of 4: 32mm venturis out of some 36IDF's I owned in the past.
Send me a pm if you are interested.
Cheers
Marcus
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EgeWorks
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| posted on July 21st, 2010 at 01:04 PM |
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Interesting reads there Sides - really appreciate the info. My 36s are Italian so I'll pop out the vents and measure them this weekend. I actually
made a venturi pulling tool last time I had to change them. Hopefully I can find it still.
Greg, sounds like a good idea - I have a bunch of stuff I'm not using at the moment.
Marcus, we'll see what else I can dig up, but I'll keep you in mind.
Cheers,
Eden.
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Sides
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| posted on July 21st, 2010 at 04:30 PM |
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| Quote: | Originally
posted by EgeWorks
Interesting reads there Sides - really appreciate the info.
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Yah - no probs - have internet connection, will search.
Sometimes at work I just need to change headspace, and a challenge is always good fun.
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vlad01
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| posted on July 21st, 2010 at 07:39 PM |
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don't bore them out. There is suppose to be a certain ratio between the diameter of the venturi and the throttle otherwise there wont be a
negitive
pressure at the main jet nozzles. The consequence of boring them out is leaning the AF out throughout the entire rev range (except idle).
The venturi works on the exact same principal as the aerofoil (wing) You dont go shaving the top of a plane wing to make it fly faster? It wont fly at
all.
On the plus side little bit bigger is fine, but dont go massive or it will do as above.
71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE |
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vwo60
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| posted on July 22nd, 2010 at 01:34 PM |
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Hi, i can see no reason why you cannot bore them out to a larger size or make new one as long as you have a sample of the size that you need, i have
been making them for years with no issues with the tuning, some of the originals that you get are very roughly die cast and have no real form of
accurracy in there manufacture
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Sides
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| posted on July 22nd, 2010 at 02:21 PM |
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Although I'm in the "get new ones rather than boring them out" camp, it's a personal preference really... if done PROPERLY (shape etc.) and if
good quality metal to start with you shouldn't have a problem.
....BUT (and this is a big but)...
...as I've found out today after A LOT of runs on the dyno, changing venturi sizes can give you some very unexpected changes in your tune (read AF
ratio). A bigger venturi doesn't just lean it out across the range, or even mid range or top end... it changes how most everything works, and how
much it changes each aspect is dependant on everything else. Doing a venturi change, well you basically need to forget everything you thought you knew
about tuning or jetting the carbs with the previous size venturis.
So yeah... my vote would be try to line up new bigger ones, and when the engine is all together and in the car do some comparison stuff. Depending on
your cam, rev range, intended use, fuel, availability of jets etc.... the smaller venturi's may actually work better for you (or not).
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EgeWorks
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| posted on July 22nd, 2010 at 02:30 PM |
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Sides - that's why I'm sorting out the vent issue first, then do the rest of the jetting to suit.
Another plus with getting new vents is I can always go back to them if new ones suck. If bored out ones are no good then I'm up the creek.
Will keep this thread up to date with my measurements and hoepfully results.
Cheers,
Eden.
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Sides
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| posted on July 22nd, 2010 at 03:42 PM |
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Yup, cool - sounds like you've got it covered then. Definitely keen to see how you go.
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EgeWorks
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| posted on July 24th, 2010 at 02:14 PM |
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Venturi measurements are as follows:
OD = ~40.5mm
Height = ~36mm
Accurate to about .2mm or there abouts. The vents have a very small amount of play, they slip in and out quite easily and the aux vent holds them down
tight.
Lost my puller tool BTW, had to use the screwdriver trick - at least they are not on an engine.
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EgeWorks
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| posted on July 28th, 2010 at 10:26 AM |
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Alright, have had confirmation that 36IDF vents are the same external dimensions as 40IDF.
One thing you have to be aware of though is that becasue the throttle plate/butterfly is 36mm you cannot use vents biggger than 34mm otherwise the
venturi effect is lost and they will run like crap.
Cheers,
Eden.
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Sides
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| posted on July 28th, 2010 at 10:55 AM |
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Cool - good to hear that little puzzle has worked out !!!
Good info to know I reckon.
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