| | | | EICMA: APRILIA MXV 450 |  Written: 15/11/2006 : 15:30. Read 5240 times (10/day). | | The integrality of this filed article is for Premium Members. | The 45.2 engine has already accumulated titles and victories in enduro and supermotard racing. Now the same engine has become the heart of the new MXV, the first motocross bike in the world to be powered by a twin cylinder engine.
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ENGINE
In this dedicated motocross version, the engine maintains the unique configuration that has distinguished it from the start. The V angle remains 77°, and the cylinders with wet liners remain integrated in the crankcase.
The engine’s light weight is the result of radical choices in materials. The valves are in titanium, the crankcase in aluminium silicon alloy, and all covers are in magnesium. Everything about the engine is designed for minimum weight in conjunction with maximum strength and reliability.
The 45.2 engine is extremely civilised and silent running even in this motocross version, and complies easily with FIM rules for noise emissions (94 dB threshold). Just as its homologated sister machines, the MXV affords easy access for maintenance (plugs, oil filter, air filter), and boasts extended maintenance intervals, far above the average.
The engine has a dry sump lubrication system but on the MXV the oil tank is actually integrated inside the crankcase to eliminate unnecessary oil pipes and reduce weight even further.
The starter motor has been eliminated for the same reason. Starting is by kick-start only in order to minimise weight.
The sophisticated electronic engine management system also introduces a number of motocross firsts. The Dell’Orto fuel injection system is managed by a programmable ECU with mapping optimised for motocross use.
The radiator no longer comes in two sections but is a single central unit, reducing weight even further by eliminating unnecessary connecting pipes and hoses. Radiator capacity has also been increased to improve engine efficiency.
The salient specifications of the 45.2 engine on the new MXV:
- Electronic fuel injection.
- Dry sump lubrication with the oil tank integrated inside the crankcase. Separate lubrication for gearbox and engine ensures that the engine oil is not contaminated by clutch plate particles, and remains fully efficient for far longer.
- Single overhead cam, titanium valves.
- Single-piece crankshaft.
- Cylinders integrated in crankcase, wet liners.
- Single radiator.
The integrality of this filed article is for Premium Members.
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