Min assembly weight effect on ET

[Kirk Morgan]

I dont know about horse power but it should help the engine accelerate quicker.

[Stan Weiss]

When I produced that graph I just used the weight stated and picked a distance from the center line and an acceleration rate.

How much does that weight change reduce the needed bob weight, or it other words how weight can be removed from the crank also?

Stan

[Signman]

When we were looking at this back when piston rod assembly weights were enacted the thought was to remove as much weight as possible from reciprocating components and bring it toward the center rotating mass. This would be just one place to work.

[Stan Weiss]

With that in mind. Remember when looking at rod weights that only the small end weight is reciprocating and big end weight is rotational.

Stan

[Adger Smith]

Depends
Rotating weight IE: crankshaft Counter weight and rod big end act like flywheel weight.
Reciprocating IE: upper rod, piston and pin and rings are a start & stop motion and absorb energy in the start and stop.
100 G off each upper reciprocating only lightens the crankshaft counter weights 100 G.
100 G. off the big end of each rod lightens each rod journal 200 G. (2 rods per journal) The end crankshaft counter weight is lightened a corresponding amount. The total effective loss of rotating is 400 G.

[Signman]

The thought was that reducing weight close to the center of rotation does not produce gains as would further out from center.

When thinking about flywheel weigh with large and small diameter which has more effect? On old machines have seen had large flywheels which stored energy better than smaller diameter. Those things driven by leather belts were effing dangerous started slow and slow to stop.