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The Chevrolet Stovebolt engine is a straight-six engine made in two versions between 1929 and 1962 by the Chevrolet Division of General Motors. It replaced the company's 171-cubic-inch (2.8 L) inline-four as their sole engine offering from 1929 through 1954, and was the company's base engine starting in 1955 when it added the small block V8 to the lineup. It was completely phased out in North America by 1962, but GM continued to build it in Brazil until 1979. It was replaced by the Chevrolet Turbo-Thrift engine.

Chevrolet Stovebolt engine
Overview
ManufacturerGeneral Motors Corporation
Also calledStovebolt Six
Cast-Iron Wonder
Production1929–1962 North America
1964–1979 Brazil
Layout
ValvetrainOHV, 2 valves per cylinder
Combustion
Fuel typeGasoline
Cooling systemWater-cooled
Chronology
Predecessor171 Straight-4
SuccessorChevrolet Turbo-Thrift engine


First generation: 1929–1936


First Generation
Overview
Production1929–1936
Layout
Displacement194 cu in (3.2 L)
181 cu in (3.0 L)
207 cu in (3.4 L)
Cylinder bore3+5⁄16 in (84 mm)
Piston stroke3+1⁄2 in (88.9 mm)
3+3⁄4 in (95.25 mm)
4 in (101.6 mm)
ValvetrainOHV, 2 valves per cylinder
Combustion
Oil system"splash" lubrication for the rod bearings and pressurized lubrication to the three main bearings.
Cooling systemWater-cooled
Output
Power output50 hp (37 kW) 1929–1931 194
60 hp (45 kW) 1932–1933 194
80 hp (60 kW) 1934–1936 194
Chronology
Predecessor171 Straight-4

"A six for the price of a four"


The new six-cylinder engine was introduced in 1929 Chevrolet cars and trucks, replacing the company's first inline-4. The 1927 Chevrolet Series AA Capitol had sold very well—over a million units sold as compared to about 400,000 of Ford's Model T—but Ford had introduced a new model in the autumn of 1927: the Model A. The Model A, with its improved 40 hp (30 kW) four-cylinder, compared much more favourably to the 27 hp (20 kW) Series AA Capitol, and sales of the Model A surpassed Chevrolet by 1929.[1]: 14  Chevrolet had been considering switching to a six-cylinder engine since 1925, and the ascendency of the Model A precipitated the switch. Chevrolet had long been known for its "valve-in-head" design in the previous four-cylinder engine, so General Manager William S. Knudsen and marketing executive Richard Grant insisted that the new six-cylinder design also use overhead valves. The new engine was mockingly called the "Cast-Iron Wonder" and "Stovebolt Six" for its seemingly old-fashioned design,[1]: 12–14  but it was famously advertised as "a six for the price of a four" to great success: the Chevrolet was priced only $100 more than the Model A, and the brand regained the sales lead from Ford in 1931.[1]: 12–14 


194


When introduced in 1929 the six-cylinder was 193.9 cubic inches (3.2 L) in size and produced 46 hp (34 kW). This engine used a forged steel crankshaft with three main bearings and cast-iron pistons. Bore and stroke was 3+5⁄16 in × 3+3⁄4 in (84 mm × 95 mm).

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

This engine was used in all Chevrolet passenger cars from 1929 through 1932.

Applications:


207


1933 Chevrolet L6 engine
1933 Chevrolet L6 engine

The original 194 CID engine was replaced with an improved 206.8-cubic-inch (3.4 L) variant (the stroke was increased to 4 inches (101.6 mm)) in 1933, introduced in the Series CA Eagle. This newly revised engine put out 65 hp (48 kW), and was produced until 1936.

Toyota's first engine, the Type A produced from 1935 to 1947, was a reverse engineered copy of the 206.8 cubic inches (3.4 L) Chevrolet engine.[3]

Applications:


181


A 181-cubic-inch (3.0 L) (3+5⁄16 by 3+1⁄2 inches (84 mm × 89 mm)) version was also introduced in 1933, in the lower priced Series CC Standard, and used again in the 1934 Series DC Standard. It made a peak 60 hp (45 kW) at 2300 rpm, and peak torque of 125 lb⋅ft (169 N⋅m) at 1200-2000 rpm. The compression ratio in the 1933 model was 5.2:1, and was increased to 5.35:1 in 1934. Production of this version ended after 1934, and the Standard used the 206.8 cubic inch engine thereafter.


Second generation: 1937–1962


Second generation
Overview
Production1937-1963 US
1964-1979 Brazil
Layout
Displacement216 cu in (3.5 L)
235 cu in (3.9 L)
261 cu in (4.3 L)
Cylinder bore3+1⁄2 in (88.9 mm)
3+9⁄16 in (90.5 mm)
3+3⁄4 in (95.25 mm)
Piston stroke3+3⁄4 in (95.25 mm)
3+15⁄16 in (100 mm)
ValvetrainOHV, 2 valves per cylinder
Compression ratio6.5:1 to 8.25:1
Combustion
Cooling systemWater-cooled
Output
Power output85 hp (63 kW) to 155 hp (116 kW)

The Stovebolt engine was significantly re-engineered for the 1937 model year, distinguished from the earlier 1929-1936 engines by having a redesigned crankcase with four main bearings in lieu of the older engine's three bearings. It is often known as the "Blue Flame" engine, although that name was only officially applied beginning in 1953, and then only for the 235ci version coupled to the Powerglide automatic transmission (including in the Corvette).[9]


216


This engine had a 216.48-cubic-inch (3.5 L) displacement with a bore and stroke of 3+1⁄2 by 3+3⁄4 inches (88.90 mm × 95.25 mm). A four-bearing crankshaft was added, along with 6.5:1 compression pistons, for 85 hp (63 kW). A new cylinder head in 1941 increased output to 90 hp (67 kW), and 6.6:1 compression gave the 1949 model 92 hp (69 kW). This generation did not use a fully pressurized oiling system. The connecting rods were oiled using an "oil trough" built into the oil pan that had spray nozzles that squirted a stream of oil at the connecting rods (which were equipped with "dippers"), thus supplying oil to the rod bearings.

Rod bearings were made of babbitt cast integral with the rod. The bearing was adjustable for wear by removing copper shims placed between the rod cap and connecting rod. In this way specified oil clearance could be maintained. If the crankshaft were to be turned undersized, or if the bearing was damaged or worn out, rod and bearing were replaced as a unit, typically at the dealership.[citation needed]

This engine was also used in GM's British Bedford truck. In the late 1930s rival Austin decided to get into the 2-3 ton truck ("lorry") market and in a crash program based the design on the basic architecture of this "Stove Bolt" engine, except that they added detachable shell main and con-rod bearings and pressurized lubrication. That Austin engine, in six-cylinder form, post war known as the Austin D-Series, went on to power cars such as the Austin Sheerline and Princess, and the Jensen Interceptor and 541. Austin also lopped off two cylinders to create the BS1 engine and in that form various versions, with various capacities, powered cars such as the Austin 16, A70 Hampshire and Hereford, A90 Atlantic, the Austin-Healey 100-4 and the Austin Gipsy, a generation of commercial vans, as well as some models of the iconic London black taxi (FX3 and FX4).

Year Compression Ratio Power Torque Notes Reference
1937-19406.25:185 hp (63 kW) @ 3200 rpm170 lb⋅ft (230 N⋅m) @ 1200 rpmpassenger cars[10][11][12][13]
78 hp (58 kW) @ 3200 rpm168 lb⋅ft (228 N⋅m) @ 1100 rpmtrucks
1941-19426.5:190 hp (67 kW) @ 3300 rpm174 lb⋅ft (236 N⋅m) @ 1200-2000 rpmall except COE trucks[14][15]
87 hp (65 kW) @ 3300 rpm172 lb⋅ft (233 N⋅m) @ 1200-2000 rpmCOE trucks
1946-194890 hp (67 kW) @ 3300 rpm174 lb⋅ft (236 N⋅m) @ 1200-2000 rpmThriftmaster[16][17][18][19][20][21]
19496.6:1[22][23]
1950-195392 hp (69 kW) @ 3400 rpm176 lb⋅ft (239 N⋅m) @ 1000-2000 rpm[24][25][26][27][28][29][30][31]



235


1953 Corvette Blue Flame
1953 Corvette Blue Flame

In 1941 a 235.5-cubic-inch (3,859 cc) version of the 216 engine was introduced for use in large trucks. Both the bore and stroke of (3+9⁄16 in × 3+15⁄16 in (90 mm × 100 mm) were increased over the 216. This engine also had an oil "dipper system" as described above, in reference to the oiling system, as in the 216.

The 235 was introduced to the Chevy passenger car line in 1950, coupled to the new Powerglide automatic transmission, and 3.55:1 rear differential. The new version used with the Powerglide transmission featured hydraulic lifters and larger intake valves to produce more power. The pushrod cover on the side of the engine also no longer extended across the cylinder head, to eliminate oil leaks.[32]: 89  In 1953 the 235 engine became standard equipment in all Chevrolet passenger cars (except the sedan delivery body, which continued to use the older 216 until 1954), but when coupled to the standard three-speed manual transmission (called Thrift-King in that guise) it featured solid lifters and lower power output: 108 hp (81 kW) versus 115 hp (86 kW) with the Powerglide.

A fully pressurized lubrication system with shell type main bearings in lieu of poured babbitt and aluminum pistons were also introduced in 1953, but only in the higher-output Blue Flame version in cars ordered with the Powerglide transmission.[32]: 102  The alleged benefits of a "blue flame" rather than yellow had been touted in Chevrolet advertising since 1934.[9] The 1953 Corvette used a unique version of the high-pressure 235 engine with mechanical lifters, the same slightly higher-lift camshaft as used in the 261 truck engine and three single-barrel, side-draft Carter Model YH carburetors to produce 150 hp (112 kW).

From 1954 to 1962, the high-pressure 235 engine with solid lifters was used in some trucks. From 1956 to 1962, all 235 engines used in cars had hydraulic lifters.

The 235 is known as one of the great Chevrolet engines, noted for its power and durability. It was replaced by the third generation 230, beginning in 1962.

Canadian-production GMC trucks also used the 216 and 235 Chevrolet straight-six engines as their base light-duty truck powerplant in the late 1940s and early 1950s. The 216 was used from 1947 to 1953, and the 235 was used in 1954 light-duty trucks only. Medium-duty GMC trucks used US built GMC engines in the 248, 270, and up sizes prior to 1954.

Year Compression Ratio Power Torque Notes Reference
1941-19486.62:193 hp (69 kW) @ 3100 rpm192 lb⋅ft (260 N⋅m) @ 1000-1900 rpmall applications except COE trucks[14][15][17][19][21]
90 hp (67 kW) @ 3100 rpm189 lb⋅ft (256 N⋅m) @ 1000-1900 rpmCOE trucks
19496.7:193 hp (69 kW) @ 3100 rpm192 lb⋅ft (260 N⋅m) @ 1000-1900 rpmall applications except COE trucks[23]
90 hp (67 kW) @ 3100 rpm189 lb⋅ft (256 N⋅m) @ 1000-1900 rpmCOE trucks
1950-1952105 hp (78 kW) @ 3600 rpm193 lb⋅ft (262 N⋅m) @ 2000 rpmpassenger cars with Powerglide transmission;
4000, 6000-series heavy-duty trucks		[24][25][26][27][28][29]
100 hp (75 kW) @ 3500 rpm190 lb⋅ft (258 N⋅m) @ 2000 rpm5000-series COE trucks[25][27][29]
92 hp (69 kW) @ 3400 rpm182 lb⋅ft (247 N⋅m) @ 1500-1900 rpm3700-series Dubl-Duti vans
19538.0:1150 hp (112 kW) @ 4200 rpm223 lb⋅ft (302 N⋅m) @ 2400 rpmCorvette Blue Flame Special[33]
7.5:1115 hp (86 kW) @ 3600 rpm200 lb⋅ft (271 N⋅m) @ 2000 rpmpassenger cars with Powerglide transmission[30]
7.1:1108 hp (81 kW) @ 3600 rpm200 lb⋅ft (271 N⋅m) @ 2000 rpmpassenger cars with manual transmission;
4000, 6000-series heavy-duty trucks		[31]
107 hp (80 kW) @ 3600 rpm192 lb⋅ft (260 N⋅m) @ 2000 rpm5000-series COE trucks,
3700-series Dubl-Duti vans
19548.0:1155 hp (116 kW) @ 4200 rpm225 lb⋅ft (305 N⋅m) @ 2800 rpmCorvette Blue Flame 150 (new camshaft introduced mid-year)[34]
150 hp (112 kW) @ 4200 rpm223 lb⋅ft (302 N⋅m) @ 2400 rpmCorvette Blue Flame 150
7.5:1125 hp (93 kW) @ 4000 rpm200 lb⋅ft (271 N⋅m) @ 2000 rpmpassenger cars with Powerglide transmission[35]
115 hp (86 kW) @ 3700 rpm200 lb⋅ft (271 N⋅m) @ 2000 rpmpassenger cars with manual transmission
112 hp (84 kW) @ 3700 rpm200 lb⋅ft (271 N⋅m) @ 2000 rpmall trucks except COE[36]
107 hp (80 kW) @ 3600 rpm192 lb⋅ft (260 N⋅m) @ 2000 rpmCOE trucks, Dubl-Duti vans
19558.0:1155 hp (116 kW) @ 4200 rpm225 lb⋅ft (305 N⋅m) @ 2800 rpmBlue Flame 150 (Corvette, in limited numbers)
7.5:1136 hp (101 kW) @ 4200 rpm209 lb⋅ft (283 N⋅m) @ 2200 rpmBlue Flame 136 (passenger cars with Powerglide transmission)[37]
123 hp (92 kW) @ 3800 rpm207 lb⋅ft (281 N⋅m) @ 2000 rpmBlue Flame 123 (passenger cars with manual transmission)
Thriftmaster (light and medium-duty trucks)
Loadmaster (heavy-duty trucks)		[37][38]
1956-19578.0:1140 hp (104 kW) @ 4200 rpm210 lb⋅ft (285 N⋅m) @ 2400 rpmBlue Flame 140 (passenger cars)
Thriftmaster (light and medium-duty trucks)
Loadmaster (heavy-duty trucks)		[39][40][41][42]
19588.25:1145 hp (108 kW) @ 4200 rpm215 lb⋅ft (292 N⋅m) @ 2400 rpmBlue Flame 145 (passenger cars)
Thriftmaster (trucks)		[43][44]
1959-1962135 hp (101 kW) @ 4000 rpm217 lb⋅ft (294 N⋅m) @ 2000-2400 rpmHi-Thrift (passenger cars)
Hi-Thrift 235 (1962)		[45][46][47][48]
217 lb⋅ft (294 N⋅m) @ 2000 rpmThriftmaster (trucks)[49][50][51][52]
110 hp (82 kW) @ 3200 rpm210 lb⋅ft (285 N⋅m) @ 1600 rpmThriftmaster economy option

261


In 1954, a 260.9-cubic-inch (4.3 L) truck engine was introduced as an optional Jobmaster engine for heavy-duty trucks. This engine was very similar to the 235 engine, except for a different block casting with a larger piston bore of 3+3⁄4 inches (95.25 mm), two extra coolant holes (in the block and head) between three paired (siamesed) cylinders, and a slightly higher lift camshaft. This engine was offered as a step up from the 235 starting in 1954. It was offered in parallel with the GMC V6 engine in 1960 until 1963, when it was discontinued. The 261 US truck engine had mechanical lifters and was available from 1954 to 1962.

The 235 and 261 truck engines were also used by GMC Truck of Canada (GMC truck 6-cylinder engines were also used in Canada). The 1955–1962 Canadian full-size Pontiac car had a standard 261-cubic-inch engine that had hydraulic lifters. This engine was not sold in the US, but was very similar to the US truck 261.

The 261 engines were also used in light trucks and the Chevrolet Veraneio from 1958 to 1979 in Brazil. Produced 148hp.

Year Compression Ratio Power Torque Reference
1954-557.17:1135 hp (101 kW) @ 4000 rpm220 lb⋅ft (298 N⋅m) @ 2000 rpm[36][38]
1956-577.8:1148 hp (110 kW) @ 4000 rpm232 lb⋅ft (315 N⋅m) @ 2000 rpm[40][42]
1958-19628.0:1150 hp (112 kW) @ 4000 rpm235 lb⋅ft (319 N⋅m) @ 2000 rpm[44][49][50][51][52]

See also



References


  1. "Chevrolet: 1911-1996" (pdf). General Motors Heritage Center.
  2. "Chevrolet 1934 Passenger Car Engineering Features - Master" (pdf). General Motors Heritage Center.
  3. Hall, Bob (March–April 1977). "Japan's Toyota with Stovebolts". Special-Interest Autos. No. 39. Bennington, VT. pp. 20–21.
  4. "Chevrolet Trucks 1933" (pdf). General Motors Heritage Center.
  5. "Chevrolet Trucks 1934" (pdf). General Motors Heritage Center.
  6. "Chevrolet 1935" (pdf). General Motors Heritage Center.
  7. "Chevrolet 1936" (pdf). General Motors Heritage Center.
  8. "Chevrolet Trucks 1936" (pdf). General Motors Heritage Center.
  9. Leroux, Bruno (2012-11-15). "Le saviez-vous?" [Did you know?]. La Vie de l'Auto (in French). Fontainebleau Cedex, France: Éditions LVA (1533): 8.
  10. "1937 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 31.
  11. "1938 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 38.
  12. "1939 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 46.
  13. "1940 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 50.
  14. "1941 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 122.
  15. "1942 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 42.
  16. "1946 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 29.
  17. "1946 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 36.
  18. "1947 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 70.
  19. "1947 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 49.
  20. "1948 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 35.
  21. "1948 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 40.
  22. "1949 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 24.
  23. "1949 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 31.
  24. "1950 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. pp. 28, 44.
  25. "1950 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 76.
  26. "1951 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. pp. 46, 76.
  27. "1951 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 38.
  28. "1952 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. pp. 32, 48.
  29. "1952 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 92.
  30. "1953 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. pp. 33, 51.
  31. "1953 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 100.
  32. Bell, Doug (1961). Cast-Iron Wonder: Chevrolet's Fabulous Six. Los Angeles: Floyd Clymer Publications. Retrieved 2021-12-30.
  33. "1953 Chevrolet Corvette Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 3.
  34. "1954 Chevrolet Corvette Vehicle Information Kit" (pdf). General Motors Heritage Center. pp. 2, 9.
  35. "1954 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. pp. 34, 51.
  36. "1954 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 102.
  37. "1955 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 66.
  38. "1955 Chevrolet Truck 2nd Series Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 184.
  39. "1956 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 34.
  40. "1956 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 83.
  41. "1957 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 32.
  42. "1957 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. pp. 99, 105.
  43. "1958 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 43.
  44. "1958 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. pp. 35, 41.
  45. "1959 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 25.
  46. "1960 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 56.
  47. "1961 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 55.
  48. "1962 Chevrolet Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 60.
  49. "1959 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. p. 68.
  50. "1960 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. pp. 131–134.
  51. "1961 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. pp. 141–149.
  52. "1962 Chevrolet Truck Vehicle Information Kit" (pdf). General Motors Heritage Center. pp. 121–124.




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