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> WEBBER 40 - 914-6 or 911T Carbs, They seem to be the correct carbs but not stock?
ctc911ctc
post May 30 2025, 07:25 PM
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1970 914-6 all stock

All,

I am down to the last thing for this engine re-fresh: CARBS

They seem to be in very good condition and since they are missing the Porsche factory mark I am guessing that they were 'cored' on a rebuild sometime prior to my ownership

OR

Are 914-6 carbs NOT market like 911 carbs are???????

Anyway, I have not gone too deep since they are in great shape - the gaskets seem good, the floats are the brass kind but in perfect shape, the bowls are very clean,,,,,,

Can I get some direction on:

1. what to look for in a recently rebuilt carb
2. where is a good reference for setup prior to installation

Any other opinions would be well received,

Thank you Teeners


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Pictures will be added later
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rick 918-S
post May 30 2025, 09:00 PM
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euro911
post May 30 2025, 09:28 PM
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See if you can find a copy of this factory Weber Tuning Manual

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sixnotfour
post May 30 2025, 10:21 PM
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What Porsche marking are you referring to ?


they sound like the ones made after weber. not italian....PMO sold em a bunch..

Italian Weber for a -6 is stamped 40 IDTP 3c, its on this nos carb but bad lighting ..
smog carb with a stepped idle mix screw. IDAS have full taper


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porschetub
post May 31 2025, 12:05 AM
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QUOTE(ctc911ctc @ May 31 2025, 01:25 PM) *

1970 914-6 all stock

All,

I am down to the last thing for this engine re-fresh: CARBS

They seem to be in very good condition and since they are missing the Porsche factory mark I am guessing that they were 'cored' on a rebuild sometime prior to my ownership

OR

Are 914-6 carbs NOT market like 911 carbs are???????

Anyway, I have not gone too deep since they are in great shape - the gaskets seem good, the floats are the brass kind but in perfect shape, the bowls are very clean,,,,,,

Can I get some direction on:

1. what to look for in a recently rebuilt carb
2. where is a good reference for setup prior to installation

Any other opinions would be well received,

Thank you Teeners


YES I KNOW

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Pictures will be added later

Without part numbers it's real hard to tell what you have,as your car is relatively low mileage you should have original spec carbs still on there .
Have look @ the carbs you have and look for tell tail signs of fastener and the brass gallery plug wear which is a good indicator they have been apart .
Problem is folks pull them apart with crappy old tools .
See how you go ,cheers.
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930cabman
post May 31 2025, 06:01 AM
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clean em up and run em
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rgalla9146
post May 31 2025, 08:42 AM
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Cary
When I worked on the car 25 years ago (!) it had OEM 914 6 Webers.
When I bought the car 5 (?) ago it had those new replacement Webers.
I think the previous owner or his wife had the carbs replaced.
Rory
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ctc911ctc
post May 31 2025, 04:32 PM
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QUOTE(rgalla9146 @ May 31 2025, 08:42 AM) *

Cary
When I worked on the car 25 years ago (!) it had OEM 914 6 Webers.
When I bought the car 5 (?) ago it had those new replacement Webers.
I think the previous owner or his wife had the carbs replaced.
Rory


Hey Rory, they seemed to run way too rich but when I took one apart all is clean and new, too bad the originals were cored…..

Will recalibrate and see how it goes, thank you Rory
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brant
post Jun 1 2025, 07:08 AM
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I’m not aware of any aftermarket 3 barrel carbs made other than pmo version
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Graydingo
post Jun 1 2025, 08:29 AM
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QUOTE(ctc911ctc @ May 30 2025, 06:25 PM) *

1970 914-6 all stock


Can I get some direction on:

1. what to look for in a recently rebuilt carb
2. where is a good reference for setup prior to installation

Any other opinions would be well received,



1. general cleanliness, correct seals and washers, and of course if it runs right.
2. The defacto source for 3c knowledge when it comes to Porsche is on Performance Oriented (web site)


Familiarize your self with the best lean setup. You need to set up linkage correctly and go through all the other procedures like setting the float bowls and using the syncrometer to balance vacuum.

The car's timing, idle and carb setup are all related, if one is off, nothing runs right.

QUOTE(brant @ Jun 1 2025, 06:08 AM) *

I’m not aware of any aftermarket 3 barrel carbs made other than pmo version


As pictured above, the more rough version of the weber 3c body casting was made in the USA in the 90s by Carter which Weber purchased to try to enter the USA auto market. Recently there are Spanish version of Weber 3c as well. The early 911 Weber carbs are all made in Italy and it's stamped on the side.

Also "reedmoral by Lantech" is apparently a chinese knockoff of the weber 40 ida 3c"
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brant
post Jun 1 2025, 08:57 AM
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Don’t forget to measure and adjust accel pumps also
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914Sixer
post Jun 1 2025, 09:46 AM
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China now making replacement carbs.


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ctc911ctc
post Jun 1 2025, 07:22 PM
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Here are the pictures I promised, first, here is the model stamps of the carb

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there is some question as to the originality of the carbs - according to Carl at Klassic Automotive Training School, there is a stamp on every carb that goes through the Porsche Factory, it should be right here:

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He talks about this and much more in one of his videos, all of which are very informative,

https://www.youtube.com/watch?v=p3qwIbRdcvE&t=60s

Inside is very clean, stained in a few places, but clean.

Floats are in perfect shape, did not use compressed air to clean them.....grin

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When I opened the gasket seemed new and the interfaces were very clean.




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ctc911ctc
post Jun 1 2025, 07:25 PM
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..................Continued.................

Inside of the carb is very clean, here are a few examples.

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Question is where to start on a carb that seems to be in very good shape but needs to have all of the adjustments made.....????

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sixnotfour
post Jun 1 2025, 07:41 PM
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Not Even Italian....
Those are from PMO way back when ...Caution some had a depth problem for the Emulsion tubes,,There may be a small spacer under each E tube..

Stock 2.0 you say you have ??

spec cheater list


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sixnotfour
post Jun 1 2025, 08:19 PM
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sixnotfour
post Jun 1 2025, 08:20 PM
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ctc911ctc
post Jun 1 2025, 08:24 PM
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QUOTE(sixnotfour @ Jun 1 2025, 08:20 PM) *

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Almost matching…………huh……..are they off of the same car?
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