/6 Webers, Questions |
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/6 Webers, Questions |
EdwardBlume |
Mar 7 2017, 03:29 PM
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#1
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914 Wizard Group: Members Posts: 12,338 Joined: 2-January 03 From: SLO Member No.: 81 Region Association: Central California |
How can you tell what size Webers you have? Is there a website for /6 motors that lists out the configurations? I want to see if the 2.4 set up I have (just rebuilt) will work on a 930 / 03.
Also, how do you measure the headers, will they work? |
mskala |
Mar 7 2017, 03:37 PM
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#2
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R Group: Members Posts: 1,925 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
Not sure what exactly you're asking. Webers are very configurable.
The main body comes in: 40mm IDTP (T motors originally) 40mm IDA 40mm IDS (S motors originally) 46mm Also PMO makes a compatible one in: 40mm 46mm 50mm Also you can send 40mm Webers to Performance Oriented and he will make them 42mm. What size you need depends on how much air you'll need. I _think_ from the Bird Board that people start needing 46mm for their 3.2's or hot 3.0's. Mark S. |
mepstein |
Mar 7 2017, 03:42 PM
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#3
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914-6 GT in waiting Group: Members Posts: 19,314 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
46mm webers go for big bucks. I sold a set for $4800 that were in decent shape but nothing special. Probably could have gotten more if I was patient but sold them to a good customer.
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EdwardBlume |
Mar 7 2017, 03:51 PM
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#4
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914 Wizard Group: Members Posts: 12,338 Joined: 2-January 03 From: SLO Member No.: 81 Region Association: Central California |
Thanks. Is the size and type stamped somewhere?
The 3.0 is a ROW 78-79, which is the same as US at 180 HP with the CIS. It has the original CIS on it, but I figure I can use the carbs. |
jmill |
Mar 7 2017, 04:07 PM
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#5
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Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
Do you have Bruce Anderson's book. He makes some recommendations in there for Weber sizing for just what you want to do. This is for the 3.0 SC:
Attached thumbnail(s) |
flyer86d |
Mar 7 2017, 05:33 PM
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#6
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Member Group: Members Posts: 429 Joined: 12-January 11 From: Corea, Maine Member No.: 12,585 Region Association: North East States |
The 40 or 46 is the throttle bore size in millimeters. Flip the carb over and measure. I think that the carb type is stamped into the carb body. I'll look at the set that I have in the morning. 40 IDS are easy to identify as they have a brass squirt tube that goes up and curves pointing straight down the center of each venturi. Bruce Andersons book gives you a good starting point as well as some of some of the formulas to calculate venturi size and baseline jetting. Most parts are available thru PMO as well as others.
Weber's like clean fuel. Idle jets clog easily. Weber carbureted cars run from one third to one half way thru their range on the idle jets. It is dismaying to have a cylinder lay down when you are planning to blow off the guy next to you at a stop light or toll booth because of a clogged idle jet. Also, the idle circuit likes to be a little rich so they transition to the mains without a stumble, particularly the 46IDA's. Our old track car had them and those who tried to keep up said it was like following a refinery. Charlie |
Mark Henry |
Mar 7 2017, 06:27 PM
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#7
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Size and version should be on the valve cover side/outside when on looking at them installed on the engine, it's on the float bowls.
One bowl will have a big EW and the other is stamped with the info. The stamping is quite small. They will work on a 3.0 just fine. You'll likely have to re-jet them and depends but you might need bigger venturis. If they are weber venturis the size is cast into them and you might be able to see this looking down the throat. I'd invest in a WB 02 meter, it will save you a lot of jetting guesswork. Also be aware a lot of tuners (like me) use jet reams to size jets, so while the size number may be correct, they also could be way off. You can buy jet size gauges. I'd go over to the Performance Oriented site and read all the tech pages. For parts the best price and selection I found is http://youroil.net/weber_carb_parts.html They are the east coast PMO source and it's a much easier to navigate than the PMO site. BTW besides the versions listed by mskala they could also be made in Italy (best and OE), Spain or USA. |
Mark Henry |
Mar 7 2017, 06:44 PM
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#8
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
This pic of one of my carbs the version info is on the left in the little box/boss beneath the word Weber
(IMG:http://www.914world.com/bbs2/uploads/post-26-1280752202_thumb.jpg) |
Bgyglfr |
Mar 7 2017, 07:11 PM
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#9
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Member Group: Members Posts: 55 Joined: 6-December 14 From: Springfield IL Member No.: 18,191 Region Association: Upper MidWest |
As mark said above. 40s will work on a 3.0 unless it is upgraded significantly. Ida, ids, Idt will all work. The idtp are odd but can also be made to work well with some mods. Most likely your carbs only need a venturis, emulsion tubes, and a rejet since you already had them running on your 2.4. I have a bunch of jets and venturies for webers around so I might have what you need.
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Justinp71 |
Mar 7 2017, 07:16 PM
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#10
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Senior Member Group: Members Posts: 1,584 Joined: 11-October 04 From: Sacramento, CA Member No.: 2,922 Region Association: None |
I had 40's on a mid horse 3.0 and they were perfect. I think they are the right size for a 160-240hp motor. |
larryM |
Mar 11 2017, 02:07 PM
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#11
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emoze Group: Members Posts: 891 Joined: 1-January 03 From: mid- California Member No.: 65 Region Association: Northern California |
start by looking at the venturis - IIRC they have a mm size mark on 'em -
on any heads from an injected car you will need the spacers that cover the injector cutout - PMO, Pierce & others sell 'em http://forums.pelicanparts.com/porsche-911...e-question.html http://forums.pelicanparts.com/porsche-911...-does-make.html http://www.performanceoriented.com/throttl...venturi-sizing/ Mike Pierce's pages - https://www.webercarbsdirect.com/Technical-...-Carbs-s/74.htm |
r_towle |
Mar 11 2017, 04:23 PM
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#12
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Custom Member Group: Members Posts: 24,588 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
How can you tell what size Webers you have? Is there a website for /6 motors that lists out the configurations? I want to see if the 2.4 set up I have (just rebuilt) will work on a 930 / 03. Also, how do you measure the headers, will they work? did you buy another six motor? What did you get? what are you doing with the old motor? rich |
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