Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Thanks Nick and Gil 

As if i did not have enough brass splinters in my hands, i had a go at making a new carb today with a variable size venturi so i could get a nice speed when not in hit and miss mode.  Funny enough i was sipping coffee and thinking of a plan and fuel started dripping from the sight glass on the tank, well no big deal it was coming off anyway, but it turned out the piece of perspex supplied for the sight glass melts in petrol...very good!  lucky my mate had a sheet of 2mm glass so i could make a new sight glass.

Once the sight glass was fixed i got back to plan A and started of by making a throttle slide and needle



Then a stand alone venturi and fuel tank mount/fuel pick up



The idea being the venturi as an assy. will be easily removable from the carb body to make mods easier



Next came a complete new carb body and refitting back to the engine for test



It suprisingly worked pretty well considering the needle taper was just a guess



I could find a nice off governor speed and then turn on the governor and have it run all without adjusting the mixture needle.  Just got to think of a method of adjusting the slide without holding it with my poor splinter infested fingers 

Ade