 Larger Venturi for Zenith TIN40 on a 2.4L? |
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| Tdskip |
 Oct 21 2025, 04:25 PM
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Advanced Member  Group: Members Posts: 3,747 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None 
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The 74 914/6 build has a 2.4 L MFI engine in it that came to me running Zenith 40 TIN.
I spoke with a Zenith specialist and he said that a 34m Venturi would be a bette match for that engine displacement and it’s an easy change to make along with some jetting changes etc. This seems a whole lot more cost effective than going to Weber 40ida that are $3,000 +/- just for cores. Anyone here have experience with this they can share? Thanks! |
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| rgalla9146 |
Oct 22 2025, 07:22 AM
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Advanced Member Group: Members Posts: 4,832 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None
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Quick edit here. The 911 T in 1973 changed mid-year from MFI to CIS fuel injection. I'll bet your engine has Zeniths on it because the original CIS was not operating well or parts were not available. The engine type can be found on the flat surface to the right of the fan housing and down by the engine tin. Should be 911/ 51 (T) 52(E) 53 (S) or 911/ 91 or 96 for CIS |
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Posts in this topic
Tdskip Larger Venturi for Zenith TIN40 on a 2.4L? Oct 21 2025, 04:25 PM
930cabman I have twice overcarburatored Porsche engines. Onc... Oct 21 2025, 05:53 PM
Superhawk996
I have twice overcarburatored Porsche engines. On... Oct 21 2025, 07:08 PM rgalla9146 All three 2.4 engines came with MFI. Do you know i... Oct 21 2025, 07:33 PM Tdskip Thanks for all of the responses.
Not looking to ... Oct 22 2025, 04:43 AM Ninja
Thanks for all of the responses.
Not looking to... Oct 22 2025, 09:19 AM Superhawk996
New (old) member here. My last member name was t... Oct 22 2025, 11:54 AM porschetub
The 74 914/6 build has a 2.4 L MFI engine in it t... Oct 22 2025, 04:14 PM Tdskip Thank you very much for the posts and additional c... Oct 22 2025, 10:07 PM sixnotfour 911/57 2.4 Zenith Carb 32,32 1972 2.4 911T, Euro v... Oct 23 2025, 01:08 PM rgalla9146
911/57 2.4 Zenith Carb 32,32 1972 2.4 911T, Euro ... Oct 23 2025, 05:25 PM |
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