ORIGINAL: Recycled Flyer
ORIGINAL: 123Cat
I was flabergasted , it has a circular counterweight , no attempt to balance and a really thick piston , it ran OK , but I will try a rebuild , and hope for the best , now can you make a piston from very hard wood ?
What is the ignition temperature of Jarrah
The ignition temperature of Jarrah hard wood is 425ºC but what wood worry me more is its coefficient of friction outside of a low temperature heavily greased environment.
Anyway the full circle crank web can be dealt with very easily by scalloping out the metal either side of the crank pin and I am wondering if simply shortening the piston skirt for lightening might work, sub piston induction aside.
If the crankpin area is strong, you could cut a lot of weight off the crank. This is a pair of cranks from a .28 1/8th scale car engine.
Crank on the left is stock, The one on the right I modified slightly. The engine gained about 500rpm from this mod. I have some more changes to make on the crank so it balances better. There was no difference in engine vibrations stock vs. modified.
