Zenith on 914-6 |
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Zenith on 914-6 |
DennisV |
Aug 18 2022, 07:13 AM
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#1
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Member Group: Members Posts: 468 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California |
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:
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914Sixer |
Aug 18 2022, 08:14 AM
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#2
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
Parts is the biggest problem. Personally I like them. Not sure but I think Porsche Classic has reproduced some of the parts. You are correct on problem areas.
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Retroracer |
Aug 18 2022, 09:39 AM
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#3
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Senior Member Group: Members Posts: 612 Joined: 7-July 13 From: Bend OR Member No.: 16,100 Region Association: Pacific Northwest |
Parts is the biggest problem. Personally I like them. Not sure but I think Porsche Classic has reproduced some of the parts. You are correct on problem areas. (IMG:style_emoticons/default/agree.gif) The TIN40s are essentially "bolt on" compatible with the Webers - throttle linkage, manifolds, air filters etc - but you may have to optimize the jets to run with the 2.0 (if the carbs were from a 2.2) and the modern fuels we have available. Idle and main jet options are easily obtained, but some of the parts can be tough to source. For instance, the eccentric cam roller bearing that activates the acceleration pumps was seized when I got my carbs, and I could not find a source for a new one at the time. So I had some machined up. Properly rebuilt and set up, they have proven very stable and reliable, FWIW. There's some good online info about setting the floats on reassembly, and of course, check float levels and such like you would a Weber and you should be good to go. Interesting call on whether to fit "what's on hand" (ie. the Zeniths) or spend the $$ and replace with the correct Webers. If its an original 6 - with values buoyant as they are - it might be worth searching for some Webers and just sending me the Zeniths to use as spares.... ;-) - Tony |
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