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| Another version of how not to build a model engine |
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| NickG:
Seeing that video it's obvious now! I have been studying Jan's engines for a couple of years now and I am so used to that petrol vapour carb that I didn't notice lack of throttle body either. Jan effectively changes the mixture to alter the speed but he is also choking the air at the same time so it's a bit like a throttle? (please correct me if I'm wrong). S , as John said you are purely changing the mixture, the throttle is full bore all the time. Looks to be running really nicely by the way. Nick |
| chuck foster:
sorveltaja : that's one sweat running little engine but as others have said you need a carb that has a throttle. i might have some plan's to build a little carb that might just do the trick for you. i will dig them out and email them to you if you like. chuck :wave: |
| NickG:
Not sure what model ones are like but I know from working with car SU carburettors they effectively have a cam on the throttle butterfly rod that pushes the needle down as you need to richen the mixture as you open the throttle. Not sure how fixed jet carbs work, number of jets that become uncovered by a rotating disc? Nick |
| Darren:
You could try a washer, or plate with a small hole to restrict the airflow. Expect to have to adjust the needle as well though. Get it going and place the washer over the intake to see if it slows down. Different sized holes should give you different speeds. Worth having a go before making something. |
| NickG:
Good point Darren. :thumbup: |
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