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Blue Flame (engine)

Straight 6
Overview
Manufacturer General Motors Corporation
Production 1929–1990 North America
2002–2009 (Atlas LL8) North America
1962–2001 Brazil
Combustion chamber
Valvetrain OHV
Combustion
Fuel type gasoline
Cooling system water-cooled
Chronology
Predecessor 171 Straight-4
Successor General Motors 90° V6 engine
First Generation
1929 Chevrolet 2-door sedan engine.JPG
Overview
Production 1929–1936
Combustion chamber
Displacement 194 cu in (3.2 L)
181 cu in (3.0 L)
207 cu in (3.4 L)
Cylinder bore 3.3125 in (84 mm)
Piston stroke 3.75 in (95 mm)
Valvetrain OHV
Combustion
Oil system "splash" lubrication for the rod bearings and pressurized lubrication to the three main bearings.
Cooling system Water-cooled
Output
Power output 50 hp (37 kW) 1929–1931 194
60 hp (45 kW) 1932–1933 194
80 hp (60 kW) 1934–1936 194
Chronology
Predecessor 171 Straight-4
Second generation
Overview
Production 1937–1963 US
-1964 Brazil
Combustion chamber
Displacement 216 cu in (3.5 L)
235 cu in (3.9 L)
261 cu in (4.3 L)
Cylinder bore 3.500 in (88.9 mm)
3.5625 in (90.5 mm)
3.750 in (95.2 mm)
Piston stroke 3.750 in (95.2 mm)
3.9375 in (100 mm)
Valvetrain OHV
Compression ratio 6.5:1
6.6:1
7:1
Combustion
Cooling system Water-cooled
Output
Power output 85 hp (63 kW)
90 hp (67 kW)
92 hp (69 kW)
123 hp (92 kW)
136 hp (101 kW)
150 hp (112 kW)
Third generation
Chevrolet third-generation inline-six (Camaro).jpg
Overview
Production 1962—1990
1964—2001 (Brazil)
Combustion chamber
Displacement 194 cu in (3.2 L)
230 cu in (3.8 L)
250 cu in (4.1 L)
292 cu in (4.8 L)
Cylinder bore 3.563 in (90.5 mm)
3.875 in (98.4 mm)
3.875 in (98.4 mm)
3.875 in (98.4 mm)
Piston stroke 3.250 in (82.6 mm)
3.250 in (82.6 mm)
3.530 in (89.7 mm)
4.120 in (104.6 mm)
Valvetrain OHV
Combustion
Cooling system Water-cooled
Dimensions
Length 32.5 in (830 mm)

The Chevrolet inline 6 otto engine was Chevrolet's sole engine from 1929 (when it replaced their first 4-cylinder engine, the 171-cubic-inch four), through 1954, and was the base engine starting in 1955 when they added the small block V8 to the lineup. It had finally been completely phased out by 1990 in North America, but in Brazil, GM held on to their fuel-injected version through the 1998 model year. It was replaced by more recently developed V6 and four-cylinder engines. Many popular cars and trucks, including the Chevrolet Camaro, Chevrolet Impala, and Chevrolet Suburban used the inline 6 as the base engine. Chevrolet did not offer another inline 6 until the 2002 General Motors Atlas engine's debut in the Chevrolet TrailBlazer.

The first mass-produced GM inline 6 was introduced in 1929 on Chevrolet cars and trucks, replacing the company's first inline-4. Richard Grant (Chevrolet marketing executive) insisted that the new design boast overhead valves. Chevrolet had long been known for its "valve-in-head" four-cylinder engines. William S. Knudsen's cast-iron wonder was produced through 1936.

It was 193.9 cubic inches (3.2 L) in size and produced 50 hp (37 kW). This engine used a forged steel crankshaft with three bearings and cast-iron pistons. Bore and stroke was 3.3125 in (84.14 mm) by 3.75 in (95.25 mm). The 194 was shared with Chevrolet and GMC trucks for 1935 and 1936.

A balanced crankshaft was introduced for 1932, while a higher (5.2:1) compression ratio upped output to 60 hp (45 kW). Applications:


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