Gallery, Projects and General > Project Logs
Another version of how not to build a model engine
sorveltaja:
The shutter at the carb's throat doesn't seem to solve the adjusting problem :scratch:.
Anyway, I finally got a tachometer reading, about 4100 rpm, but the engine goes even faster than that, if allowed. Mostly I have to kill the spark to stop it.
Any advices on that carburetor thing would be greatly appreciated.
John Hill:
How about a restrictor on the exhaust? That should tame the beast! :coffee:
sorveltaja:
--- Quote from: John Hill on November 15, 2009, 01:33:49 PM ---How about a restrictor on the exhaust? That should tame the beast! :coffee:
--- End quote ---
Thanks for the tip :thumbup:. I was just getting to testing it, when I heard 'crack' and the engine stopped suddenly, resulting this:
Reason was the M2 nut, that keeps the connecting rod in place. It was loosened, and finally it fell off.
So far, I haven't found any other damages.
Lesson learned: The nut only isn't good way to secure the connecting rod end.
As an alternative, I'm going to attach a bearing disk to crankcase backplate.
What comes to crankshaft, only the shaft is bent, so I'll drill it off, and replace it with a hardened 3 mm rod.
sorveltaja:
Here is the crank disk and new rod, that are to be silver soldered together:
Bits and pieces:
Another view of cylinder head and liner: From the top:
Crankcase is fastened to base with two M3 screws:
sorveltaja:
Repaired crankshaft with ball bearings:
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