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1997 Mazda RX-7 - 4-Rotor for Street & Track

This is what legends are made of--sound the alarm

Aug 20, 2015
Photographer: Ryo Kaneta

How far would you go to build a dream car? Would you stay in when friends had the club going up on a Tuesday, walk past the liquor aisle on a Saturday, and avoid frivolous spending like a cut-rate DJ does live mixing? Few have the will power; I sure don't. Yuki Kamakura, on the other hand, does and in turn realized his dream by building this unique four-rotor 26B-powered Mazda RX-7. More impressive still is the fact that Yokohama local Kamakura-san is only 20 years old. He had a humble upbringing and had a hand in much of the wrenching that occurred at Scoot Sports Japan.

1997 mazda rx 7 oem front bumper Photo 2/46   |   1997 Mazda RX-7 - 4-Rotor for Street & Track

We stumbled upon this clean creation during our Fresh Tokyo Car Meet the night before Tokyo Auto Salon. Before our "love at first sight," there was an eargasm—BRaaaaapppp!! The raspy exhaust note heard bouncing off the concrete walls of the parking garage was a thing of beauty (just check out the video on our website to see). As a crowd gathered around the FD3S, anxious to see under the hood, the scent of strong gasoline fumes crept into our nostrils. Running rich with no f*cks given to mpg, it was clear the mechanic coverall-clad Kamakura-san still had four-rotor engine tuning to do post-Tokyo Auto Salon. But since we hosted a meet, the time had arrived to showcase it, and we were rightfully impressed!

1997 mazda rx 7 gusseted rollcage Photo 3/46   |   A look at the six-point rollcage—gusseted for your pleasure.

In '91, the Mazdaspeed 787B race car won the 24 Hours of Le Mans—it was the first Japanese champion machine. This vehicle and feat stuck with Kamakura and is the reason why he decided to build a 26B and drop it into his engine bay. Making this build a reality as a boiler operator by day was not easy, as told by Kamakura, "Basically, I spent 90 percent of my salary for an FD3S. I couldn't go out for play. I couldn't buy clothes. I went to the shop [Scoot Sports Japan] every day after work and helped their work—it was very good experience for me to know how to build this race car."

1997 mazda rx 7 quad rotor 26b Photo 4/46   |   In the rotary world, we’re used to seeing Mazda engines with two rotors; however, underneath the hood of Yuki Kamakura’s FD is a custom-built quad-rotor 26B. In simplest terms, more rotors equate to more air, hence more combustion. The motor is really compact and has a small displacement with a big power ratio—effective combustion with minimal pumping loss. The internals can turn to high rpm with less stress, a reason why Yuki can rev his motor up to 10,000 rpm!

While the '91 787B Le Mans winner is a radical design, this FD is more understated. "I wanted to keep OEM style, so I didn't use so much body kit and too much dress-up parts. Simple is the best way for making street and racing car. Function is beauty," Kamakura said.

1997 mazda rx 7 katsuta engineering front fender Photo 5/46   |   1997 Mazda Rx 7 Katsuta Engineering Front Fender

Still young, both the owner and the build, there is more fine-tuning ahead. Kamakura-san has his sights set on making a reliable 600 hp to the rear wheels, while also improving his driving ability to take on Fuji Speedway. He's built a legendary car that would gain the respect of anyone on the street or the track, but now it's time to set the record straight and show people why the four-rotor is one of the best engines in the world.

Hear the 4-Rotor at 1:16min mark.

1997 mazda rx 7 toda racing individual throttle bodies Photo 12/46   |   The four-rotor’s sound is heavenly. It produces a deep note at idle and screams like a sportbike at wide-open throttle!
1997 mazda rx 7 oem rear bumper Photo 19/46   |   1997 Mazda Rx 7 Oem Rear Bumper
1997 mazda rx 7 race seat Photo 26/46   |   1997 Mazda RX-7 - 4-Rotor for Street & Track
1997 mazda rx 7 custom dry sump oil system Photo 33/46   |   Custom dry-sump system allows a larger capacity of oil, plus allows the oil to cool faster.
1997 mazda rx 7 yuki kamakura Photo 40/46   |   Owner Yuki Kamakura doing homework in between shoot locations.
Sean Russell
143 Articles
1997 Mazda RX-7 - 4-Rotor for Street & Track
Tuning Menu
Owner: Yuki Kamakura
Hometown: Yokohama, Japan
Occupation: Boiler Operator
Engine: quad-rotor 26B with peripheral porting and RX-8 rotors; Scoot Sports custom exhaust and intake manifold; dry-sump system; TODA Racing individual throttle bodies; Bosch fuel pumps; SARD injectors
Drivetrain: ATS carbon twin-plate clutch; Cusco two-way limited-slip differential
Engine Management: Vi-PEC V.88 controller
Footwork & Chassis: Crux suspension
Brakes: Mazda OEM RS-spec brakes with 17" rotors and four-piston front, single-piston rear calipers; Project Mu brake pads
Wheels & Tires: 18x8.5" front, 18x9.5" rear Work Meister M1R; 245/40R18 front, 255/40R18 rear Yokohama Advan A050 tires
Exterior: Katsuta Engineering side skirts, mirrors and front fenders
Interior: alcantara and leather upholster; race seats; MOMO steering wheel; Defi gauges; six-point rollcage
www: scoot.ico.bz

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