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Weber carburetor dating and history of changes

after searching here I didn't find a decent thread with the complete history of weber numbers, dating, changes, etc. ( if someone knows of one please post a link here )


from what I've been able to glean this is what I have so far. webers used in porsche 'production' 911s were:

40IDT3C and 40IDT3C1
1968 911T (non-USA)

40IDA3C and 40IDA3C1
1966 - 67 911
1968 911L (non-USA)

40IDS3C and 40IDS3C1
1967 - 68 911S

40IDAP3C and 40IDAP3C1
1968 911 & 911L (USA)

40IDTP3C and 40IDTP3C1
1969 911T
1971 only 2.2 911T (non-USA)

40IDTP13C and 40IDTP13C1
1970 - 71 914/6

earliest webers were serial numbered ('66 to '70). these numbers may have been tied to the engine or car build or vin number. this number was numerals only. marked 'made in italy' and had the rectangle around the W with an E above it. (sandcast).






after porsche no longer needed webers for production cars, weber went to a number/letter date code in 1970. (sandcast).




later carbs were marked 'italy' and not 'made in italy' and were cast in spain. (sandcast)



last ones were not marked 'italy' at all and were made by carter/USA. these seem to be commonly seen on mfi cars that were converted to carbs in the early '80s. also the weber logo changed. (diecast).




any and all input much appreciated. I'll edit this first post as info comes to light.





,


Last edited by haycait911; 03-04-2011 at 11:24 PM..
Old 02-27-2011, 11:05 PM
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I believe that the dates for the IDS were 67 and 68. The IDT was Euro 911T, only. The IDTP was used on the 69 US 911T and (I'm not as sure) the 914-6. IDTP was an emission control version of the IDT.

Paul Abbott has a wonderful explanation of Webers at performanceoriented.com. It is must reading for anyone who has them.
Old 02-28-2011, 03:51 AM
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The three barrel Webers were supplied for Ferrari 512BB, 365 GT4/BB and for the Lamborghini Miura P400 as well as for the Porsche production cars. Model number for the Ferraris was 40IF3C and 40IDL3C for the Lamborghinis. I currently have a set of Webers from a 512BB and they have date codes. It is also interesting that the Ferrari carbs utilize some of the extraneous bosses found on the later castings. These bosses were used for extra items such as cold starting features and for mounting various components we Porsche guys don't use. The picture is of a 40IF3C throttle body. In 1981 the 512BB began using CIS so I expect Weber saw little use for making the three choke carbs and thereafter sold the design to Carter carbs here in good old USofA.



I believe the three choke Weber was developed for a Lancia V-6 in the mid 1950s but haven't been able to pin this down; I have found that the 1961 Ferrari (Dino 156 "Sharknose") Phil Hill won his F1 championship driving used the three choke Webers. Since the Solexes were causing issues for Porsche and the Webers were an off-the-shelf Weber product it makes since that Porsche went with them.
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Last edited by 1QuickS; 02-28-2011 at 08:14 AM..
Old 02-28-2011, 08:07 AM
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Lancia is also what I heard, but who knows...

I also heard that Carter made the later ones in Brazil and they suck.
Old 02-28-2011, 11:07 AM
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It's sometime in 1970 , not 1971 that weber changed the stamped ID format from serial number to (whatever the number/letter codes are ?) .

The earlier serial numbers are not tied to any specific car. Just the unit number of that carb's type starting at the first carb : unit number 1.

I learned this from a cobra person some years ago.


Why did they change stamping format . Who knows? I can't even find anyone who knows how to decode the letter/number format. And try to get any answers from anyone related to weber today.

Impossible, it no longer exists.
Old 02-28-2011, 12:07 PM
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My Weber 40 IDA3C Carburetors were made by Carter. Paul Abbott rebushed them for me and they run great.
Old 02-28-2011, 05:47 PM
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the below is stolen from 'performance oriented' also edited into first post.

40IDT3C and 40IDT3C1
1968 911T (non-USA)

40IDA3C and 40IDA3C1
1966 - 67 911
1968 911L (non-USA)

40IDS3C and 40IDS3C1
1967 - 68 911S

40IDAP3C and 40IDAP3C1
1968 911 & 911L (USA)

40IDTP3C and 40IDTP3C1
1969 911T
1971 only 2.2 911T (non-USA)

40IDTP13C and 40IDTP13C1
1970 - 71 914/6

Last edited by haycait911; 02-28-2011 at 09:01 PM..
Old 02-28-2011, 08:59 PM
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Quote:
Originally Posted by 1976 TN Porsche View Post
My Weber 40 IDA3C Carburetors were made by Carter. Paul Abbott rebushed them for me and they run great.
I also had them in my '73 2.7 and they ran perfectly. seems to be a bit of a hit and miss thing.
Old 02-28-2011, 09:03 PM
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This thread was interesting to me. I always wondered what exactly my carbs were. I have two sets, one of which I will be putting on my engine when I get my car together. Those I will be putting on the car are 40IDA3C1 or '66/'67 911 carbs. My back up set are 40IDS3C1 or '67/'68 911S. Cool! Both sets, especially the 40IDA3C1's, look almost new.
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Old 03-01-2011, 04:34 PM
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Here is one of my made in USA Weber 40 IDA 3C Carburetors.
Old 03-01-2011, 05:50 PM
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Guys, please post the carb S/N and the original engine and year if possible.
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Old 03-01-2011, 06:07 PM
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Quote:
Originally Posted by Grady Clay View Post
Guys, please post the carb S/N and the original engine and year if possible.
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Best,
Grady
yes please! it would be nice to get a sense of carb serial number vs. car and engine numbers. if you know yours are original to the car please post the numbers.
Old 03-01-2011, 09:53 PM
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new info posted.
Old 03-04-2011, 11:25 PM
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Here , I dug through my photo's , as I knew I had one carb number photo which I had noted which car it was from.

This carb is from 1967 911S no. 306615 (I don't have a photo saved of the COA. But I saw it , when I saved these photo's. And the date noted (if they transcribed the correct one) was Nov. 3, 1966. It was a U.S written COA . If you zoom in on the number , it is 40IDS3C1 no. 1491. This car was said to have been very original before restored . I believe when numbers start being posted tied to car serial number . Only carbs from cars which people have a good inkling that the carbs have a good chance of being original to that chassis , should be posted. And I think the carb numbers are going to do a certain amount of jumping high & low , as the motor assemblers were not looking at the numbers. Just grabbing the proper type. That is why also , I believe (?) a 67/68 911S can originally come with a 40IDS3C1 , along side a 40IDS3C (that is after the point when 3C1's were introduced) . But there could be a (general) progression in numbers . It really depends on how many carbs of each type Weber shipped the factory at one time. Remember, I'm believing that EACH type, started with unit no. 1. So there would be a series of numbers starting with No. 1 for 40IDS3C's . Just as there would be for 40IDS3C1's :







I cannot be 100% certain. As I did not make a note, but I believe the motor number of this car was 960841. Maybe someone else saved a copy of the COA when this car was being marketed (or made a note of engine to car / davep ?).

Last edited by RatBox; 03-05-2011 at 09:36 AM..
Old 03-05-2011, 09:15 AM
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Everything original

1968 911 901/17
VIN 11835660
Engine 3380402
40IDAP3C #2023
40IDAP3C1 #2037
Karmann
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Old 03-05-2011, 09:37 AM
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Well from looking Mr. JTP'scarbs numbers. Maybe Weber did not differentiate in starting a new unit number sequence (starting at zero) , when a updated version was introducted (40IDAP3C to 40IDAP3C1 , for instance). .


That would be quite a concidence to get carb numbers that close if not (although from what i've seen. I think that having carbs numbered that closely , is a bit of an anomoly).


Hopefully , we will find out.
Old 03-05-2011, 09:59 AM
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I believe the only difference between and IDAP3C and an IDAP3C1 is which side of the engine the carb is mounted on. The difference would be which end of the carb the throttle linkage is mounted to.

However, I could be wrong.
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Old 03-05-2011, 10:03 AM
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Thx for the input , I don't know.


I had only assumed they were a newer series change (something other than RH/LH). Because when I started out reserching webers. I started with 48IDA's .

This series starts with 48IDA then go to 48IDA1 (well actually , they start with a completely differant number before that but then changed to 48IDA , 48IDA1 , etc. ) .

And the number change does not have to do with righthand/lefthand.



But , on the downdraft 3 bbls . I have no idea for certain
Old 03-05-2011, 10:27 AM
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Quote:
Originally Posted by MrJTP View Post
I believe the only difference between and IDAP3C and an IDAP3C1 is which side of the engine the carb is mounted on. The difference would be which end of the carb the throttle linkage is mounted to.

However, I could be wrong.

all the webers I've seen, the '1' denotes driver's side.

I have two pairs of IDS. one set numbered 1057 and 1371. the other 2156 and 2471.

production numbers for '67 S were 2306 cars and '68 S were 1709 cars.

so, my thinking is that the first set would be mid- 67 production and the second early- 68.

I also have a set of IDAP3C number 443 and 452. pretty close. these would be very early '68 911 or 911L. I would expect that as production progressed the pair numbers would get further out of whack for a variety of reasons.

of course one can imagine the development and racing departments helping themselves to carbs anywhere along the line. but it would be good to see a numeric progression through the production run.

so, again, if your car has original webers please post your numbers.
Old 03-05-2011, 11:19 AM
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Is Dave going to incorporate this data into his vin/engine#/type/tran#/type database?

Hello, Dave?

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Old 03-05-2011, 02:21 PM
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