HPD LM-V8 engine

HPD LM-V8 Acura/HPD LM-AR6 Acura AL7R
[1]
Overview
Manufacturer	Honda Performance Development
Production	2007-2013
Layout
Configuration	V8, naturally-aspirated, 90° cylinder angle
Displacement	3.4 L (3,397 cc)
Cylinder bore	93 mm (3.66 in)
Piston stroke	62.5 mm (2.46 in)
Cylinder block material	Aluminium
Cylinder head material	Aluminium
Valvetrain	32-valve (four-valves per cylinder), DOHC
RPM range
Max. engine speed	10,000 rpm
Combustion
Fuel system	Gasoline direct injection
Management	Continental/Acura ECU
Fuel type	VP MS100 E10, 100-octane gasoline + 10% ethanol (ALMS)
Oil system	Dry sump
Cooling system	mechanically water cooled
Output
Power output	480  hp (358  kW; 487  PS)
Torque output	450  N⋅m (332  lb⋅ft)

The HPD LM-V8engine (also called the Acura/HPD LM-AR6 and Acura AL7R) is naturally aspirated, four-stroke, 3.4-liter, V8 racing engine, designed and produced by Honda Performance Development (HPD) for use in multiple Le Mans Prototype race cars, from 2007 to 2013. ^{[2] [3] [4]}

In its debut race at the 2007 12 Hours of Sebring, Andretti Green Racing finished first in the LMP2 class and second overall in an Acura ARX-01a-Courage chassis. ^[5]

Design

The LM-V8 was the first engine to be solely designed and developed by HPD in its facilities in Santa Clarita, California. ^[6] The engine is mated to a jointly developed HPD-Hewland 6-speed sequential with manual paddle-operated selection and breathes through a 40.7mm inlet restrictor. ^[7]

Achievements

American Le Mans Series Championships

Year	Team	Chassis	Class
2009	Lowe's Fernández Racing	Acura ARX-01B	LMP2
2010	Patrón Highcroft Racing	HPD ARX-01C	LMP
2012	Muscle Milk Pickett Racing	HPD ARX-03a	P1
2013	Muscle Milk Pickett Racing	HPD ARX-03a	P1

Other Championships/Wins

Year	Series/Event	Team	Chassis	Class	Note
2010	Le Mans Series	RML	Lola B08/80	LMP2	1st in 1000 km of Algarve
2010	24 Hours of Le Mans	Strakka Racing	HPD ARX-01C	LMP2	Qualified on class pole

Applications

• Acura ARX-01a, 01b, 01c, 01e
• HPD ARX-03a, 03c
• Lola B08/80
• Pescarolo 01

References

1. "HPDARX-01eSebring2011-MF19". mulsannescorner.com. Retrieved May 29, 2025.
2. "HPD LM-V8 Engine and ARX-LMP2 Chassis – Information, Specs". blog.hpd.honda.com. July 6, 2010. Archived from the original on December 7, 2024. Retrieved May 29, 2025.
3. "Honda Performance Development" (PDF). hondaracing-us.honda.com. Archived from the original (PDF) on November 12, 2024. Retrieved May 29, 2025.
4. "2007 Acura ARX-01a Specifications". Ultimatecarpage.com. Retrieved May 30, 2025.
5. Beer, Mark (March 17, 2007). "No.2 Audi wins Sebring 12 Hours". autosport.com. Retrieved May 30, 2025.
6. "The Acura Announcement". archive.dailysportscar.com. July 21, 2006. Retrieved May 30, 2025.
7. "Mulsanne's Corner: 2007-2011 Acura/HPD ARX-01a, b, c, d, e, & g". www.mulsannescorner.com. Retrieved May 30, 2025.