When Yamaha Almost Went Crazy

the eight valve Honda made Yamaha worried about losing its dominance but also Brad interest in further multivalve development in the 1980s it was indeed Yamaha who introduced a five valve comeback after Decades of Oblivion and it went as far as testing and nearly producing seven valve cylinder heads recognizing The Limited potential of Two Strokes in the future Yamaha initiated extensive testing of f stroke head Design Technology the Japanese anavil the XS 650 in 1970 introducing an advanced fourstroke twin but it was in 1977 at the Tokyo Motor Show when they showcased a truly groundbreaking prototype that surpassed its time the yzr 1000 featured a,c V4 engine equipped with double overed cams 16 vales Fu injection and liquid cooling with between radiators and an oil cooler boasting an impressive output of 135 horsepower and a top speed of 275 km per hour it ganed widespread claim while the V4 concept wasn't entirely new yamaha's utilization of this engine influenced and revolutionized the motorcycle world in the future years establishing the V4 as the Quant assential engine for super bikes and notably Moto GP intended to lay the foundation for yam's forthcoming for strog engines the Genesis engine was envisioned as an Innovative high performance multiv valve unit although the concept never transitioned to production it wasn't until 1979 when Honda introduced the oval piston engine in an attempt to surpass yam's winning two siser 500 that yamha Revisited their prototype they recognized the potential superiority of Honda's unconventional engineering and the looming risk of two stroke bands prompting them to seek an alternative Ace up their sleeve just in case in the person ude of Maximum volumetric efficiency yamha undertook extensive testing of various multiv valve configurations this exploration extended beyond the conventional four valve setup leading the Japanese Engineers to develop a single cylinder test engine for researching and evaluating the merits and drawbacks of alternative Solutions unlike Honda's approach Yamaha opted for a conventional circular ball cylinder this Dev velopment phase included experimentation with a five valve head featuring three intake and two exhaust valves two different six valve heads with four intake valves utilizing either a single or twin Spar PL and the most my boggling design a seven valve unit with four intake and three exhaust valves the research analyzed every aspect of each configuration focusing on complexity friction valve size possibilities and cylinder filling with multiple valves Twins power plugs became essential to ensure even ignition of the air fuel mixture throughout the cylinder however the findings reveal that Beyond five valves the benefits in terms of airflow were marginal the complexity of the valve train and the resultant friction outweighed any potential advantages in the 1980s Young yaha Trum card was intended to be a scaled down iteration of the yzr 1000 code named o1a the new 500 C fourstroke 90° V4 engine was equipped with the Revolutionary 7 valve head boosting a total of 28 bues with its ingenious Design This engine was rated at 125 horsepower capable of ring over 20,000 RPM however despite its potential the engine was never brought to fru as the advancement of two strog engine technology rendered both the oval piston Honda and yamaha's for stroke 500 CC razor obsolete subsequentially yamama saw entry into AMA dayun 200 which necessitated the participation of commercial based races featuring 750cc forr concurrently formula TT altered his regulation in 1984 permitting the inclusion of 750 cc4 Strokes alongside 500 cc2 Strokes Yamaha aimed to produce a limited run of 200 units of a small production motorcycle equipped with the S valve engine priced at 2 million yen each however nether endeav happened and the project faded into history remaining a fascinating footnote in yam's engineering Legacy the extensive multiv valve engine development undertaken by Yamaha yielded significant results despite the absence of production six and seven valve engines instead it was the simpler five valve engine that successfully transitioned from the research and development stage heralding the beginning of the eform Manion yamama Genesis engine series an advanced high performance multivalve Force rug engine [Music] [Music] linage introduced in 1984 the Genesis engine series debuted in the yamama FZ 750 with its water calleded 750cc 20 valve in line 4 reown for its Advanced design the FZ 750s engine was tilted 45° forward to achieve a lower Central gravity and introduced nearly perfect integ Runners down from carburetors the fz750 earned accolades for it exceptional speed impressive power delivery and flat torque curve while yamaha's foray into five file technology came decades after the first appearance of a five p in the 1920s Yamaha emerge is one of the boning companies in this [Music] realm the Genesis engine was further yet Iz in twins configurations powering models such as the TDM and TRX as well as yamaha's iconic R1 from 1998 until 2006 this commitment to multivalve development likely contributed to yamaha's venture into Formula 1 in the late 1980s and established a reputation producing some of the finest engines in the industry this prowess extends not only to yamaha's proprietary engines but also those they have tune including the JZ 4 AG two ZZ 2ur one LR V10 the Taurus Show V6 as well as the Volvo V8 dve from the outboard motor a

Channel: VisioRacer

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Length: 8min 34sec (514 seconds)

Published: Sat May 04 2024