Honda unveils new 3.5-liter racing engine

[mugencivic4dr]

Honda is following Ford's lead and debuting the second twin-turbocharged V6 to be used by Daytona Prototypes in the United Sports Car Championship. The wait won't be long to see it on track because the new engine will debut with the Starworks Motorsport team in a Riley Gen3 prototype chassis at the 12 Hours of Sebring from March 12-15.

The new HR35TT engine is based on Honda's J35 production V6 found in a variety of its models, including the current Accord. The racing version benefits from dry sump lubrication, but is still similar to the production version with an aluminum block, direct injection and single overhead camshafts. It is fueled by 100-octane E10 fuel, but like many racing engines, exact power figures have not been released.

Starworks has had a close relationship with Honda since it won the LMP2 class at the 24 Hours of Le Mans and in the FIA World Endurance Championship in 2012 with a Honda Performance Development ARX-03b chassis and Honda engine. We can't wait to see this new mill hit the track, and see how it fairs against Chip Ganassi Racing's EcoBoost-powered Riley. Scroll down to read the press release for the full details.

http://www.autoblog.com/2014/02/22/h...ine/#continued

[mugencivic4dr]

Press Release

Honda Performance Development Unveils 3.5-Liter Prototype Engine

02/20/2014 - SANTA CLARITA, Calif.
Starworks Motorsport to Debut HR35TT at Sebring
Latest Racing Application of Production-Based Honda V6 Engine
Two-Team HPD Effort In TUDOR United SportsCar Championship

Honda Performance Development Thursday 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 Performance Development (HPD) is the Honda performance company within North America. Located in Santa Clarita, Calif., HPD is the technical operations center for high-performance Honda racing cars and engines. The company is marking its 20th anniversary in 2013.

As an engine supplier to the IZOD IndyCar Series, Honda has scored 204 race victories in both CART and IZOD IndyCar Series competition since 1994, and powered Scott Dixon to a series-high four victories and the 2013 IZOD IndyCar Series drivers' championship.

HPD offers a variety of race engines for track applications from prototype sports cars to karting; and showcases "fun-to-drive" products for professional, amateur and entry-level racers.

For a photograph of the Honda HR35TT V6, go to:
http://broadcast.sportssystems.com/h...cfm?key=101706

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

[Raf99]

Cool. I'm assuming that's the water pump below the first turbo on a pulley?

[Jarrett]

No, that's the dry sump oil circulation pump.


Before I read that the excerpt I noticed that the common exhaust port looked nearly identical to the second generation J-series heads. Then the block webbing looks VERY similar to my J32A2 and J35A3 blocks.

If this thing is direct-injected then it's likely based off of the the J35Y4 found in the 2014+ Acura RLX.

These are its specs in a naturally-aspirated production application:

J35Y4
2014+ Acura RLX
Displacement: 3,476 cc (212.1 cu in)
Bore and stroke: 89.7 mm (3.5 in) x 92.3 mm (3.6 in)
Compression: 11.5:1
Power: 310 hp (230 kW) @ 6,500 rpm
Torque: 272 lb·ft (369 N·m) @ 4,500 rpm
Valvetrain: 24v SOHC VTEC (VTEC on intake and exhaust valves)
Red Line: 6,800 rpm
Fuel cutoff: 7,200 rpm
Induction/Fuel Delivery: Naturally Aspirated - Direct Injection

[Raf99]

No, that's the dry sump oil circulation pump.


Before I read that the excerpt I noticed that the common exhaust port looked nearly identical to the second generation J-series heads. Then the block webbing looks VERY similar to my J32A2 and J35A3 blocks.

If this thing is direct-injected then it's likely based off of the the J35Y4 found in the 2014+ Acura RLX.

These are its specs in a naturally-aspirated production application:

J35Y4
2014+ Acura RLX
Displacement: 3,476 cc (212.1 cu in)
Bore and stroke: 89.7 mm (3.5 in) x 92.3 mm (3.6 in)
Compression: 11.5:1
Power: 310 hp (230 kW) @ 6,500 rpm
Torque: 272 lb·ft (369 N·m) @ 4,500 rpm
Valvetrain: 24v SOHC VTEC (VTEC on intake and exhaust valves)
Red Line: 6,800 rpm
Fuel cutoff: 7,200 rpm
Induction/Fuel Delivery: Naturally Aspirated - Direct Injection

And dual turbo's on it. Yum. I'm guessing 600hp+. And I don't ask too many dumb question but think I will ask. What's the purpose of a dry sump oil pump and how does it work?

[XCRN]

There is no oil in a reserve like an oil pan. It just keep circulating through the system.
I could wrong or too vague but that is my understanding.

[steelbluesleepR]

There is no oil in a reserve like an oil pan. It just keep circulating through the system.
I could wrong or too vague but that is my understanding.

that's it. instead of being a "wet sump" like our engines and 99% of the other motors in the world, a dry sump keeps oil in a tank separate from the motor and pumps it to the places in the motor that need it.

This frees up power (the crank doesn't have to deal with the drag and power loss of splashing through what is essentially a puddle of oil at the bottom of the motor. It also gets rid of the big sump at the bottom of the motor, allowing the engine to sit further down, lowering the center of gravity for the vehicle and improving packaging possibilities. Lastly, the remote tank can store and filter much more oil than would be feasible in a traditional wet-sump. This allows for better oil cooling, filtration, and a decrease in the likelihood of contamination of the oil.

[Raf99]

that's it. instead of being a "wet sump" like our engines and 99% of the other motors in the world, a dry sump keeps oil in a tank separate from the motor and pumps it to the places in the motor that need it.

This frees up power (the crank doesn't have to deal with the drag and power loss of splashing through what is essentially a puddle of oil at the bottom of the motor. It also gets rid of the big sump at the bottom of the motor, allowing the engine to sit further down, lowering the center of gravity for the vehicle and improving packaging possibilities. Lastly, the remote tank can store and filter much more oil than would be feasible in a traditional wet-sump. This allows for better oil cooling, filtration, and a decrease in the likelihood of contamination of the oil.

So why don't modern cars have dry sump pumps? ie - the 2014 acura with the same block probably has a wet sump pump. (i'm thinking they don't want to deal with the cost of change)

[Jarrett]

It's expensive to fit a car with the entire assembly including all of the external plumbing, it's noisy and oil stays much cooler than needed for colder environments. Basically, it works too well for street usage unless the operator understands the different nuances of the system and how to cope with them.

[illinois_erik]

They have dry sumps for F/H's although expensive.(more or less depending on the company producing it) I was looking to do that but its about 3 grand. A k24 dry sump system is about 3700$

F/H



F20C/F22C1

[Raf99]

Good to know. Thanks guys

[steelbluesleepR]

So why don't modern cars have dry sump pumps? ie - the 2014 acura with the same block probably has a wet sump pump. (i'm thinking they don't want to deal with the cost of change)

The C6 Z06 has a dry sump, as do many supercars.

[owequitit]

It's expensive to fit a car with the entire assembly including all of the external plumbing, it's noisy and oil stays much cooler than needed for colder environments. Basically, it works too well for street usage unless the operator understands the different nuances of the system and how to cope with them.

It's also cheaper and a lot less maintenance.

Aerobatic airplanes have systems that are sort of like dry sumps, in that they route oil outside the engine through a system of tanks and valves so they can reverse the flow of oil when inverted. The number of additional fittings, hoses, gaskets and parts that can leak/deteriorate/break is probably 10 fold compared to a wet sump which basically has the pan and pan gasket. LOL.