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Any one really know how to balance our engines?

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Old 07-20-2007, 01:11 PM
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PAPE
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Default Any one really know how to balance our engines?

I have serched and discused this many times and its like every one has a diffrent way to balance one piston 2 strokes, but does any one know how to do this the right way???

lets say you lightened your piston changed your crank modified your flywheel and run a home made clutch, the engine has to be out of balance so how do you go about this?
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Old 07-20-2007, 09:22 PM
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Default RE: Any one really know how to balance our engines?

it is impossible to balance a single cylinder engine from primary (the fuel burning ) and secondary (the weight of the moving parts) imbalance, the most balanced engine layout is a boxer engine (the boxer isn't perfect either but it is the best for a smooth running engine), but for a single cylinder you will never get it perfect, the best you can do it use a balanced crank shaft to try and correct the weight of the moving parts, but you wont correct the primary imbalance with a single cylinder.
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Old 07-21-2007, 09:30 PM
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Default RE: Any one really know how to balance our engines?

Lighten the riciprocating mass and balance the flywheel on it's own, that is all you can do. Three bearing crankcase's can help too.
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Old 07-22-2007, 06:09 PM
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Default RE: Any one really know how to balance our engines?


ORIGINAL: MrMikeG

Lighten the riciprocating mass and balance the flywheel on it's own, that is all you can do. Three bearing crankcase's can help too.

so basically get the riciprocating mass al light as possible and a well ballanced flywheel I can understand that but I know there is one ryobi engine used for plane conversions that when you balance the fly wheel the hole engine shakes really bad because it uses a counter weight on the fly wheel.

I think it impossible like ttoks sais but there has to be a way to come close
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Old 07-22-2007, 06:42 PM
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Default RE: Any one really know how to balance our engines?

you can buy balance cranks for 23 and 26 engines
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Old 07-22-2007, 07:06 PM
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Default RE: Any one really know how to balance our engines?

Nobody can just balance the crank without your piston, it is a sales gimick.
Pape, yes make the pistons as light as possible and balance the flywheel. I can get the pistons down to 20 grams but they are really thin, most of mine end up about 22-24 grams. The Sikk pistons are even heavier from Stock.
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Old 07-22-2007, 10:31 PM
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Default RE: Any one really know how to balance our engines?

am going for the dremel now just to have an Idea how much do the stock g26rc pistons weight stock befor grinding them down?
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Old 07-23-2007, 12:07 AM
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Default RE: Any one really know how to balance our engines?

sorry I got that wrong the stock crank is balanced for the 23, you can get a crank that is balanced for a 26
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Old 07-23-2007, 12:18 AM
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Default RE: Any one really know how to balance our engines?

I can't remember Stock weight, 27 grams sticks in my head for some reason though. They are cast for 2 rings, so the thick area under the single ring can be removed. Measure on the outside to see how deep you can go on the inside. I set my dremel bit's length on the outside to the chuck, then I know I can't go too far. Don't mess too much with the pimple in the middle, it is the back side of the hole in the dome. Also the ring pin is pressed in, if you go to deep you might hit it, nothing to worry about but don't let it get loose! You can shape the area around the wrist pin to line up with your transfers too, it's all about flow through the transfers! [8D]
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