Thanks Jak, These engines are piston port type, no reed valves or anything. Its a bit of an experiment. Yes i agree it is way too big but from initial testing i think it may spin it up with enough load and distance at full throttle, The rev limit has been removed with the use of a nissan coil, so it will rev alot higher than a lawn mower. Check the first fire up vid, If you look close at the compressor it spins it with the slighest fire. When i was testing the ignition just spinning it over with a drill it was turning the compressor it easy, Im yet to fit the carburettor to the inlet of the turbo .But as i say its not meant to be super serious, I just like making stuff. Im a fitter Machinist.
YouTube - Victa 167CC TURBO ignition test and first kick