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Registered
Join Date: Aug 2003
Location: Phoenix, AZ
Posts: 38
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Difference in Weber Carbs?
I see three types of webers advertised consistently. The 40 IDA, IDT and IDS. What is the difference and which are the most desirable? I have a 1970 911T that I would like to buy a set of webers for. I own both of your books but have not been able to find the answer.
Thanks in advance, Christian |
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07-14-2004, 03:49 PM
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I would rather be driving
Join Date: Apr 2000
Location: Austin, TX
Posts: 9,108
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AFIK, there is not much difference betwen the IDA and the IDT other than jetting. The IDS was offered in the early (67-68?) 911s with a high speed enrichment circuit.
They can all be rejetted for your 70T. Just make sure you find a clean set with tight throttle shafts. you do not need to buy a complete set since the manifolds and linkage from your (assuming) Zeniths will work.
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Jamie - I can explain it to you. But I can not understand it for you. 71 911T SWT - Sun and Fun Mobile 72 911T project car. "Minne" - A tangy version of tangerine #projectminne classicautowerks.com - EFI conversion parts and suspension setups. IG Classicautowerks |
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07-14-2004, 03:56 PM
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Registered
Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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One thing I've noticed in the IDT carbs is that, for emissions, the profile of the idle mixture screws are different. A more normal profile would be a smooth taper to a point. The IDT mixture screws had less slope to them - more needle-like. The end result is less adjustment of the idle passage orifice size as the screw threads in or out. I replaced with IDA/IDS-type mixture screws.
Sherwood |
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07-15-2004, 11:56 AM
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