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Like on the VM 120 B2-4T, the valve train of the new VM 170 B2-4T Mk.2 is fully encapsulated, improving rocker arm lubrication and the valve train runs quieter. The crankcase of the VM 170 B2-4T Mk.2 is manufactured from solid aluminum and guarantees highest strength with a low weight.
The Valach engines VM 170B2-4T Mk.2 looks just like an original aero engine, only smaller, it runs smoothly like an original aero engine and above all it sounds like an original aero engine.
Due to being a four stroke, the low vibration is nothing but sensational, and torque is really high. The response to the throttle being opened is so smooth without the slightest attempt to surge, making the Valach VM 170B2-4T Mk.2 absolutely ideal for your big aerobatic model.
Being a four stroke with a large capacity produces a very realistic full-size aircraft sound. With a relatively small silencer the sound level is very low rather like a small saloon car.
The Valach VM 170B2-4T Mk.2 is a four stroke OHV engine running on petrol/oil mixture.
Valves and their seats are manufactured by Honda, ensuring a very high quality. The totally enclosed valve train reduces sound, as well as ensuring the rocker arms are well lubricated. Due to the steel cylinder liners this engine will have a long life.
Rear view of the new VM 170 B2-4T Mk.2. Both intake tubes are exactly the same length.
The recommended static RPM range for the VM 170B2-4T Mk.2 on the ground is 4,500–5,000.
On the VM 170B2-4T installed in the Pitts Special S1-S, we use the Fiala 34x12" prop as this has proven to be ideal. Immediately after landing, that means with a hot engine, 28.5 kp static thrust was measured. When winds are strong I change over to a 34x14" Fiala. As would be expected the ground speed is increased, unfortunately the "Pitts sound" is partly lost thereby.
The Fiala propellers are very efficient, this being due to minimal blade thickness. They sound especially good on four stroke engines.
The processor controlled ignition allows easy starting and a exceptionally smooth running in all throttle settings.
We had tried many oils, but recommend Valvoline SynPower 2T oil. Our BEL-RAY H1R, although excellent for two strokes, is not ideal for four strokes, as it burns very well without deposit and not much gets past the piston, as is the case by the Valvoline SynPower 2T. We recommend Aral Ultimate 102, as the smell is not so penetrating and it can be stored without deteriorating. It does not contain ethanol.
The fuel consumption is approximately 50% compared to that of a two-stroke engine with the same displacement. A 750cc fuel tank lasts for about 15-20 minutes of flying time.
The legendary perfectionist Henry Royce of Rolls Royce always insisted that an engineering construction to be right must look right. I defy anyone to tell me the Valach Twin does not look right.
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