[fitsracing]

thanks for reply, the engine runs a magneto with centrifugal advance spring loaded.you are suggesting a constant flow vacuum operated WI? This was my first thought, trying too make it work on demand may be complex.which is why I contacted you
Using methanol for fuel what ratio of water to methanol should I start with? or other additive.
The water injection will have to be between the carby and the blower. the only place for vacuum operated constant flow WI.
cheers tony