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The Valach Motors VM R5-420 just looks like a real radial engine, only smaller, above all it sounds like a real aero radial engine. Not improperly smooth, like smaller radials. If you have experienced our Aichi Val on an air show you will know what I mean. The absolute scale flight with the marvellous sound from that large capacity radial engine can, if at all possible, only be bettered with a full-size machine.
The big capacity per cylinder, the valve timing and the supplied ring shaped silencer are responsible for the realistic sound on idle and on part load. Like all Valach engines, the response to the throttle being opened is so smooth without the slightest attempt to surge.
Valves and their seats are manufactured by Honda, ensuring a very high quality. Due to the inclined valves, the combustion chamber is shaped more like a hemisphere. This improves the combustion and the engine has a higher performance. In addition the fuel consumption is lower than otherwise. My Aichi has just a 1.5 Liter fuel tank!
The crankcase, cylinders and cylinder heads are cast like with full-size aero engines, which enables a light weight and the VM R5-420 with the casting surface finish has a very realistic appearance. Due to the steel cylinder liners this engine will have a long life.
Due to the rather pungent smell of normal grades of petrol and the alcohol content, we recommend to use either Aral Ultimate 102 or Shell V-Power in conjunction with the synthetic two stroke oil Valvoline SynPower 2T.
Price for this engine does not include silencer/exhaust. Please select the matched one from our website if you need exhaust. For Manual and dimension info, please click "Manual" button
| Cylinder: | 5 |
| Displacement: | 420 cc |
| Output: | ca. 25 hp |
| Bore: | 47 mm |
| Stroke: | 48.5 mm |
| Diameter: | 425 mm |
| Length from engine mount to prop hub: | 255 mm |
| Weight: | 11.8 kg |
| Ignition voltage range: | 6 - 9 V |
| Idle RPM: | 800 |
| Max RPM: | 4500 |
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Propeller size: |
42x20" |
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Fiala Prop 3-Blade: |
40x18" |
Fuel: |
1:25 - 1:33 |
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Valvoline SynPower 2T / Aral Ultimate 102 or Shell V-Power 100
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