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Location:
Eindhoven
Registered:
September 2004
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difference between horizontal and vertical Webers
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Fri, 01 October 2004 10:59
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Hi,
who knows the difference between horizontal and vertical Webers.
right know i have the standard carburetor of the 3k-h motor. i can buy the SR intake manifold and twin Weber's (vertical).
what is the advantage of these conversion???
thnx Mark
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Location:
Brisbane
Registered:
May 2002
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Re: difference between horizontal and vertical Webers
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Fri, 01 October 2004 12:07
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The terms you're looking for are sidedraught (horizontal) and downdraught (vertical).
Sidedraughts are great for top-end power because they offer the shortest and most direct path from the throttle plates to the inlet valves, with no major changes of direction in between. This has some disadvantages in terms of bottom-end driveability and fuel economy, not to mention the extra manufacturing cost and space issues (they make the engine very wide), which is why downdraught carbs are much more common on production cars.
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Location:
Canberra, ACT
Registered:
September 2002
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Location:
Eindhoven
Registered:
September 2004
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Re: difference between horizontal and vertical Webers
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Mon, 04 October 2004 15:06
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thnx,
i'm getting downdraught webers. I don't know the size of the webers yet. I get it by mail this week. But does anybody know how much increase in hp ther will be???? And which k&n air filters i should use??
thnx
Mark
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Location:
Canberra, ACT
Registered:
September 2002
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Re: difference between horizontal and vertical Webers
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Mon, 04 October 2004 15:36
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I don't know the size of the webers yet. I get it by mail this week.
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you're buying them and you don't know what they are?!
IDA? IDF? DGV? DFV? ADM? ADFA?
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But does anybody know how much increase in hp ther will be????
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determined by entirely tuning, which in your case will mean changing jets and possibly emulsion tubes and venturis until you get it running properly.
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And which k&n air filters i should use??
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the appropriate part for the carbs you are getting. at this stage, though, filters are the last thing you need to worry about. rather, you should be contemplating sourcing of appropriate jets, throttle linkages, fuel hose + fittings, and possibly fuel pressure regulator, possibly fuel pump. Some Weber carbs are notoriously picky about fuel pressure.
I also highly recommend purchasing Haynes Techbook #10240. It covers a great variety of Weber carbs, sidedraught and downdraught, in excellent detail, including rebuild and tuning instructions. You'll be needing it. Really.
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Location:
Eindhoven
Registered:
September 2004
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Re: difference between horizontal and vertical Webers
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Mon, 04 October 2004 15:42
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I not only buy the webers, i buy the complete set, wich I can directly bolt on my 3k.
But now i think it isn't easy to make these carbs run.
I think i call some one who has (any)knowledge about this.
and i thaught it was so easy 
thnx
Mark
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Location:
Eindhoven
Registered:
September 2004
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Re: difference between horizontal and vertical Webers
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Tue, 05 October 2004 19:04
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the webers are 36mm...
does this help??
Mark
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Location:
Canberra, ACT
Registered:
September 2002
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Re: difference between horizontal and vertical Webers
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Wed, 06 October 2004 00:00
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not really. what model are they?
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Location:
Melbourne
Registered:
May 2002
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Re: difference between horizontal and vertical Webers
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Wed, 06 October 2004 01:58
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The main difference between the two are mainly for packaging purposes. You want the straightest path as well, but sometimes that gives way to fitment issues.
In some cars it's possible to fit sidedrafts, some cars it's not.
Then you get downdrafts, they are the same carb, but the float chambers are designed to work when the carb is mounted vertically.
Your local library should have a few books about weber carbs.
dodgydan
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Location:
Eindhoven
Registered:
September 2004
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Re: difference between horizontal and vertical Webers
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Thu, 07 October 2004 18:08
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36 DCNF is the type of the webers. does thes increase much power???
Mark
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Location:
tallahassee FL usOFa
Registered:
May 2002
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Re: difference between horizontal and vertical Webers
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Fri, 08 October 2004 03:53
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you are really writing about a single carb. with 2 barrels/chokes/venturies/throats aren't you, not multiple Webers, right???
are both 36mm or is the secondary different?
is the secondary mechanical or vacuum operated?
what size carb is it replacing?
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Location:
London
Registered:
July 2004
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Re: difference between horizontal and vertical Webers
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Fri, 08 October 2004 04:44
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I used to run a golf (1.6) on a 40 DCN Webber carb and it made a big difference in power, response and noise over the standard Solex.
I presume that the 36 DCNF would be a very similar design- twin barrels of equal size. If you are upgrading from a smaller carb you'll get similar benefits, plus Webbers are pretty reliable.
The 40 DCN wasn't particularily good with fuel as both barrels opened at the same time, my girlfriend's '76 2002 is running a 32/36 DGV Webber that is fairly economical (only opens the 36mm barrel on the second half of throttle travel- mechanical link) if that's a concern. Cheaper than a DCN for rebuilds too- the parts are getting hard to find.
As for filter- you'll be best going to somewhere like autobarn/repco,etc and ordering a kit to sit on top for about $30. K&N stuff is complex and v. expensive.
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Location:
Canberra, ACT
Registered:
September 2002
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sure, you can pick up a cheap pair of Dellortos on ebay, maybe even with rebuild kits included, but then you're going to want to change jet and probably choke sizes at least once or twice. the bits aren't nearly as commonplace, == more expensive than for downdrafts