Intake, Combustion, and Exhaust Modifications

If you own a FIAT Spider then you own a wonderful car. Superb handling, beautiful styling, easy to work on, and inexpensive to own, Spiders are a hobbyists’ dream. I have owned several Spiders in the previous decade, all but one were carbureted. During the time that I was restoring each of these cars I did a lot of work with various carburetors and manifolds, trying to get as much performance as possible from “off the shelf” FIAT parts. The results of this work are published in this document… It is an unofficial document, FIAT no longer really supports the Spider (it has been out of production for almost 20 years), and is really a compilation of years of work enjoying these fine cars. This document is intended to explain the various carburetion systems used by FIAT on many FIAT and Lancia vehicles sold between 1966 and 1981. The most popular (and abundant) of these vehicles was the Fiat 124 Spider, but many other cars shared the same engine and carburetion systems. My personal experience is with the 124 Spider but the information in this document most likely includes your vehicle if it says “FIAT” or “LANCIA” on the outside and there is a belt-driven twin cam engine with a carburetor on the inside. FIAT used Weber as the primary source of carburetors throughout the 60’s and 70’s. Underneath the hood of your FIAT is most likely a dual-barrel progressive downdraft carburetor (these terms are explained later). If your car is truly a European specification then you might have two dual-barrel synchronous downdraft carburetors. You may also have Solex carburetors or Dellorto depending on which manufacturer was on strike when your car was assembled. If the above paragraph confused you, don’t let it. In the next section you will identify just what you have on your car (because it may not be the original). In the third section we will discuss what you might need (vs. what you might think you need). The fourth section covers selecting the right manifold and carburetor, and the fifth and final section discusses tuning your Webers for optimum performance. Be forewarned: if you intend to run a set of Solex, Dell’Orto, or some other setup then this document won’t be much help. This document speaks specifically of Weber carburetors on FIAT engines

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