Feb 17

The Skinny on the Dodge Dart Engine and Transmission Choices

I know we’ve talked a lot about the Dart in the last few months, but it’s an important car for Chrysler and it has potential to make a big impact on the market. It’s also going to be used as an introductory platform for some new tech. So, today I got a monster of an email from Chrysler about the new engines and transmissions that are available in the Dart, and I thought I’d pass it on because it’s interesting.

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New Tigershark Engines and Three new powertrains including the Turbo 1.4-litre MultiAir Engine Power 2013 Dodge Dart

All-new Dodge Dart features three new technologically advanced, fuel-efficient and powerful engines
All-new 2.0-litre Tigershark engine to be standard engine for 2013 Dodge Dart
All-new Tigershark 2.4-litre MultiAir and 1.4-litre Turbocharged MultiAir engines available
Transmission choices will include six-speed manual, new six-speed Dual Dry Clutch Transmission (DDCT) and six-speed automatic

February 16, 2012 , Toronto, Ont. – The all-new 2013 Dodge Dart will be powered by three refined, fuel-efficient and powerful, state-of-the-art four-cylinder engines that add to Dart’s fun-to-drive quotient.

Drivers can select from a new Tigershark 16-valve 2.0-litre engine, a 16-valve 1.4-litre MultiAir Intercooled Turbo engine and a new Tigershark16-valve 2.4-litre MultiAir four-cylinder engine.

“The three new engines available in the new Dodge Dart have been designed and tested to meet consumer’s needs for fuel economy, refinement, durability and power in a compact car,” said Bob Lee, Vice President – Engine and Electrified Propulsion Engineering, Chrysler Group LLC. “Technologies, including the latest generation of MultiAir and turbocharging, provide improved fuel economy, reduced emissions and increased power. A forged steel crankshaft, forged connecting rods and select fit main bearings are just a few of the many design features that contribute to the highly refined sound character of these engines.”

The 2013 Dodge Dart will be the first compact sedan built in North America to feature MultiAir engine technology. MultiAir technology delivers optimum combustion at any speed under all driving conditions by allowing direct and dynamic control of air intake and combustion. The result is up to a 15 per cent increase in low engine rpm torque and up to a 7.5 per cent improvement in fuel efficiency.

The new Dart also will feature three transmission choices coupled with the new engines, including a six-speed manual, new six-speed Dual Dry Clutch Transmission (DDCT) and a new six-speed automatic.

These three engines, combined with three transmission choices, redefine performance by providing the most diverse powertrain lineup in the Dart’s class.

2.0-litre Tigershark Engine
The all-new, standard 2.0-litre Tigershark engine brings new levels of fuel efficiency, refinement and performance to Dart. The preliminary performance ratings for the 2.0-litre Tigershark engine are 160 hp at 6,400 rpm and 145 lb-ft of peak torque at 4,800 rpm.

The new engine starts with a lightweight, high-pressure, die-cast aluminum block with cast-iron bore liners and includes a host of features that increase fuel economy and provide quiet operation. A forged steel crankshaft and forged connecting rods, coupled with a cast-iron structural main bearing beam, contribute to an extremely rigid and quiet lower structure. Bore diameter is 88 mm and stroke is 82 mm on the new engine. Total displacement is 1995 cc.

To help reduce noise from the lower reciprocating assembly, the engine is equipped with a steel sandwich type design oil pan that includes acoustic material between the outer and inner steel surface of the pan.

The four-valve, aluminum cylinder head also is new and includes larger, 36 mm intake valves to provide exceptional performance without sacrificing fuel efficiency. Independent variable valve timing on the intake and exhaust side have extended cam phaser range to 60 crankshaft angle degrees of motion.

Port fuel-injection provides precise fuel delivery. Both the intake manifold and fuel rail have acoustically dampened covers that contribute to reduced engine noise in the passenger cabin. Regular fuel with an 87 octane rating is recommended.

The 2.0-litre Tigershark engine is standard on the Dart SE, SXT, Rallye and Limited models.

1.4-litre MultiAir Turbo Engine
For those looking for added performance and a dramatic torque increase, the new Dodge Dart also will be available with a 1.4-litre MultiAir Turbocharged Intercooled engine. The preliminary ratings for the Dart 1.4 MultiAir Turbo engine are 160 hp at 5,500 rpm and 184 lb-ft of torque from 2,500 through 4,000 rpm.

Structurally, the 1.4-litre engine starts with a cast-iron block. Bore is 72 mm and stroke is 84 mm. A forged steel crankshaft is fitted with select fit main bearings and is supported across five main journals. Forged steel connecting rods, which include a unique cross section to minimize longitudinal and lateral bending, also are used for increased durability. Cast-aluminum pistons with a compression ratio of 9.8:1 are used.

The aluminum cylinder head features MultiAir technology. Unlike fixed lobes on a conventional camshaft that control valve lift and duration, the intake valves with the MultiAir system are electro hydraulically controlled. This results in wide flexibility of intake valve openings for better fuel economy and power with lower emissions.

The substantial power level is a result of the turbocharger, which includes a single intercooler. Boost pressure is dynamically managed to provide a broad torque curve over a wide variety of ambient conditions with peak pressure of 22 psi at 4,000 rpm.

2.4-litre Tigershark Engine with MultiAir
Largest of the trio of engines available in the 2013 Dodge Dart, the new 2.4-litre Tigershark engine with MultiAir is the third Chrysler Group engine to feature MultiAir technology. The preliminary ratings for the 2.4-litre Tigershark with MultiAir are 184 horsepower at 6,250 rpm and 171 lb-ft of torque at 4,800 rpm. The engine is slated for availability in the third quarter of 2012.

The new 2.4-litre engine incorporates many of the same features found in the 2.0-litre Tigershark , including a high-pressure, die-cast aluminum block with cast-iron bore liners, forged steel crankshaft and forged connecting rods. Bore diameter is 88 mm and stroke is 97 mm. Total displacement is 2360 cc.

Lightweight cast-aluminum pistons have been designed specifically for lower friction on the 2.4-litre Tigershark engine and provide a 10.1 compression ratio. Maximum engine speed is 6,500 rpm.

The aluminum cylinder head includes a four valves-per-cylinder arrangement with 36 mm intake valves for optimum performance without sacrificing fuel efficiency. MultiAir allows better control of the start and end of the valve events and an extended opening on the intake cycle for better exhaust gas recirculation. Both features improve fuel economy.

Exhaust is through a tubular exhaust manifold that is located in the front of the engine compartment. The location of the exhaust manifold helps decrease the possibility of exhaust noises entering the passenger cabin. Other sound refinement features, including an aluminum head cover, aluminum front engine cover, an acoustically dampened intake manifold and a fuel rail cover, reduce outside engine noise significantly.

2013 Dodge Dart Transmissions
The new 2013 Dodge Dart will feature three transmission choices, including a six-speed manual, a new six-speed DDCT, and a new six-speed automatic.

C635 Six-speed Manual Transmission
Standard on all three engines is the six-speed C635 manual transmission. This state-of-the-art gearbox is designed and built by Fiat Powertrain. Compact and lightweight, the transmission is designed to withstand maximum torque values up to 350 Nm. With six gears, the transmission is designed to operate at a low engine rpm to provide maximum fuel economy. The low operating speed range also reduces noise and provides a quiet cabin environment at highway speeds.

C635 Dual Dry Clutch Six-speed Automatic Transmission
Improved performance and fuel efficiency are just two attributes of Chrysler Group’s new C635 DDCT. The new DDCT will be available exclusively on 2013 Dodge Dart models equipped with the 1.4-litre MultiAir Turbocharged engine.

Designed specifically for lighter vehicle applications, the new DDCT represents the first application of this technology to Chrysler Group front-wheel-drive passenger vehicles. The six-speed DDCT is designed to handle up to 350 Nm of torque.

The new DDCT also includes a hill start assist feature that helps prevent vehicle rollback when the vehicle is on an incline. Working with the brake control unit, the transmission momentarily holds brake pressure until adequate torque is reached to move the vehicle forward.

6F24 Six-speed Automatic Transmission
Small and compact, the Powertech six-speed automatic transmission is fully electronic and is designed for increased fuel efficiency. Torque capacity for the new transmission is 250 Nm.

With a 5.4 gear spread, gear changes are nearly imperceptible at all speeds and optimum shift quality is provided throughout the rpm range, including launch, acceleration and passing at highway speeds. Autostick is standard.

Designed to provide maximum durability, the six-speed automatic is “fill-for-life” and requires no maintenance.

Source: Chrysler Group