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counterbalanced crank

J

johns

Member
Just curious what the advantage is? How does it benefit an antique pulling 4500-8500# classes
4-5mph? Thanks in advance.
 
If you was on a 4 swing, swing set. One on each end trying to swing opposite each other so the swing set didn't turn over. Wouldn't it put a lot of torsional stress on the swing set? So then you move right together. Stands to reason the swing set would be stronger and last longer.
 

A Non-Counter-balanced 3-Main bearing engine was fine for low rpm "average" power levels..

Increased RPM magnifies the Stresses on the crankshaft and engine block, mainly due to the crank NOT being counter-balanced.

The engine does not "shake", because the reciprocating weight of all the components roughly oppose each other, but the imposed stresses internally are significant.

Think about the external Counter Weights on any JD 2-Cylinder flywheel and Clutch-Driver, to counted-balance the internal reciprocating weight.
There IS a lot of imposed stress on the ends of the crankshaft (at operating speeds).
Now, IF there were enough room for Enough Internal Counterweight to oppose the piston/Rod weight, those external counter-weights would be gone and the engine be more capable of making increased HP and operate at higher RPM without pulling itself apart..

Ron.
 
wouldnt it be cool if swing set would go all the way around like a engine, the emergency room would be busy then on first day of school then
 

Depending on what type of balancing we are talking about . An inline four cylinder is inherently unbalanced unless a balanced shaft is used.
A three cylinder , a five cylinder a six cylinder etc will inherently balance.
As previously stated the ideal location for counter weights is half of the weight on each side of the crank's connecting rod throws.
 
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