Flywheel feature help

[sshire]

Help me understand the purpose of this recess on the Farmboy flywheels. It is to be done on both the governor side flywheel and the non-governor side. I'm guessing it's for balance but I can't see what would cause an imbalance on the non-governor side.

[Dave Otto]

To help balance out the reciprocating weight of the piston and rod also the throw of the crank shaft. I understand on a single you can't balance all of it out, but you can remove a portion of the imbalance.

Dave

[sshire]

Thanks so much, Dave. I was so fixated on it having to do with the governor that the other parts hadn't entered the equation.
Learn something every day.
I spoke with Maury yesterday. He's planning on joining the rest of the usual suspects at CF. Love to see you there or at NAMES some year.
Thanks again for the help

[maury]

Stan, the balancing grove should be the same on both flywheels. If you do all the axial balancing on one flywheel, the engine will tend to rock on the axis of the bore. Remember, you are really balancing a 3 dimentional object.

maury

[sshire]

Thanks Maury
The drawings show the same feature on both flywheels. When the flywheels are mounted on the crank, should the grooves be opposite each other (i.e. Both at "12:00")?

[Jasonb]

Yes both in the same position, think of them like balancing weights on the webs of a crank, you get one either side of the pin but they are in the same position

If you position them bothin relation to the keyway then assuming the keyway is on the same side of the crank you should not go wrong

[sshire]

Thanks. I understand. Appreciate all of the help. Now I can haul the rotary table into the BP and mill the recesses. That, and the keyways in the crank, should be the last machining.

[ChipMaker]

Stan, if you really want some real flywheel fun, pick up a full size Hit-N-Miss engine, about a 1-1/2hp is just right!  I have a 1927 Economy 1-1/2HP Hit-N-Miss engine that I bought years ago at the annual Portland, IN (May) swap meet.  It is a ton of fun, my brother-in-law, has several and we take them to various antique engine shows and run them all weekend on just about a gallon of gas or so!  We like to belt them up on various goofy objects that we can come up with and the spectators love it!  Karl, ChipMaker

[sshire]

Karl
Sounds like fun.
Videos?