Zenith on 914-6 Options

[DennisV]

What are the challenges with using Zenith 40 TIN carburetors on a 1970 914-6 engine?

My understanding is Weber 40 IDTP would be the correct original carb. I also understand that 1970 911T came with this model of Zenith. So in theory, no problem?

We are trying to decide if we should rebuild these Zenith. If they are essentially same fit, form, function as the Weber, we will probably keep them. If there is some domino effect of now that you're using Zenith you also need to replace / modify x, y, and z, then we will probably try to source some Webers.

Thanks for sharing your experiences.

P.S. Would I be correct in understanding that the key concern when evaluating the carbs for rebuild would be:

1. Throttle shaft bearing wear
2. Floats that leak

[porschetub]

What are the challenges with using Zenith 40 TIN carburetors on a 1970 914-6 engine?

My understanding is Weber 40 IDTP would be the correct original carb. I also understand that 1970 911T came with this model of Zenith. So in theory, no problem?

We are trying to decide if we should rebuild these Zenith. If they are essentially same fit, form, function as the Weber, we will probably keep them. If there is some domino effect of now that you're using Zenith you also need to replace / modify x, y, and z, then we will probably try to source some Webers.

Thanks for sharing your experiences.

P.S. Would I be correct in understanding that the key concern when evaluating the carbs for rebuild would be:

1. Throttle shaft bearing wear
2. Floats that leak

I rebuilt mine a few years back with all new parts needed and sourced these from Alfa1750 on ebay ,back then there were some parts they didn't list,but asked a question and they had them in stock...very good to deal with.
Check their current listing and you will find there is very little parts they don't have now as they make and stock more parts as time moves on.
Best to give the carbs a basic clean then make sure you can get them apart first,like any carbs that have been sitting some jets,screws and plugs could be stubborn to remove,and lastly take your time ,think I spend around 20hrs on mine ,well worth it.
My throttle shafts passed inspection ,floats failing ? ,haven't heard these are an issue but replacements are able to be found from Alfa1750 also.
In summary a good carb if setup correctly and IMO you will have a hard time finding the original IDT Webers as they weren't made in large volumes unlike the IDA's,end of the day its your car and your $$$$ ,good luck.