Weber 40 IDS question

[68S_SK2]

Are the Weber 40 IDS velocity stacks made out of plastic or metall?
What is the original configuration for a SWB 911S? When was it changed?

Thanks in advance.

Claudius

[ttweed]

My IDS carbs have metal velocity stacks.

The original configuration for the SWB 911S included 40IDA-3C carbs, same as the Normal version, but with larger venturis and jetting for the hotter motor. From engine serial #960502 on, the 911S used the 40IDS-3C carbs, which had the added high-speed enrichment circuit to provide a richened mixture at high RPM to minimize the possibility of detonation.

If I remember correctly, the 2.0S carbs originally had 32mm venturis, 130 main jets, 180 air correction, 55 idle and F3 emulsion tubes, if that is what you mean by "configuration."
TT

[rick2]

Both my 67S and 67 Normale have metal. I just bought an extra set of carbs from Rob Laverty and they have plastic, he said they were from a late 67. I have a set of plastic that I remember coming from a 71T.
Rick

[68S_SK2]

Thank you Tom and Rick!

Sorry for the confusion, but my question was originally focused on the material of the velocity stacks - metal versus plastic.

I have got both too, but what is original for an early SBW car??

Claudius

[ValveFloat]

5 of mine are plastic.
I assume the originals were plastic and one was broken and replaced with metal.

[Richard]

Metal.....

[68S_SK2]

It is looking like half and half - plastic and metal....let´s make a poll?!

As far as I know it was changed in 1971, but I have now idea whether metal was first or the other way round??

It seems to be a difficult question!

Who knows??


Claudius

[NZVW]

Bump to see what eventuated
Mark

[Jon B]

Bump to see what eventuated

I seem to recall the 67s being plated metal, and the 68s being plastic. Paul Abbott will know.

Jon B.
Vista, CA

[flat4manbe]

Hi,

Indeed, my 68 2.0S have 6 plastic ones.

Regards,

Fred