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The M838T engine, in a McLaren 12C rolling chassis

The McLaren M838T engine is a 3.8 litre 90 degree twin-turbocharged flat-plane V8, designed and developed in collaboration with Ricardo plc.[1]

Contents

DevelopmentEdit

McLaren bought the rights to the Tom Walkinshaw Racing developed engine (based on the Nissan VRH engine) which was designed for the IRL Indycar championship but never raced. However, other than the 93 mm bore, little of that engine remains in the M838T.[2] In only 18 months, Ricardo went from a clean sheet of paper to a running prototype.[3]

Developed with help from Ricardo, the engine redlines at 8500 rpm, but 80% of the engine's torque is available as low as 2000 rpm.[4][5] McLaren claims that the engine has the highest horsepower to CO2 emission ratio of any current production engine.[6]

The engine is built at Ricardo's engine assembly facility in Shoreham-by-Sea, West Sussex.[7] The turbochargers are supplied by MHI, and are different units from those used in Mitsubishi Lancer Evolutions.[8]

ApplicationsEdit

The engine was designed and built for the McLaren MP4-12C, where it produces 441 kW (592 hp) and 632 N·m (466 ft·lbf). However, in 2012 McLaren released an update increasing power to 459 kW (616 hp). For the GT3 racecar, the engine produces less power at only 368 kW (493 hp).[9]

The engine has a bore and stroke of 93 mm × 69.9 mm (3.661 in × 2.752 in) and a bore spacing of 108 mm (4.252 in).[10]

McLaren and Ricardo redeveloped the M838T engine for use in the McLaren P1. The engine has been upgraded to optimise cooling and durability under higher loads. The engine block has also been modified to incorporate an integrated electric motor as part of a hybrid drive train. The petrol engine produces 542 kW (727 hp) at 7,200 rpm with an additional 131 kW (176 hp) from the electric motor. At 4,000 rpm the engine is said to produce 720 N·m (531 ft·lbf) of torque while the electric motor can produce a maximum of 260 N·m (192 ft·lbf) from 0 rpm upwards.[11]

Models Years Displacement Aspiration Valvetrain Power Torque Redline (rpm) Weight kg (lbs) Fuel Lubricants
P1 2014- 3,799 cc (3.8 L; 231.8 cu in) Twin Turbocharged DOHC 4-valves per cylinder 737 PS (542 kW; 727 hp) @7200 rpm
Electric: 179 PS (132 kW; 177 hp)
720 N·m (531 lbf·ft)
Electric: 260 N·m (192 lbf·ft)
- -
ExxonMobil High Performance Unleaded with Mobil Synergy Fuel System
Mobil 1 Racing fully synthetic 0W-50
675LT Announced 2015 675 PS (496 kW; 666 hp) 700 N·m (516 lbf·ft) - -
650S 2014- 650 PS (478 kW; 641 hp) @7250 rpm 680 N·m (502 lbf·ft) @6000 rpm - -
MP4-12C 2011- September 2012 600 PS (441 kW; 592 hp) @7000 rpm 600 N·m (443 lbf·ft) @3000 rpm 8500 199 (439)
MP4-12C 2013- 625 PS (460 kW; 616 hp) @7500 rpm 600 N·m (443 lbf·ft) 8500 199 (439)
MP4-12C GT3 2011- 500 PS (368 kW; 493 hp) - - -
McLaren 540C 2016- 540 PS (397 kW; 533 hp) 540 N·m (398 lbf·ft) - -
McLaren 570S 2016- 570 PS (419 kW; 562 hp) @7400 rpm 601 N·m (443 lbf·ft) @5000-6500 rpm - -

ReferencesEdit

  1. ^ "McLaren M838T Engine Claims Victory At International Engine Of The Year Awards". McLarenAutomotive.com. Retrieved 4 March 2015. 
  2. ^ Sherman, Don (2011-02-01). "2012 McLaren MP4-12C Tech Trickledown". Car & Driver. US. Retrieved 2017-03-12. 
  3. ^ Crosse, Jesse. "Super car, super engine" (PDF). Ricardo Quarterly Review (Q3 2011). Retrieved 2017-03-12. 
  4. ^ "McLaren MP4-12C First look". Edmunds.com. 2009-10-13. 
  5. ^ "The Official McLaren Automotive Website". 2010-02-03. 
  6. ^ "McLaren MP4-12C - the first official P11 story". 2009-09-08. 
  7. ^ "New Ricardo engine assembly facility commences pilot production". ricardo.com. Retrieved 2011-02-19. 
  8. ^ "Accelerated development: Ricardo-McLaren M838T". Automotive Engineer. 2011-10-19. Retrieved 2013-12-21. 
  9. ^ Dobie, Stephen (2011-05-04). "evo: McLaren MP4-12C GT3 racing car: new pictures and video". EVO. UK. Retrieved 2011-05-05. 
  10. ^ Kavanagh, Jason (2012-09-04). "2012 McLaren MP4-12C: Dyno Tested". Edmunds. Retrieved 2016-09-29. 
  11. ^ "McLaren News - McLaren P1 Twin Power". Retrieved 2011-03-12. 

External linksEdit