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| Another version of how not to build a model engine |
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| NickG:
Sounds great. Is a compression ratio of 3:1 high enough? Can't wait to see more. Nick |
| sorveltaja:
Thanks for replies. An overview of the engine's construction: Base is 5mm aluminum; crankcase and cylinder head are both machined from solid alum. Cylinder liner's material is some sort of stainless steel. Easily machinable though. I used plenty of time, when lapping it. Glad I did. --------------------------------------------------------- Pearlitic cast iron is used for the piston. It has no oil grooves or piston rings, as it provides nice tight compression without them. Even without any oil. It's the material that I highly recommend for pistons/cylinder liners for low-power, slow running engines. No wonder, that Jan Ridders prefers to use it on his engines... ----------------------------------------------------------- Carburetor on the left side is third or fourth version. Needle is from an ancient .10 glow engine. It still needs tweaking, maybe a new one(fifth version). Tried to make the needle system myself, but lack of lathe's top slide prevents turning any decent taper. Currently, carb's throat size is 1.2 mm. Engine runs with that, but only at (too)fast speed. Positive thing is that no parts were flying out, when it cranked :clap: . Testing different carbs with different throat sizes has gave me a hint of what the engine likes. Next version of the carb will have 0.6 mm throat, as it's the smallest drill size, that I have. If it's no go, then drill it to 0.7 mm, and so on. ---------------------------------------------------------------- Sharp eyes might notice, that left side (inlet)valve doesn't have a tappet. Currently it's spring-loaded, as I ruined inlet cam by over-filing it. ------------------------------------------------------------- To be continued.. |
| chuck foster:
very interesting build :thumbup: you can spend allot of time trying to find the right combination of parts.............but when you do :ddb: :ddb: :ddb: please keep us posted and let us know how it all turns out :clap: :clap: chuck :wave: |
| NickG:
Brilliant effort. Well done for getting it to run. :bow: An IC engine is not far down my list of projects as it is something I have yet to do. Nick |
| sorveltaja:
Thanks for kind comments. The engine ran today, and I was going to shot a video of it. But the breaker points failed again. I'm going to replace them anyway with proper ones, that's used on cars. I've ordered few sets of those, and expect them to arrive next week. |
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