I'm in the middle of learning about weber carbs so I can tune mine properly. When I was checking the model numbers I noticed they're slightly different - I have one 40IDS3C1 and one 40IDA3PC.
From what I can find, the first came off a 67-68 911S and the second is off a 68 911 or 911L.
Other than the different model designation codes are these essentially the same carb? I'm guessing they are, but would have originally come with different jets to match the different performing 2 liter engines.
One thing I might do is to go on the Early S Registry and place an ad explaining you have one IDS weber and you would be willing to trade it for a perfect (and matching) condition IDA.
http://www.performanceoriented.com/weber-design-variations-1/
I have a spare Ida. But run ids carbs. I would trade you and pay the difference
The ids carbs have a high rpm enrichment circuit to fatten the mixture above 6000rpm
Thanks Mark.
Brant, thanks for the info. Let me educate myself a little more first - I'm new to carbs and want to understand what I have and how it relates to the engine in my car before I make any decisions. If I do decide to swap it out you'll be first on the list.
Yes you are correct. The 40IDS3C and 3C1 (one is left side and one is right side) are from the '67S (USA), '68S (Europe). It's essentially a standard 40IDA but has an enrichment circuit on the top. Look down the intake, see a little tube pointing down to the venturi? That's what makes it different from the IDA.
I had a '67S once and that's where I figured that out.
On this page IDS carbs are in the level 2 and 3 pic's.
IDS carbs has the little kitchen faucet looking tubes, they are what Brant is talking about.
http://www.performanceoriented.com/weber-40ida3c/
Attached image(s)
Thanks guys! A wealth of information, as usual. I'm guessing the IDS has had the enrichment circuit plugged - wouldn't it effect performance if the two were different? I'll take a closer look this afternoon and report back on what I find.
Looked inside the webers today. No squirters in the IDS, in fact the pair look exactly the same. These two shots are of the IDS:
http://s2.photobucket.com/user/bahama68/media/Mobile%20Uploads/image_zpspah1kw9u.jpg.html
http://s2.photobucket.com/user/bahama68/media/Mobile%20Uploads/image_zps3epd1are.jpg.html
And here's the IDA:
http://s2.photobucket.com/user/bahama68/media/Mobile%20Uploads/image_zpssrhr55td.jpg.html
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