Verner Boxer Engine
VM133MK 
Light aircraft engine for Microlight and light (experimental) sport aircraft. The Verner VM 133MK engine is a new model developed by Verner Motor Company in the Czech Republic, on the basis of the experience gained from the production of the first model, Verner 1400.
The Verner VM 133MK engine is supplied with carburettors, air filters, oil hoses and clamp, voltage regulator/rectifier and low battery charge warning light, low oil pressure sensor and warning light, and basic tools for ordinary maintenance.
To operate the Verner VM 133MK engine the following minimum instruments and components are needed. These are not normally supplied with the engine, only on request: oil cooler, exhaust pipes with silencer, engine rubber shock mounts, electric tachometer, dual CHT gauge with sensors, and oil temperature gauge with sensor. Main features of this Verner VM 133MK engine are:
- Four stroke piston engine
- 2 cylinder horizontal opposed Boxer
- Chain driven OHC operated four valves per cylinder
- Air cooled
- Fed by 2x Bing 64 constant velocity altitude compensating
- Wet lubrication system is sump type with oil pump and oil filter auto-motive type. An oil cooler is normally installed
- Engine case cast in magnesium alloy
- Reduction gear box with teethed steel gears oiled from the motor oil
- A torsional vibration absorber (clutch type) is mounted in the reduction gear box
- The propeller's shaft is bored out alongside (for e.g.: to permit the use of an in flight variable pitch prop.)
- Electronic ignition system CDI breakerless double type (with 2 spark plugs per cylinder
- Variable ignition timing driven from an ECU, fed from a magneto-alternator with battery charging system 12 V/160 W
- Electric starter
- Mechanical driven fuel pump
- Crank-shaft and con-rods mounted on sliding bearings (automotive type, VW, Mercedes)
- Light dry weight only 61 kg (without exhaust pipe and oil cooler)
- TBO 1000 hours
Each Verner VM 133MK engine is tested and tuned at the factory during 2 hours total running time, therefore no "breaking in" period is required. The manufacturer reserves the right to make changes and improvements to the design of the engine at any time and without prior notice. Check for the continued validity of the information available from this brochure before placing your order for an engine.
VM133MK ENGINE SPECIFICATIONS
| Displacement | 1345 cc /86.15 cubic inch |
| Bore | 97 mm /3.81 inch |
| Stroke | 90 mm /3.54 in |
Compression ratio | 1 : 9.5 |
| Maximum power | 84 HP (63 kW) @ 5500 RPM (5 minutes max.) |
Max. continuous power | 72 HP (52 kW) @ 4500 RPM |
| Torque | 119 Nm (88 ft/lb) @ 4200 RPM |
Fuel spec. Consumption | 2.2 imp. gal./hour @ 75% power (3750 rpm) |
Propeller rotation | CCW, viewed from the front, tractor propeller (tractor propeller) like Rotax 912 |
Weight dry weight | 61 kg, oil cooler: 1 kg, exhaust pipe: ~4 kg |
| Ignition timing | 5° BTDC up to 2500 rpm, after, electronically variable |
| Spark plugs | NGK DCPR9E R Thread M 12x1.25 |
| Spark plug gap | 0.5 mm (0.02 in) |
| Electric starter | 12 V/1000 W |
Generator (Alternator) | 12 V/160 W (13 Amp) |
| Lubrication | semi-synthetic motorcycle oil SAE 15W-50, API SH-CF, JASO MA (2.5-3 liters) |
| Fuel | aviation petrol 100 LL AvGas or motor petrol, octane number 92 or more |
| Fuel pump | Pierburg 7.20971.63 |
| Carburetors | 2x Bing 64 constant velocity altitude compensating |
| Reduction drive | 1 : 2.29 gear box, lubrificated with motor oil |
| Propeller hub | 75 mm B.C. × 6 × M8 mm tapped holes and Rotax standard on request |
Recommended TBO | 1000 hours |
PERFORMANCE CHARACTERISTICS
MAIN DIMENSIONS - SCHEMATIC ILLUSTRATION
