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

Update: had a few min to play some more tonight!...I peeled the tape and added a Second row of weights, putting me up to 17oz of total weight added. It started just fine and ran a bit slower rpm but hit more often because every time you slow the engine the springs need to get softer as less centrifugal force in play....rather than make a new rubber spring....I decided to go BIG or go Home! Added a 3rd row for 27oz! The wheels are getting noticeable larger so they accepted 10 oz on this pass...I made a rubber spring that was quite slack and to my surprise the engine Started!....I am now average 34 to 36 hits per min...but the engine does a double hit about half the time...so if was a Strong hit it coasts quite well....on a double hit cycle the first hit is weak and so the Stronger second hit really gets the flywheels spinning...I am curious if I added a one way check valve in the fuel line if I would get more "strong" hits?...kinda wondering if during the longer coasts I am now getting if the fuel can creep back from the carb a bit...something more to test I guess.
   Think this is as far as I want to go with added weight, unless the check valve fixes the double hit issue. As always advice is Welcomed! I will be trying a deeply dished piston quite soon!