An engine.
Go use it.

Credits to Othawne for the Manifold work, he made one damn fine exhaust.

Yes, it's based off the R26B from the Mazda 787B

R31C/R.
• A specially modified version of the widely produced R15E and the R23E/TS for racing applications.

The differences between the three engines:
• The R31C/R has been given two additional rotors (in the case of the R23, one)
further increasing its horsepower, torque and the displacement to 3,152cc.
• Uses a peripheral intake port instead of the factory side intake ports.
• EFI replaced with two twin-barrel RT Hashigara 50mm Carburetors
• Multi-fuel: Petrol, AvGas, Ethanol.
• Naturally Aspirated.

It was NTA's first four-rotor engine, used in 1988 to 1994 for Le Mans, Group A, B, C and finally, Group S
where it was replaced in the middle of the season by the better, more reliable R31E/TCI.

Overview
Manufacturer - NTA
Production - 1985 - 1994

Layout
Configuration - 4-rotor, inline
Displacement - 788cc x 4 (3,154cc/3.1L)
Equivalent Displacement - 6,308cc/6.3L

Combustion
Fuel System - Carbureted
Fuel Type - Multi-fuel
Oil System - Wet sump
Cooling System - Water
Induction - Telescopic Intake Manifold System

Specifications
Compression Ratio - 10.5:1
Induction - Telescopic Intake Manifold
Horsepower - 1078bhp @ 13000rpm
Torque - 629 lb-ft @ 10,500rpm
Weight - 172kg

Chronology
Predecessor - R15E
R23E/TS

Successor - R31E/TCI
R47E/TCI

Applications
- 1988 NTA Savanna Group S (RS87/S)
- 1988 NTA Savanna RT-Hashigara Edition (RTH-RS87)
- 1990 NTA Infini LM-Spec (RI90/LM)
- 1991 NTA R52 Group C
- 1995 NTA Savanna 30th Anniversary Edition (RS93/AE)