Intake, Combustion and Exhaust Modifications FIAT Twin Cam Engines

1975+ model year Fiat 124. This heater pipe … Our deviant from the manual/water choke fold is the electric choke DFEV, … on the 1608cc 124 Sport Spider. …

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Intake, Combustion, and Exhaust Modifications FIAT Twin Cam Engines Second Edition – July 2004 Intake, Combustion, and Exhaust Modifications FIAT Twin Cam Engines Second Edition – July 2004 Brad Artigue a mirafiori.com guide Contents Introduction What’s in Your Car Performance The Baseline Exhaust Systems Tuning Single Carburetors Dual Carburetors Weber IDF Diagrams Weber ADF / ADFA Weber ADHA Weber DFH Weber DMS / DMSA Identify the components that are actually installed in your FIAT. Define performance in terms that make sense and prepare for modificationsthat suit your performance needs. Establish a baseline of how your car performs with the current equipment.Determine if you need to alter the existing configuration or simply fix whatyou have. FIAT installed a variety of exhausts on their vehicles. Some systems arequite good, others are restrictive. A reference on how to reset and tune a single carburetor Installing Dual Webers can be a real kick in the pants. This section dealswith the Weber IDF series. Diagrams Diagrams Diagrams Diagrams Intake and Carburetion FIAT installed a variety of exhausts on their vehicles. Some systems arequite good, others are restrictive. 3 4 7 8 9 10 18 19 23 25 27 30 31 If you own a FIAT Spider then you own a wonderful car. Superb handling, beautiful styling, easy to workon, and inexpensive to own, Spiders are a hobbyists dream. I have owned several Spiders in theprevious decade, all but one were carbureted. During the time that I was restoring each of these cars Idid a lot of work with various carburetors and manifolds, trying to get as much performance as possiblefrom off the shelf FIAT parts. The results of this work are published in this document. It is an unofficial document, FIAT no longerreally supports the Spider (it p o r The first edition focused on the carburetion, intake, and exhaust system. That work has been expandedand now includes schematics for the various carburetor types. A new guide is also available for FuelInjected Spiders. (c) 2001, 2004 Bradley Artigue. All Rights Reserved. This guide is freely distributable in electronic format provided it is distributed in the original form.Images are scanned with has been out of roduction for almost 20 years), and is really a c mpilation of years of work enjoying these fine ca s. Welcome to the Second Edition Changes from the First Edition This edition contains new features and diagrams and several corrections. The support for this documenthas been overwhelming and I hope you continue to enjoy it. If you have the first edition you may havenoticed the addition of ” ” on the cover. Mirafiori is an enthusiast driven website (www.mirafiori.com) for FIAT owners. It is an invaluable resource and is a rarity in the automotive world- an online resource that you can actually use with ease. Eli Caul (isaac@mirafiori.com) hosts the siteand deserves an enormous pat on the back for the effort. a mirafiori.com guide Copyright Information 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 engineand carburetion systems. My personal experience is with the 124 Spider but the information in thisdocument m

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