The HPD LM-V8 engine (also called the Acura/HPD LM-AR6 and Acura AL7R) is a 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.
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.
The LM-V8 was the first engine to be solely designed and developed by HPD in its facilities in Santa Clarita, California. 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.