Aprillia 450

Farmer John

T.C.F.<br>(tire changin' fool)
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#2
:thumb:

Bill, have you ever seen Harry Hoffman's CR/NT 650 dual sport?
It's a 650 Hawk engine in a CR 500 chassis.....
 

bclapham

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#3
lets hope they can achieve what cannondale failed at. Joel Smets was going to race the apprillia in the world GP's but has now gone to ride the new rm450 thumper
 
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#6
or check out the aprilia web site http://www.aprilia.com/portale/eng/mag_articolo.phtml?id=289
 

Flying Scot

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#7
That's fantastic. A whole new area that the big guns will quickly exploit. Lets hope Aprilia find a decent chassis to put it in.
 

380EXCman

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#8
The motor looks further along in development than they are letting on. It looks to me to be a little on the heavy side (bulky maybe) then throw in the estart. I would like to see the motor next to a CRF or RFS motor..... But I do like the idea of Aprilla getting into the game. Maybe they can do a better job than the their countrymen have done with Husky.....
 

Jon K.

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#9
Cool! Aprilia has invented the twin-cylinder engine!! :worship:
 

BunduBasher

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#10
I wonder what dirt bikes they are looking at - dirt trackers maybe - supermotard - how heavy will that engine be, what will it do to the handling characteristics of the bike, will it turn etc.

I had in my minds eye a 500 twin a while back, thought it would be cool if it was light enough, should be interesting to see how this turns out.
 
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Senior KX Rider

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#12
Aprilia Off-Road Engine

from aprilia.com

15-09-2003 TIME 18:05

EICMA: THE 45.V2 ENGINE, SOMETHING ABSOLUTELY NEW!

A never seen choice, a great project. A totally new engine, thought and realized in order to open a new dimension in the off-road field. Aprilia explores the frontiers of technology with their 45.V2 engine for the world of off-road bikes, consisting of two ultracompact V-cylinders with high specific horsepower and record light weight. It was considered an impossible feat to exploit the benefits of a twin-cylinder engine in off-road races: only Aprilia could try something as brave and as innovative with such great confidence.

The passion for off-road bikes is not new to Aprilia. Its first love was in fact the off-road world and its first sporting successes were had in motocross and trial. Aprilia has always distinguished itself in these sectors through its contribution towards technological innovation. Innovation also marks Aprilia's great return to the off-road world... not a quiet return, but a return in grand style, with technology never before seen in this sector: revolutionary ideas with which Aprilia once again leads the way along the road to innovation.
The 45.V2 lays the foundations for a revolution in the sector. The project has been entirely developed in Aprilia's R&D department: engine specialists and frame experts worked side by side to transform a revolutionary idea into reality. Months of extremely hard work have led in record time to a working prototype which has already given positive preliminary test results. As is tradition in Aprilia, the project initially set out to win races, but the engine was also designed for all the enthusiasts in this continually growing sector, where Aprilia intends to leave its exclusive technological mark.

THE FIRST TWIN-CYLINDER OFF-ROAD ENGINE
Innovative and even daring choices. After analysing all the alternatives, a 77° V-twin engine was chosen. This choice was dictated by the need for maximum possible power and at the same time a wide range of use. The sophisticated engine management electronics, developed by the Aprilia racing department, introduces several innovations in the sector. Thanks to the limited unitary displacement, an extremely compact and equally light drive shaft was made possible, giving rise both to an engine which is highly responsive to the rider's control, and to a very fast easy-to-handle bike owing to the low gyroscopic effect. Even when decelerating or idling, the typical inertia of large bores and strokes is minimized. For an off-road bike, the size of the engine is as important as its performance. Aprilia's extremely advanced know how has got round all the typical size limitations of twin-cylinder engines and has pulled off a true miracle in compactness. The dimensions of this twin-cylinder engine are, in fact, smaller than the single cylinder engines currently on the market. An incredible work of refinement led to solutions such as a single overhead driveshaft as the best compromise between compactness, light weight and performance. Every single engine component has been optimized not only for maximum performance, but also for quiet running, in order to meet the sound-level limits currently being proposed for the sector; equal attention was also paid to limiting pollutant emissions. Weight was certainly not overlooked: the engine actually sets a record for its type and is moreover fitted with electric starting, the only one on the 45.V2. In order to achieve this result Aprilia did not skimp on the use of noble metals and ultralight materials. The central casing is made of aluminium-silicon, all the covers are made of magnesium, the valves are titanium, and the gearing has been made much lighter. Utmost attention was paid to fluid dynamic efficiency, thanks to powerful calculation programs which not only optimized the thermodynamic components, but also the intake and exhaust systems.

THE 45.V2 ENGINE IN A NUTSHELL

· Displacement: 450 cc.
· Type: 77° V-twin
· Timing system: single overhead shaft controlled by a silent chain; four titanium valves per cylinder
· Maximum revs: 14,000 rpm
· Starter: electric
· Gearbox: front clutch, with 4 / 5 gears
· Clutch: multiple disc wet clutch with hydraulic control (or mechanical on request).
· Powerful compact the “Terre Rare” alternator provides sufficient power for the injection system, electric starter, battery charger and auxiliary circuits
· Lubrication: separate dual circuit. The engine oil is separate from the drive oil. The pressurized oil circuit consists of a paper cartridge filter, an oil tank and a check valve
· Forced liquid cooling with centrifugal pump.
Aprilia is forward-looking, and the 45.V2 engine has an eye to the future, even as regards regulations. With a smaller unitary displacement, it is easier to meet the sound-level limits expected for the future, and with total electronic engine management, emissions are improved, which has also become an important factor for off-road and racing bikes.

“I'm happy and thrilled to start working on this ambitious, innovative, high-tech, off-road project of Aprilia's; it's exciting for the technical choices made.”

Ivano Beggio
 

dave186

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#14
that thing is freaking awesome looking, i want to hear what it sounds like revving out to 14000!
 

firecracker22

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#15
It's pretty. ;)

How hard would it be to change spark plugs? Will they be buried like some of the newer 4 strokes?

Maybe I missed it, but what is it going in?

It won't be AMA legal for racing--isn't there a clause against twins? I know there have been other twins, years back, and they weren't race legal.

At least they share a carburetor--no hassles with synching multiple carbs, which is bad enough on street bikes but unacceptable offroad.