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Mazda 787B

Category	Group C/IMSA GTP
Constructor	Advanced Composite Technology
Designer(s)	Nigel Stroud
Technical Specifications
Chassis	carbon composite monocoque
Suspension (front)	Double wishbone pullrod operated inboard Bilstein spring dampers.
Suspension (rear)	top rocker-operated inboard spring dampers.
Track-width	(F/R): 1534/1504 mm (1530/1450 mm)
Wheelbase	2662 mm (2640 mm)
Track-width	(F/R): 1534/1504 mm (1530/1450 mm)
Engine	Mazda R26B 654cc x 4 cc Wankel rotary naturally aspirated Mid-engined, longitudinally mounted
Transmission	Mazda/Porsche 5-speed manual
Weight	830 kg (1831 lb)
Fuel	Idemitsu
Tyres	Dunlop 300-640x18/355-710x18 (275-620x17/330-700x17)
Competition History
Notable entrants	Mazdaspeed/Oreca/Alan Docking Racing
Notable drivers
Debut	1990 24 Hours of Le Mans, Circuit de la Sarthe.
Races   Wins    Poles     FLs    1
n.b. Unless otherwise stated, all data refer to Formula One World Championship Grands Prix only.

Platform	(Body construction) Kevlar/carbonfibre composite
Engine(s)	5 plain main bearings, 3 NGK spark plugs per rotor
Length	4782 mm (4650 mm)
Width	1994 mm (1990 mm)
Height	1003 mm (1010 mm)

The Mazda 787/787B were prototype Group C racing cars built for the 24 Hours of Le Mans and World Sportscar Championship, replacing the 767B. It used a 4-rotor R26B Wankel engine which produced over 700 hp (522 kW). Debuting in the 1990 24 Hours of Le Mans, and later in the All Japan Sports Prototype Championship, the initial 787 was plagued with problems. At Le Mans neither 787 were able to finish due to electronics and oil failures, although an older 767B was able to finish. For 1991, Mazda upgraded the car to the 787B, and for the first time entered into the full 1991 World Sportscar Championship season. At Le Mans Mazda was able to score a historic victory for not only the first and only victory for a Japanese manufacturer, but also the first and only overall victory for a car powered by a Wankel rotary engine. This car would be the culmination of Mazda's efforts with the rotary engine since the 1970s.

Contents 1 1990 24 Hours of Le Mans 2 1991 Season 3 1991 24 Hours of Le Mans 4 Life after Le Mans 5 Specifications 5.1 Chassis/Body 5.2 Engine 6 References and notes 7 See also 8 External links

In 1990, as the Le Mans had its Mulsanne straight cut into threes, the FISA and ACO entered into a row over financial rights over the event, as a result Le Mans became a non-championship round. Mercedes-Benz who won the race in previous year as Sauber, pulled out of the race as a protest over the dealing over the two organisations, preferring to concentrate on the WSPC. Mazda, as under the rule amended in 1989 which stated that in order to compete in Le Mans, a team is required to enter all rounds, like many did the opposite by pulling out of the series and entered three cars especially for that year's race with a 787 which was like the earlier 767, it was the same car, except it had the 26B. Also, the car also had a carbon composite monocoque chassis with carbon fibre body, which was becoming commonplace for racecars and used the same Porsche designed 5-speed gearbox. Like all previous models after the 737, the 787 was built by Advanced Composite Technology based in Heanor, Derbyshire in Britain and was designed by Englishman Nigel Stroud. Incidentally, the cars resembled the Porsche 956 which he was commissioned to design a clone for Richard Lloyd Racing in 1984.^[1] The track width was reduced 50mm to improve aerodynamics and to accommodate the increased engine output, the disc brakes were increased to 360mm. The biggest change was the engine, specifically developed for this race, the R26B was lighter, smaller and more economical than its predecessor. The R26B Wankel engine benefited from a variable intake system, optimizing air intake for certain vehicle speeds. Two periscope-shaped air intakes were mounted ahead of the rear wing. Each intake assembly was mated to a telescoping-pulley system which was able to vary the height of the protruding periscopes through a stroke of approximately six inches. The extension and retraction of the intakes was governed by the car's ECU computer depending on vehicle speed. At high speed, the intakes were retracted to decrease drag and smooth airflow over the rear wing, and to reduce the restrictions on the air flow into the engine. At lower speeds, the intakes were extended in order to provide maximum positive pressure to the charge entering the rotors. Also, it benefited from an extra spark plug on each rotor from the 767’s two, making the car more economical and improving combustion. An oil cooler was mounted at the front and the car’s aerodynamics were improved at the sides and top of the bodywork. Like all previous Mazda Factory racing engines, it had Peripheral Porting (versus side intake porting used in production engine's) to produce good power at high rpm.

Engine speed (RPM's) was deliberately kept low for to improve reliability during the 24-hour endurance race. The 787 was reported to have a redline around 9000rpm. However, interviews with Mazda's 787 race engineers revealed that the power of the 4-rotor increased dramatically above 9000rpm. One engineer stated that the car could develop more than 930 horsepower at 10,500rpm. Engineers also commented that during the post-race inspection and engine tear-down they found little to no wear on any internal parts and could have run another 24-hour race.

Having no experience in the race, the car logged over 2900 miles during testing between April and May in Fuji, Silverstone and Estoril.^[2]

Unlike the previous year, they found they were no longer the sole team entrant, having to face against a sole MOMO backed privateer Porsche 962, to improve their chances, in May that year, Mazda hired legendary six time winner Jacky Ickx as consultant, and for the race entered a sole 767 of the previous year, numbered 203, driven by three of its leading factory veterans in Japan Takashi Yorino, Yoshimi Katayama and Yojiro Terada and fielded a pair of 787s for the non-Japanese drivers, number 201 for Volker Weidler, Bertrand Gachot and Johnny Herbert and number 202 for Stefan Johansson, David Kennedy and Pierre Dieudonné.

Car #201 was painted in white dominated by the logos of their sponsor 0123 a Japanese removal company which goes by the official name Art Moving Center and Art Sports, a sister company specialising in luxury car imports. Car #203 and #202 had an outrageous bright orange and green scheme, sporting the logos of Renown, an apparel manufacturer and Charge, a sister company of Renown, specialising in sportswear. The car #202 would start at grid 22nd with #201 behind it, outqualifying two works Nissans and a selection of privateer C1 cars and #203 at 34th, at the middle of that selection before the C2 cars. During the night of the race, the Porsche which hold the lead in its category for the last four hours until it retired with gearbox failure at 2am, leaving the class win open to Mazda, but into the morning at 3 and 5am subsequently, the 787s would fall victim to oil leak and scorched electrical loom, leaving the win to an old 767, finishing at 20th, the highest for a non-C1 car.^[2] Both mechanical failures were caused by lack of cooling causing the ceramic coating in the new R26B engine's side housing to peel off which scored the housing walls.^[3] Mazda would then return for the following year with an improved version called the 787B and would find themselves in numerous changes in not just the car, also with the management and the regulation.

Having being used to taking class wins since 1987, although no superior to the C1 category cars that dominates the top ten position, the IMSA GTP category that they had became accustomed to in previous years was merged into the newly renamed Category 2 against the C1 cars, meaning that the race will be run as a two category race. Also that year, the FIA prioritised the new 3.5 liter atmo formula that was introduced in 1989, known as Category 1, meaning that the category which the 787B was entered in, were forced to start behind the notoriously unreliable Cat.1 cars.

Now being in a second priority category, the category was still run to a fuel consumption formula, rather than the unlimited fuel allocation formula the series became accustomed to back in the US. Teams were allotted a specific amount of fuel, which was to be used for the entire race event - practice, qualifying and the race itself, unlike Cat.1 which had unlimited fuel allocation.

Undeterred, to show how serious Mazda was at winning the race, Takayoshi Ohashi’s Mazdaspeed group was given full factory backing.^[4]

With the extra financial freedom, Ickx replaced long time campaigner Alan Docking Racing with French outfit Oreca despite the 1991 season being only their second outing and their first since 1981 as a privateer. The decision was made based on Ickx’s experience with the team when he won the Pharaohs Rally in a works backed Lada Samara fielded by them and felt their adaptability made them a better choice than Allan Docking Racing. Ickx felt the car was running on too much weight for a Cat.2 car, so Ohashi would make a visit in Paris at the FIA’s headquarter to persuade them to allow the car to run with 50kg less than previously. This meant the car would weigh 170kg less than the standard 1000kg required by the competitors.^[4]

Mazda also continued to use the old 787 and 787B for the World Sportscar Championship and the JSPC, who was run by Mazdaspeed. Mazda would build three 787B, chassis 001 and 003 to be used in the Japanese championship and 002 would be extensively tested at Paul Ricard and not be used until the Le Mans race.

In order to win the 1991 race, Mazda engineers and the 787B had some new and significant obstacles to overcome. First, a year prior, two new chicanes had been installed on the Hunaudières Straight, breaking the nearly 3-mile long straightaway into three shorter segments, thus reducing top speeds from over 240mph (370 km/h) to roughly 210mph (338 km/h). This increased stress and wear on the brakes, having to stop the car from more than 200mph three times instead of just once as on the old layout, but reduced the chances of a tire blowout which was the purpose of the chicanes. It was the first time the car was equipped with carbon brakes.^[5]

The 59th 24 Hours of Le Mans which was round 4 of the Sportscar World Championship was the first time the race took place at the entirely new pit complex much to the pleasure of pit crews and drivers, after several years of having to use the notoriously cramped area, which became associated with the film of the same name. Mazdaspeed entered three cars and a spare, one of them was a 787 from the previous year, numbered #56, driven by Dieudonné, Yorino and Terada and two brand new 787B. One of them was driven by Maurizio Sandro Sala who replaced the newly retired Katayama, Johansson and Kennedy numbered #18 (001) and the #55 (002) car of Weidler, Herbert and Gachot making its only appearance in its only race. Unlike the other two cars which was painted in their standard blue stripes on white livery, #55 had an outrageous bright orange and green scheme and retained its sponsor who had been with them since 1988.

Mazda was not the favorite to win, but the three Mazdas started on 19th (#55), 23rd (#18) and 30th (#56), despite being the 12th, 17th and 24th fastest qualifier respectively. On the day before the race Ohashi decided to drop his usual conservative strategy and instructed the drivers of the #55 car to drive as if it were a short sprint race. The decision was made based on the reliability of the cars demonstrated in the Paul Ricard tests, as well as the car's exceptional fuel economy.

In the early stages of the race, the #55 car made it's way ton third place with the #18 car behind it 2 laps down. The #18 had a lower gear ratio setup meaning the car used less fuel but was 20km/h slower. The #55 would by night, move into second place when the Mercedes-Benz C11 of Michael Schumacher who was driving with, Fritz Kreutzpointner and Karl Wendlinger would spin off and later pit in with a gearbox problem. By the 22nd hour, the #55 car would finally take the lead after the C11 of Alain Ferte was force to pit in with mechanical problems. Toward the last hour, Herbert made an extra stint, and took his 787B across the finish line first, completing 362 laps and covering 4932.2km. The two other cars finished sixth (#18) and eighth (#56). Three Jaguar XJR-12s and a sole Mercedes filled out positions two through five. Herbert was so worn out that he had to be assisted out of the car and was unable to make it to the podium, leaving Weidler and Gatchot to take up the celebrations. He would later explain in a magazine interview that “dodgy” spaghetti he ate before his shift was the cause{fact}. The race was run without a hitch apart from a blown bulb at the headlights and a precautionary drivetrain change, which was the only delay for the car.^[4]

It was believed that the secret behind the win was Mazda's commitment to and refinement of the same basic engine/chassis concept, including the drivers -- whilst rivals Nissan and Toyota spent the era adopting and dropping new concepts, suppliers, engine configurations, drivers, and even teams.^[1]

After Le Mans, the winning car retired from duty while the other two cars continued to race. Mazda would go on to finish 4th and 5th in the Japanese and World championship respectively, with a season high (besides LeMans) 3rd in the 1000 km Fuji race (a JSPC race). As Mazda used different drivers throughout the season, none of their drivers finished in the top 10 in points.

At the end of the season, the FIA (Federation Internationale de l'Automobile) outlawed the use of Wankel-type rotary engines in racing series which it governed as a way to sway teams to the 3.5L F1 engines that had become their preferred platform. The 1991 24 Hours of Le Mans would be the last time the 787B would compete in international motor racing. Mazda would go on to compete with the Mazda MXR-01, which was based on the Jaguar XJR-14 and entered by Mazda the following year powered by a Judd unit. without much success. Also it would be the last win for a car with Dunlop tires.

Despite the enormous success of the 787B and its Wankel powerplant, Mazda didn't fully exploit its historic victory through marketing campaigns and advertising. However it did strengthen sales partially for Mazda's road cars. In the United Kingdom, Mazda would release a special edition of its MX-5 with the racing color and also a BBR (Brodie Brittain Racing) turbo conversion; the car is one of the most sought after special edition cars of its model. Long a proponent of the rotary engine, Mazda has maintained a rotary-engined road car for many years, though sales of the Mazda RX-7 were stopped in most U.S. states in 1996 (and in Japan in 2002) until release of the 2003 Mazda RX-8. The Mazda RX-8 utilized a new generation of the Mazda Wankel engine, dubbed "RENESIS" which uses side intake and exhaust ports.

Of the winning drivers Herbert would have a successful a career in Formula One, notching up three wins before leaving the championship in 2000 and returning to sportscar racing. Gachot would go on to drive at Jordan Grand Prix before being given an eighteen months prison sentence in August for a CS gas attack on a taxi driver in London, his place for the Belgian Grand Prix was famously filled by newcomer Schumacher. He was finally released after two months and had minor successes before retiring altogether. Weidler would compete in the Japanese Formula 3000 championship, only to have his career cut short when he was diagnosed with tinnitus, recommending he should take time off to allow for an operation but he chose to retire from the sport and handing over his seat to Heinz-Harald Frentzen. Of the non-winning drivers, Dieudonné would later hang up his helmet and become sporting director at Oreca, this time backed by Chrysler to help the Dodge Viper to score class wins at Le Mans by the late nineties and an overall win at the 24 Hours of Daytona in 2000. Terada, a veteran of the race since 1974, continued to run his Autoexe tuning business. He still competed at LeMans, although without factory backing but showing no signs of retiring. The former F1 driver, Johansson, would return to IndyCar duties frequently competing in the race before returning full time.

The R26B engine would be used by Mazda in its Mazda RX-792P for its premier IMSA GTP category with limited success. The engine continued to be used in the GTS category, for the spaceframe FD3S RX-7 which would return to Le Mans in 1994, backed by Mazdaspeed. The livery would return again in 1995, when a rotary powered Kuzdu, which was competing in IMSA’s WSC (World Sport Car), a category with different regulations than the FIA. This time they would start the race without the Renown sponsorship and in 1996 in the lower end LMP2 category which was the last time Mazda used the livery. Mazdaspeed would continue to compete in the race until 1999.^[6][7]

There are however many series that are not under the governance of the FIA, most notably Le Mans and the American Le Mans (ALMS) and Le Mans Endurance (LMES) series. B-K Motorsport competed a Courage C65 LMP2 prototype in ALMS in 2005, powered by a Mazda tri-rotary; and painted in a yellow and blue version of the livery worn by the 787B.

Today the car is considered by Mazda and Rotary enthusiasts as one of the most iconic cars to come from Japan despite its non-Japanese origin. The 787B have been celebrated by virtually every major toy and model company in and outside Japan. The 787B is considered as the most popular of the Group C cars and has appeared in several video games, with its first appearance in Sega's arcade game Le Mans 24 in 1998, and then in Gran Turismo 3. It can also be seen in both Enthusia Professional Racing and the Gran Turismo follow-up GT4 and it will make its upcoming appearance in Gran Turismo 5. Throughout the Gran Turismo series, the color scheme can be seen as a fictitious compilation of various Mazda paint schemes. in 2005, a factory backed RX-8 used the renowned color to compete in the 24 hour race.^[8]

Mazda keeps the winning car at the good condition and put it in the Mazda Museum in Hiroshima. At the same time, Mazda producted four replicas and gave one of them to the LeMans Museum. The car usually makes appearances at the annual Sevenstock shows, and has made two appearances at the Monterey Historic event in 1999 and 2004 and still bears a pair of small oval racing sticker behind the side windows, referring to its appearance at the 1999 Goodwood Festival of Speed, when it was reunited and driven by Gatchot. The car also made an appearance at the Mazda Festa in Japan and crashed, denting the wing and damaging the tail lights.

1990 787 specification are in brackets

• Body construction: Kevlar/carbonfibre composite
• Wheels: 18 in x 12 in front/18 in x 14.75 in rear Volk Racing Magnesium Alloy (17 in x 12 in front/17 in x 14.75 in rear)
• Brakes: Carbon Industries outboard ventilated 14inch carbon discs and callipers (Brembo steel)
• Lighting: 2 Cibie headlights on each side

• Spark plugs:
• Fuel system: Nippon Denso electronic fuel injection
• Battery: Pulsar
• Maximum Power: 700 hp/9000 rpm
• Maximum Torque: 448 ft.lb/6500 rpm

• Mazda
• 24 Hours of Le Mans
• Circuit de la Sarthe
• List of Mazda vehicles
• Group C
• Mazda RX-7
• Mazda RX-8
• Renesis Engine
• 1991 24 Hours of Le Mans
• Felix Wankel
• Wankel engine

• Overboost article
• Mulsanne Corner article on 26B
• Animation of 4 Rotor Engine - R26J

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