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YAMAHA OX11A BASIC SPECIFICATIONS
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Engine name       - Yamaha OX11A 
Cylinder format   - 72 degree V format 10 cylinder 
Displacement      - 2996 cc 
Max. power output - Over 650 bhp 
Valve mechanism   - DOHC, cam driven direct lifter type 
Fuel injection    - Zytek 
Ignition          - Zytek 
Dry Weight        - less than 105 kg 
Dimensions        - Overall length 575 mm 
                    Overall Width 499 mm 
                    Overall Height 373 mm 
Spark plugs       - NGK


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THE NEW FORMULA ONE 3 LITRE YAMAHA OX11A
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Yamaha Motor Co., Ltd. has completed the development of a new engine - the Yamaha OX11A - for use in the 1996
season of the FIA Formula One World Championship. 

Making the fullest possible use of all the data and know-how accumulated by Yamaha in our seven years of F1 participation
since the '89 season, and the technology and experience we have gained in actual competition with our V8, V12, and V10
F1 engines during that period, the OX11A has been developed from scratch as a V10 engine designed specifically for the
3-litre class and completely different in concept from the OX10C used in the '95 season. 

During the development process the team devoted special efforts to (i) achieving a lightweight compact package, (ii) boosting
maximum power output by increasing top rpm range and (iii) achieving high level integration of the conflicting demands on an
F1 race engine to generate high power performance from a lightweight package, while reconsidering carefully and completely
such basic specifications as the bore/stroke and the materials used in all parts of the engine. At the same time special
consideration was given to facilitating pit maintenance with attention to the assembly and environmental concerns. 

In terms of actual performance factors, we achieved (i) improved intake efficiency, (ii) increased power output by means of
higher rpm range, (iii) better engine response for improved drivability and (iv) a reduction in friction-related loss. In addition
to designing completely new specifications for bore/stroke values, compression ratio, drive train, cylinder pitch, liners and
crank assembly, the materials used in all parts were reviewed from the standpoints of function, durability and reliability while
taking optimum advantage of the distinctive qualities of each material to achieve the best possible overall matching of qualities.

The total result is an OX11A engine with a high potential rpm range of over 16,000 rpm delivering a max. power output of
over 650 bhp. Furthermore, in terms of size, the new OX engine is an extremely lightweight, compact package that is 50.5
mm shorter in overall length, 44.0 mm shorter in height, 56.0 mm narrower in overall width, and 20 kg lighter in weight than
the OX10C. All this translates into big advantages when it comes to designing a high-performance chassis for this engine,
providing greater design freedom with regard to machine balance and weight distribution and aerodynamic qualities. 

In this way we succeeded in realizing our initial design goal of building a compact engine that serves an ideal element in the
total F1 racing machine package. 

Another important specification change is the adoption of a barrel type throttle valve that improves response and fuel
economy while its outstanding compatibility with the fly-by-wire and the rest of the throttle system also give a big boost to the
engine's drivability. 

Thanks to the achievements of our three year relationship with the Tyrrell Team, we have been able to solve a lot of the
problems concerning engine 'mountability', and design an engine that is easier to maintain. As a result, we can expect to see a
machine on which the set-up work and pit maintenance can be done more quickly and accurately. 

The development of the new OX11A has been conducted in cooperation with England's Engine Developments Ltd. 

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Source: Tyrrell Racing Organization
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