• Valach by Fiala VM 85 B2-4T
  • Valach by Fiala VM 85 B2-4T
  • Valach by Fiala VM 85 B2-4T
  • Valach by Fiala VM 85 B2-4T
  • Valach by Fiala VM 85 B2-4T
  • Valach by Fiala VM 85 B2-4T
  • Valach by Fiala VM 85 B2-4T

Valach by Fiala VM 85 B2-4T


Fiala, the manufacturers of the Valach engines, are a company that caters to the military; hence this is military grade equipment under constant development, it is and always will the most advanced engine manufacturer on the market.

At the moment we carry over 20 different models of Fiala engines.

Please contact for customized and lower shipping rates for shipping outside the US.

Valach by Fiala 85cc opposed twin cylinder gas 4stroke engine with electronic ignition


    Sensational smooth running and high torque
    Spontaneous throttle response and smooth mid-range transition
    Extremely low vibration throughout the RPM range because of the four stroke                  principle
    Nickel-Silicon plated cylinder surfaces
    Honda Valves
    Walbro Carburetor
    Valach microprocessor-controlled ignition with auto advance and retard
    An ignition integrated voltage converter allows the use of two LiPo cells
    VM-Motors are designed using the latest tools and techniques


    Displacement: 85 cc
    Bore: 42 mm
    Stroke: 32 mm
    Width including valve covers:  280 mm
    Length from engine mount to prop hub:  150,5 mm
    Engine weight: 2940 g
    including ignition:  3120 g
    Ignition voltage range:  4,8 - 9 V

Click for Dimensions


Fiala is the only 4-stroke company in the world which produces both the engines and the propellers developed and designed to be used with them. They go hand in hand.

The Fiala propellers have quickly become a staple in the global UAV industry as no other propeller matches their efficiency.

Hence it is important to run the Fiala propellers with the Fiala engines should you want to run the diameters and pitches shown in the Fiala manual. These specifications are based only, and I cannot stress that enough, on their purpose designed and built Fiala propellers.

Other brands run the risk of over torquing and stressing the engine unnecessarily, limiting performance and service life.


Recommended props:

26 x 14 Fiala 2blade

27 x 12 Fiala 2blade

28 x 10 Fiala 2blade