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Victor Aviation Service, Inc. Precision Aircraft Engine Overhaul
Demanding Maximum Performance & Longevity
1 (650) 354-1399
FAA Repair Station #BJ3R399L
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Real-Time Reciprocating Engine Balancing

Engine thrust may be increased by reducing the amount of power wasted in attempting to offset counterbalancing forces induced by out-of-balance internal components.

Reciprocating mass is made up of the piston, piston pin and plugs and the upper half of the connecting rod assembly. Improving reciprocating parts balance allows the engine to deliver more power to the propeller, and the engine becomes more efficient with less wear on internal moving parts. "Power By Victor"™ Black Edition Engines™ are balanced in reciprocating mass weights to one gram, not only in individual parts but also in cumulative reciprocating mass weight to provide for improved engine longevity and smoothness.

When we balance an engine, not only are opposing reciprocating masses balanced within one gram, we balance the engine's front and rear mass assemblies in the same fashion. Don't be fooled by other companies that say they are balancing an engine by installing balanced pistons and rods, because only the upper half of the rod assembly and accumulative upper end weight applies in real-time mass movement. This requires very sophisticated equipment and specially trained machinists to properly correct.


Rotational Engine Balancing

Rotational mass balance is another dimension of balance used by Victor technicians. This differs from reciprocating mass balance, as this is only the movement in the rotational direction as the engine propeller turns. This mass is made up of the crankshaft, counterweights, gears, and large end of the connecting rods, connecting rod bolts and nuts and factored for oil weight.

When engines are originally manufactured they are built using theoretical balance procedures. This assumes that when the parts are put into motion, that they will remain balanced. In real-time operation under load, the balance changes and effective balance takes over. Over a period of time, such imbalance could crack engine mounts, crankcases and exhaust systems, cause premature bearing failure and propeller overloads, result in increased engine temperatures and induce vibration in the cockpit.

Additionally, an engine imbalance can introduce harmonics in flight controls, instruments and airframe members and is one of the leading causes of premature engine wear. Balancing not only improves thrust but also reduces pilot and passenger fatigue by lowering the amplitude of various vibration frequencies generated by the engine.



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