USCC: HPD unveils new 3.5-litre Prototype class engine

From press release

Honda Performance Development has announced a new, 3.5-litre 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.

Starwoks Riley DP 24 Hours of Daytona

Starwoks Riley DP (Photo:

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. “We absolutely love working with HPD and have been in collaboration to find a new opportunity to partner with them again.”

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.

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

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