THE NEW YAMAHA 3-LITRE FORMULA ONE ENGINE: YAMAHA OX10C


Yamaha Motor Co., Ltd. has recently completed the
development of a new Formula One engine for use in the
'95 season - the Yamaha OX10C.

The engine has been developed in accordance with the new 
1995 FISA Formula One regulations. The engine has a V10type
cylinder configuration with a displacement of 3,000 cc that
will be mounted in the new Tyrrell 023 chassis. 

Due to the short time period between last year's new 
regulation announcement and the start of this year's 
season, Yamaha have made use of their existing technology
in the field of high-performance engine development and
production with a priority on creating an engine with
outstanding reliability. 

In order to keep the loss in power output, due to the
reduced displacement, to an absolute minimum, Yamaha have
taken last year's engine, the Yamaha OX10B, as a base and
further reduced the weight of moving parts like the
pistons, connecting rods and crank assembly, to achieve
higher rpm and thus maximise the power output.

Redesigning components like the oil pump and water pump has
also contributed to a decrease in power loss. This year,
competitiveness on the race track will depend more on the
overall quality of the engine and chassis as a unified
package than in previous years.

In comparison to many of the newly formed teams who will
compete in this year's championship, Tyrrell Yamaha has an
advantage as they have now been working together for three
years. This has meant a smooth transition in such areas as
accommodating the new engine and control systems to the
requirements of the newly developed chassis, and the whole
team is working together to ensure the optimal match of
engine and chassis qualities that will guarantee a fast,
competitive machine. 

Yamaha have taken such measures as further reducing
friction in the OX10C engine parts, and modifying the
location of the injector, all with the aim of designing an
engine that runs efficiently on less fuel. 

As for measures aimed at achieving a higher level of engine
reliability, Yamaha have set more meticulous and specified
standards in the various aspects of the reliability control
system. 

Tests began on the new 3-litre engine incorporating all of
the latest technologies in December and it has produced
excellent results. Track testing of the OX10C engine
mounted in the new Tyrrell 023 chassis is planned to begin
at Silverstone in mid-February. 

The development of the new Yamaha OX10C 3-litre engine has
been carried out as a joint project of Yamaha Motor Co. and
Britain's Engine Developments Limited. 


MAIN SPECIFICATIONS:       YAMAHA OX10C 
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Cylinder configuration:    72 Degree V10 
Displacement:              2,996 cc 
Power Output:              Over 650 bhp 

Valve Mechanism:           DOHC Direct lifter type
                           gear-driven cams 

Fuel Supply System:        Zytek 
Ignition System:           Zytek 
Dry Weight:                Less than 125 kg 

Dimensions:                Length 625 mm 
                           Width 555 mm 
                           Height 417 mm 


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Source: http://www.jtnet.ad.jp/WWW/MILDSEVEN/F1/