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500 (Classic) Ducati powered Fiat from California

I have taken on the crazy task of trying to stuff a Ducati 1100 air cooled L-Twin engine in the back of my 1974 Fiat 500R, and solving all the challenges that will arise because of it!

Introduction

Hello everyone! As the title suggests, I have decided to build a Ducati powered Fiat 500!

I have restored a couple classic American cars, some motorcycles, and have designed and built a handful of Formula SAE cars in college, but I've always wanted to build my own motorcycle powered road car.

After a decade of working at one of the largest Spacecraft companies in California, I decided to take a break and try to make this dream a reality. The car needed to be simple, lightweight, relatively cheap, and older than 1975 (California smog requirements). I have a buddy that did this with an old Honda S600, and another with a Fiat 850 spider, but I wanted to do something a bit less roadster-y. Then, as the wife and I were honeymooning in Italy, I saw the answer: the old Cinquecento.

There seems to be lots of motorcycle powered 500s for hill climbing, and Z-Cars is one of the most popular swaps out there with their Suzuki Hayabusa swapped "Fiabusa" (they also make a Subaru swapped "Fubaru"), but I wanted to keep the motor air cooled (no big radiator up front) and Italian. After a bit of research, I decided to go with my favorite motorcycle engine, a Ducati 1100. The last of the big, air cooled, dry clutch L-Twins. How hilariously adorable would this car be with that noise coming out of it?

I spent a few months looking for the perfect car - something that was driveable, in decent shape, but not too nice, so I could save money up front and put it toward the swap. I ended up with a clean-ish 1974 Fiat 500 R with about 26,000 km on the clock that had been imported into the states a few years prior. The body was in pretty good shape until a strap broke towing it home resulting in a head on collision with the trailer. I minimally repaired the damaged area so I could turn the wheels full lock again, then drove it around a few months until I got the car registered.

Now that the car is legal, it's time to begin the project!

I'm looking forward to sharing the progress and hearing everyone's thoughts on the build. I have reached out to a few people individually and everyone has been extremely nice and very helpful!
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That's interesting, I haven't heard of Ducati working with Fiat on this. I know Moto Guzzi had a proposal, but ended up not going through because Fiat didn't think Moto Guzzi could keep up with demand. More about that here:



I had originally looked at doing a Moto Guzzi and VW option (would have packaged nicer) but I'm too much of a Ducati fan boy having owned 3 of their motorcycles!

You are correct, it was Motor-Guzzi and NOT Ducati----but it would still be very interesting to see how they fitted the engine and what transmission they proposed to fit. I have seen the result of a VW engine fitted into a 500 when I was at Radbourne Racing.The car was called "The Little Red Rooster" and (I think it was) 'Hot-Car' magazine did an article on it---it was not a pretty conversion---the VW enine is just plain too big.
 
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