R26J - 787B Motor
Rotary Engine Illustrated - The Wankel Motor
 
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18.10.2007
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R26J - 787B Motor PDF Print E-mail
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Written by Wesley Mahler   
09.11.2006
This engine is the most famous engine Mazda has ever produced, and it was built solely for different GT Cars, specifically the 767 and the 787B. During the 24 Hours Le Mans races in 1991 this engine inside of the 787B won the race.

The R26J Series

The 1991 Le Man's Winning 787B Motor

Mazda Four Rotor Engines

This engine is the most famous engine Mazda has ever produced, and it was built solely for different GT Cars, specifically the 767 and the 787B. During the 24 Hours Le Mans races in 1991 this engine inside of the 787B won the race.

This was the first time a Japanese manufacture to won the race, and the first non-piston engine to win. It was a remarkable achievement and shook the world, now people understand the reliable power of the rotary engine.

R26J 4 Rotor Engine R26J 4 Rotor Engine
R26J 4 Rotor Engine
R26J 4 Rotor Engine R26J 4 Rotor Engine
R26J 4 Rotor Engine
This motor replaced the previous 13J series; it was derived from the 13J-MM model with few interchangeable parts. The Le Man’s specification of the engine stated it produced 700 bhp @ 9000 rpm, 607 (Nm) & 448 ft/lbs @ 6500 rpm. The engine displacement was 654 cc x 4 rotors equaling 2612 cc. The engine was a naturally aspirated and it had peripheral ports, which are the largest ports you can use on a rotary engine. The engine has a long eccentric shaft with two lobes for the original rotors, and the slide on “auxiliary” lobes for both sides.

Some of major modifications from the 13J were the following:

  • Variable length intake trumpets were multi-step in the 1990 R26B, and they were continuously variable in the 1991 version. This produced a maximum torque at any RPM range.
  • It had three spark plugs per rotors; they added the additional one above the two. This was called a “late trailing” plug.
  • The rotor housings and side housings (plates) were hot-ceramic coated.

The 787B had an amazingly fast acceleration because it only weighed 800kg, giving it a power to weight ratio of 1.2kg/vhp or (2.6lb/bhp). To put this in perspective a Ferrari F40’s power to weight ratio is 2.6kg/bhp (5.7lb/bhp), and Porsche 911 turbo is 4.5kg/bhp (9.9lb/bhp) This incredible weight ratio allowed the car to perform the 0-100mm (328 ft) sprint in ~2.5 seconds, and a ¼ mile time of ~ 9 secs @ 250km/h (155mph).

References: Craig's Rotary Page

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Last Updated ( 09.11.2006 )
 
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