[Varn]

I bought a Renault R10 back in 1978. Rather anemic with it's 1300cc 4 cylinder. I turned up the timing to get better running but encountered a lot of pinging.

I had read about water/alcohol injection with WW2 piston driven fighter aircraft. Using that as a base I made a single stage water/windshield washer injector. I used a small electric windshield washer pump that I plumbed into a fitting on top of the airbox so that it would shoot a stream straight into the 2 barrel Solex Carb, I used a Amal carb jet that I screwed into the air filter. Initially I controlled it with a simple pushbutton switch.

Space was very limited in the car. They even put the spare tire under the hood and the muffler was in the wheel well. I didn't have any space to add a separate water container so I used the windshield washer container with a Y connector.

I used a vacuum solenoid to control a microswitch that drove the pump. It would come on when the manifold vacuum was low. To prevent it from flooding the engine when starting when the vacuum signal was low I used a relay that I set up to latch off of pushbutton switch after I started the car. If I killed the engine I turned the key off and then could restart. Once running I would reengage the relay.

I didn't have the resources to modify the compression ratio but I think I could get a bit more out ot it.