ORAL-OR-4TK
Designed comprehensively to be a long lasting, high performance race engine; the Oral offers a centrifugal clutch driven, 34hp, dry sump liquid cooled engine with electric start. An internal sump and water pump also add to the ergonomics of the package. An absolute screamer on the top end, the ORAL has a large Formula 1 Pedigree, as technical director for ORAL, Mauro Forghieri has 12 F1 World Championships in his name for Ferrari (of which 8 are constructor and 4 are drivers). Also having run departments of Lamborghini and Bugatti, his racing and motorsports knowledge is priceless. That knowledge as well as that from other name marks in the European motorsports world is evident in this high performance racing engine that is turning some heads worldwide.
Specifications
| MONOCYLINDER 4 STROKE ENGINE: | |
| Bore: | 78 mm |
| Stroke: | 52 mm |
| Capacity: | 248.5 cm3 |
| Conrod length: | 100 mm |
| Clutch: | Centrifugal |
| Main power transmission device: | Chain |
| Timing device: | Two canshafts on cylinderhead |
| Inlet/exhaust valves: | 4 valves |
| INLET SYSTEM: | |
| Carburettor: | Dell'Orto 030 mm (optional: 026 038) |
| Air filter: | Airbox with possibility to remove filtering element |
| Acoustic level: | <100 dbA |
| COOLING SYSTEM: | |
| Water circuit cooling device | |
| Water pump fully integrated into engine body | |
| IGNITION SYSTEM AND STARTER: | |
| Electronic ignition device with variable spark advance | |
| Backup battery and generator | |
| Engine speed revs. limiter by software | |
| Electrical engine starter | |
| EXHAUST STYEM: | |
| Exhaust silencer as per rules | |
| Pollution as per EU rules | |
| ENGINE BEHAVIOUR: | |
| K1 version: | 38 mm carburettor, 29.1 kW (39 CV) @ 13.000 revs/1' |
| K2 version: | 30 mm carburettor, 26 kW (35 CV) @ 13.000 revs/1' |
| K3 Junior version: | 20 mm carburettor, 16.7 kW (22.5 CV) @ 13.000 revs/1' |