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HPD Unveils 3.5-Liter Prototype Engine
February 21, 2014
The Honda HR35TT twin-turbocharged V6 is expected to make its TUDOR United SportsCar Championship debut at the 2014 Mobil1 12 Hours of Sebring, mounted in a Riley Gen3 prototype chassis campaigned by Starworks Motorsport.
HPD Unveils 3.5-Liter Prototype Engine

Honda Performance Development announced a new, 3.5-liter racing application for the versatile, production-based Honda V6 engine found in a wide range of Honda/Acura passenger cars and light trucks and now raced in multiple categories worldwide.

The Honda HR35TT twin-turbocharged V6 is expected to make its TUDOR United SportsCar Championship debut at the 2014 Mobil1 12 Hours of Sebring, mounted in a Riley Gen3 prototype chassis campaigned by Starworks Motorsport.

Previously, Starworks partnered with HPD to win the LMP2 class at the 24 Hours of Le Mans and World Endurance Championship in 2012, using HPD’s ARX-03b chassis and Honda HR28TT twin-turbocharged V6, which also is derived from Honda’s J35 series of engines.

Starworks becomes the second team to utilize Honda power for the new TUDOR championship. Extreme Speed Motorsports campaigns a pair of prototype class HPD ARX-03b Hondas, after a successful initial season with the same package in the 2013 American Le Mans Series.

“This is an exciting program for HPD and our customer teams in the TUDOR United SportsCar Championship,” said Steve Eriksen, HPD Vice President and COO. “Adding Starworks, a team that achieved great success with us in 2012, in a prototype machine alongside the proven HPD-Honda combination run by Extreme Speed Motorsports provides HPD with a strong, balanced attack in the inaugural TUDOR Championship."

“It’s a fantastic feeling to be partnering with Honda once again,” said Starworks team owner Peter Baron. “No doubt we had amazing success with HPD in 2012, but unfortunately it was only a one-year program. We have had numerous conversations over the past two years about building a Daytona Prototype motor and we're thrilled to see it come to fruition. We absolutely love working with HPD and have been in collaboration to find a new opportunity to partner with them again. We will have our work cut out with the steep learning curve to get us to Victory Lane, but HPD brings determination and success to every program it touches. Although HPD already competes in the Prototype class, we feel this is huge step for the TUDOR series and Starworks is thrilled to be part of it."

Starworks Motorsport has compiled an enviable record in Daytona Prototype competition, with five race victories, including back-to-back wins at Indianapolis in 2012 and 2013; and a second-place finish in the Daytona Prototype team championship in 2012, with two victories and six podium finishes. That same year, Starworks became the first American-based prototype team to win an FIA World Championship since 1968, and HPD won its first world title in WEC competition.

The HPD-developed twin-turbocharged Honda engines to be used in the TUDOR championship are both derived from the Honda J35 series of production V6 engines, and include relevant twin-turbocharger technology, along with the efficiency provided by direct fuel injection.
 
The HR35TT is yet another competition application of the ubiquitous J35 engine. The first, the HR28TT, was designed for LMP2 competition and won in its American Le Mans Series debut in 2011. The engine has gone on to record 24 individual race victories and three series titles in the American Le Mans Series, World Endurance Championship and European Le Mans Series Competition.

Other variants of the engine have been raced in Japan’s Autobacs SuperGT Championship, the One Lap of America competitive rally and Pikes Peak International Hillclimb.

Honda HR35TT V6 Engine

Engine Type: Aluminum alloy, twin-turbocharged, direct fuel-injected V6
Displacement: 3.5 liters
Valve Train: Single overhead camshaft, four valves per cylinder
Crankshaft: Alloy steel
Pistons: Forged aluminum, low-friction coatings
Connecting Rods: Machined alloy steel
Engine Management: HPD/McLaren
Ignition System: Digital inductive
Lubrication: Dry sump system
Cooling: Single mechanical water pump
Fuel: E10 100-101 octane gasoline, 10% ethanol.