Victor-Aviation Unique Engine Overhaul Features & Processes

Inertia Supercharging
Air Flow Optimization

Inertia supercharging is a process to maximize the volume of air trapped in the cylinder for combustion by precisely timing and delivering the proper charge of air.

This phenomenon takes advantage of the natural dynamic effects and inertia of the air during the intake cycle.

Engine RPM, cubic inch displacement, and air flow are related factors that are evaluated to help determine proper engine performance and horsepower which contribute to the inertia supercharging effect.By maximizing the kinetic energy of the air flow into the cylinders with the inertia supercharging effect, the volumetric efficiency is improved and also engine power.

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Isotropic Gear Surface Finishing

Engine parts are manufactured using grinding and cutting methods that can cause high surface roughness or irregularities in metal surfaces causing an anisotropic surface. This means that the surface irregularities of the parts all run in the same direction. These grinding marks can also interfere with non destructive testing of a part’s surface. This F.A.A. accepted process enables technicians more reliable test indications when testing parts. Isotropic surface finishing means that the part has been surface finished, or honed, to obtain a surface that has no discernible pattern thereby reducing friction, heat, noise and reduces contact fatigue. By exposing internal engine parts to a series of improved surface finishing techniques, these surface roughness problems are reduced resulting in longer parts life, smoother parts operation improved lubrication and better fuel efficiency.

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Metal Part Surfaces
Pneumatic Shot Peened

Shot peening is a F.A.A. accepted process accomplished by the pneumatic impingement of metallic, glass or plastic shot on critical engine parts. As a result of this process the parts fatigue strength and resistance to stress corrosion cracking is improved by enhancing parts residual surface compressive stress.

Nearly all fatigue and stress corrosion failures originate at the surface of a part, but cracks will not initiate or propagate in a compressively stressed zone. Compressive stresses are beneficial in increasing resistance to fatigue failures, corrosion fatigue, stress corrosion cracking, hydrogen assisted cracking, fretting, galling and erosion caused by cavitation. As a result of this unique process, critical stressed surface areas prone to stress corrosion cracking are shot peened to provide for longer lasting more durable parts life.

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Iron Manganese Phosphate Corrosion Coated

Internal engine parts are very sensitive to the effects of corrosion which can cause premature failure of the engines camshaft, hydraulic lifters and gears. Iron manganese phosphate coating is a F.A.A. accepted process of acid etching a lubricant into steel parts to reduce friction, provide for corrosion protection while improving fuel efficiency. When new parts are installed in an engine there are initial contact surface break-in effects.

Phosphate coating will assure a smooth initial contact break-in effect and also improve parts pitting fatigue life. Friction is reduced by the smoothing of the asperities of the mating gear surfaces and aids in keeping the gear tooth surface shape. This chemical conversion treatment forms a crystalline coated surface which provides for a significant improvement in contact fatigue strength and can greatly improve engine parts life

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Precision Three Axis
Crankcase Machined

Crankcases are straightened, then precision milled and final machine bored utilizing precision boring equipment to assure proper alignment and size.

The journals are also finish tested for size and journal geometry by airflow differential procedures to assure a precision fit of the bearings to crankcase halves. This procedure minimizes piston side loading, reduces bearing wear and provides equal loading on crankshaft main journals.

This line boring process reestablishes the centerline of the crankshaft axis, thereby insuring the centerline is parallel and equidistant to the cylinder deck planes for enhanced engine performance.

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Matched Camshaft
and Hydraulic Lifters

A hydraulic valve lifter is a device that converts the rotary motion of the lobes of the camshaft to linear motion to actuate the engines valves while taking up the slack in the valve train.

Valve train clearances change with temperature as the engine heats up and cools down, so the hydraulic lifters have to constantly compensate for thermal expansion of the crankcase, cylinders, pushrods, valves and other valve train components.

By the precision matching of hydraulic lifters with identical bleed down rates to a properly profiled and matched camshaft assembly, Victor's technicians can assure uniformity of independent valve overlap timing and maximum throttle response. This allows for smoother engine operation, improved fuel efficiency and increased engine performance.

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