Isuzu V12 F1 engine

Isuzu made an experimental 75-degree, four-stroke, naturally-aspirated, V-12 racing engine, dubbed the P799WE, designed for Formula one racing; between 1989 and 1991. The experimental unit was used in the Lotus 102B and Lotus 102C.[1][2][3][4]

Isuzu P799WE
Overview
ManufacturerIsuzu
Production1989–1991
Layout
Configuration75° V12
Displacement3.5 L (214 cu in)
Cylinder bore85 mm (3 in)
Piston stroke51.3 mm (2 in)
Valvetrain48-valve, DOHC, four-valves per cylinder
Compression ratio13.0:1
Combustion
Fuel systemPort fuel injection
Fuel typeGasoline
Oil systemDry sump
Output
Power output640–765 hp (477–570 kW)
Torque output296–308 lb⋅ft (401–418 N⋅m)
Dimensions
Length690 mm (27.2 in)
Width580 mm (22.8 in)
Height495 mm (19.5 in)
Dry weight158 kg (348 lb)

Background

The 102B enabled the team to equal their 1990 points total of three points. With increased sponsorship and the delay of the 107 it was to continue racing for the first four races of the 1992 season in D specification. The C specification incorporated an Isuzu P799WE (Japanese edition) V12 engine that had been developed throughout the season but never raced. The new engine produced impressive power, with rumours of around 750bhp reported. In the engine's one and only track test, the car was six seconds off the pace however.[5] Ultimately, Peter Collins, team principal of Team Lotus, decided against a deal to use the unproven engine and Isuzu decided against entering Formula One anyway.[6]

Specifications
  • Overall length: 690mm
  • Overall width: 580mm
  • Overall height: 495mm
  • Number of cylinders: V-type 12 cylinders
  • Cylinder bank angle (°): 75°
  • Displacement: 3,493cc
  • Maximum horsepower: 646 hp @ 12,000rpm (early), 765 hp @ 13,500rpm (late)
  • Maximum torque: 41.0 kg·m (296.5 lb-ft) @ 10,000 rpm (initial), 42.5 kg·m (308 lb-ft) @ 11,500 rpm (late)
  • Piston: bore 85mm
  • Stroke: 51.3mm
  • Compression ratio: 13.0: 1
  • Weight: 158 kg (348 lbs.)

Applications

References
  1. "That Time Isuzu Made A Formula One Engine And Put It In A Pickup". carthrottle.com. Retrieved 17 November 2021.
  2. "Isuzu's Secret History: F1 Engines, Supercar Concepts, and More". motortrend.com. 7 May 2020. Retrieved 17 November 2021.
  3. "Sidelined Samurai - 1991 Lotus 102C Isuzu". drivetribe.com. Retrieved 17 November 2021.
  4. "Isuzu's V12 monster". drivetribe.com. Retrieved 17 November 2021.
  5. 幻のF1エンジンISUZU P799WE - Autosports Web（2014年12月24日公開/2017年8月12閲覧）
  6. "Sidelined Samurai - 1991 Lotus 102C Isuzu". Carmrades. Archived from the original on 14 December 2019. Retrieved 14 December 2019.
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