1. 2005 Chevy Cobalt Engine Overview

Introduction: The 2005 Chevrolet Cobalt was available with two distinct engine options - a standard 2.2L engine and a high-performance 2.0L supercharged engine in the SS model.

2. Base Model Engine Details

The standard Cobalt came equipped with a 2.2L Ecotec inline-4 engine:

• Displacement: 2204 cc
• Horsepower: 145 hp @ 5600 rpm
• Torque: 155 lb-ft @ 4000 rpm
• Valvetrain: DOHC, 16-valve
• Fuel System: Sequential multi-port fuel injection

3. SS Model Engine Details

The performance-oriented SS model featured a more powerful 2.0L supercharged engine:

• Displacement: 1998 cc
• Horsepower: 205 hp @ 5600 rpm
• Torque: 200 lb-ft @ 4400 rpm
• Supercharger: Eaton M62 roots-type
• Compression Ratio: 9.5:1

4. Technical Comparison

Key Differences:

• The SS engine was smaller in displacement but produced significantly more power
• Supercharger added approximately 60 horsepower over the base model
• SS model included upgraded cooling and exhaust systems
• Different transmission options available for each engine

5. Frequently Asked Questions (FAQ)

Q1: Why did the smaller SS engine produce more power?
A: The supercharger forced more air into the engine, allowing more fuel to be burned and creating greater power output.

Q2: What was the fuel economy difference?
A: The base 2.2L averaged 24 city/32 highway mpg, while the SS averaged 22 city/30 highway mpg.

Q3: Were there any other engine options?
A: For 2005, these were the only two engine choices in North America.

Q4: What type of supercharger was used?
A: The SS used an Eaton M62 roots-type supercharger with an air-to-air intercooler.

Q5: How did these engines compare to competitors?
A: The SS engine was quite competitive, outperforming many naturally aspirated 4-cylinder engines of the era.