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40 WEBER Carburetors 40IDTP3C Made in Italy
Please Note:Carburetors are missing some small parts, those are not difficult to source and still available from several sources, including some members of this board.
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Some helpful comments by Paul Abbott</SPAN> of Performance Oriented</SPAN></SPAN>
40IDTP3C and 40IDTP3C1 Webers were OEM for the 1969 911T and were also used for 1970 and 1971 2.2 911Ts for "Rest of the World" market. They differ from IDA type Webers used on earlier 911s in that the progression circuit is tailored for small main venturis and mild camshafts.
It is possible to reconfigure these types of Webers to be suitable for use on any 911 engine through 3.0 liters. The reconfiguration effort would require a complete jetting package update (jets and main venturis) plus a change in the idle air bleed size. The idle air bleed is a non-tune-able item but depending upon your Weber specialist this can be easily achieved. Another reconfiguration would be the installation of new throttle plates of a different ellipse angle to help offset the unique progression circuit design of these carburetors.
Looking at Photo 16 of this set of pictures reveals a slight carbon blush on the throttle plate near the end of the throttle shaft on the right. This carbon blush indicates a throttle shaft bushing clearance that allows uncontrolled ambient air to be drawn into the low pressure area below the closed throttle plate which causes erratic idling issues. This issue is easily repairable during a re-manufacturing process and will result in carburetors with as-new idling and fuel delivery characteristics. Again, discuss this issue with your Weber service specialist.
Otherwise these carburetors look to be in good condition and would serve the user as a good base to creating excellent performing Webers with the "period correct" appearance that is desired in early 911 and 914/6 applications.
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