Is the Puch engine really based on the Fiat 500 engine? (Ignorant question...I know, but I always belived the Puch engine to be a Steyr development)
The Steyr Puch a lot like the Fiat 500.
Same basic body, same floorpan, same front suspension.
The engine was not like the Fiat but ( from what I've heard) a lot closer to the Porsche 365 engine, but chopped in half.
So it was a 2 cyl boxer instead of the 2 inline the 500 had. ( both aircooled )
Rear suspension was different too, it was a swingaxle.