Dual Weber IDFs
and the
DOHC Spider Engine

Welcome 

If you are reading this you have been seduced as so many others have by the visual, audible and of course the seat in the pants appeal of the dual carb installation on the Fiat 124 Spider. The carbs are both functional and beautiful additions to your 124 project.

The installation of this worthwhile modification to your car, unlike some other changes you might make, will have almost no negative aspects, other than a modest drain to your restoration budget. Unlike some American muscle car induction modifications, you will notice no driveablility problems and your mileage, if you care about such things, might even improve depending on your driving habits. You will also have four large tubes that will swallow a silver dollar. One for each of your cylinders. This much carburation on so small an engine with almost no bad manners is quite an engineering feat. You stand to reap the benefits of the engineering and experience of some of the worlds best experts in carburation and some extremely talented owners who have volunteered their ideas and cars to help you with your installation.

What are they Like?

I've lived with dual IDFs on my Fiats since 1974 and can testify to their day to day docile behavior. And to their performance. They probably add as much to the "driver's performance" as they do to the engine. The sound of all four chokes opening up and the intake roar is music to any driver's ears. Alan Lofland calls it their Varoom, Varoom, appeal. They can sound just a good as they work.

Every effort will be made to give you pictures and information that you may need to decide what kind of installation you might like on your car. I'll even put in a couple of words for some nice single carb and fuel injection systems for you to look over before you make your decision.

Well... I'm probably preaching to the choir, so lets get on with some reinforcement for those of you that are either borderline decision makers, have maritial problems, or would just like some herd reinforcement (there are a bunch of us out there already enjoying the benefits) with some useful information. I'll try to include as many engine types as I have information available to me. So if you are trying to do this with a 2L or a 1438, there will be something in it for you.

As all information you might encounter on the internet. This information is only a guide and the opinion of the author and the various participants. It is up to you to determine your capabilities and the appropriateness of this modification. If you have doubts about your abilities or your facilities to complete this project please consider this guide to be entertainment. I don't want to hear how you burned your house down because I didn't tell you to connect and tighten up the fuel lines before you attempt to start your car. Please use some common sense before attempting this project and make all of the necessary preparations. Buy a good repair manual and follow all of the recommended safety suggestions. Remember, this is a hobby.

This project will be put up in sections as my marital status allows. So with no further ramblings, here we go.

Continued

Basic Installation

IDF Linkage Detail

   Care and Tuning