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Post by jonnysnatchsniffer on Apr 25, 2022 10:06:19 GMT
ok then, ive been wondering what it is that twists the crank on the pin when you have not had a seizure and you have a light 1kg flywheel i cant get it into my head, as for me, the piston pushes the rod down onto the pin, most of that force is transferred to the drive side and some is driving the flywheel, now i cant see how the thing twists unless one side or the other is made to slow down whilst the other carries on, like when you seize it at 7000rpm could it just be high rpm?
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twisted
Apr 25, 2022 12:10:59 GMT
via mobile
Post by tzsteve on Apr 25, 2022 12:10:59 GMT
Ive had a couple of cranks that press together with about 3 tons and others that take over 5 tons to press together, So i guess the fit of the pins can be good or crap,
And as you imply its the momentum of the various parts when accelerating or slowing the engine that causes the webs to move. One thing that also adds a pull on the crank is the power going into the electrics i guess you are using a modern system that does not just dump power to earth ( 50 watts of dumped power is 50 Nm per second quite a bit of drag on the fly wheel )
No matter what the dealers say these are scooter parts designed for less than 10 BHP and as we all know many dealers really dont give a fig what they sell.
Frustrating isnt it,
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