Nothing to do with Tractions but here is my Project Thread for my Renault 4CV Gordini project.
Basically bought the engine in Cardiff this past April all in bits, so now cleaning and rebuilding. Very similar to the Traction engine but tiny, so much easier to handle when you can just lift it by hand. The little 850 Gordini will double the original power from 20 to 40 bhp. Hence also changing the front drums to larger Dauphine drums. Plus strengthening the handling of the rear wheel drive as this car is destined for a little regularity rallying 🙂
Adding new stuff each day and it is an open forum 😉 .
http://renaultccc.proboards.com/thread/3150/pyrenean-55-4cv