Pontiac straight-6 engine
Script error: No such module "Unsubst". Template:Infobox automobile engine The Pontiac straight-6 engine is a family of inline-six cylinder automobile engines produced by the Pontiac Division of General Motors Corporation in numerous versions beginning in 1926.
"Split Head" Six
186
In the 1920s Oakland Motor Car engineers designed an all new engine for their "companion" make, the Pontiac, that was introduced in 1926. It was a side-valve design with a one piece cast iron block with three main bearings. An unusual feature was that it had two separate cylinder heads that each covered three cylinders. The ignition distributor was mounted on top of the block in the gap between the heads. This engine was also used in GMC's 1927 T-10 and 1928 T-11 (their lightest trucks) as well as their next lightest truck, the T-19, beginning in 1928.[1] Development of the engine shared characteristics with the Oldsmobile Straight-6 engine, as GM worked together to develop the engine for Pontiac combined with the resources of GM-Northway Motor and Manufacturing Division.
This engine displaced Script error: No such module "convert". with a bore and stroke of Script error: No such module "convert". and was rated at Script error: No such module "convert". at 2400 rpm when it was introduced. The compression ratio was 4.8:1.[2]
200
In 1929, the "split head" Pontiac six was increased in displacement to Script error: No such module "convert".. The horsepower rating increased to Script error: No such module "convert". @ 3000 rpm. Compression was increased slightly to 4.9:1.[2] The "split-head" six was discontinued by Pontiac at the end of the 1932 model year. Pontiac offered only eight-cylinder engines during 1933 and 1934. GMC also switched to the 200 cubic inch engine in 1929, using it into early in the 1933 model year.
Flathead Six
208
In 1935, Pontiac re-introduced their six-cylinder engine, as a Script error: No such module "convert". straight-6. The 208 was produced in 1935 and 1936. It was a side-valve design with a timing chain, as was popular at the time. This engine featured a conventional one piece cylinder head, and the distributor was moved to the side of the block. The number of main bearings was increased to four. Like the Pontiac Straight-8 engine it also featured full-pressure oiling and insert type precision main and rod bearings. These two latter features greatly increased longevity and durability especially under high speed conditions.
223 Pontiac/GMC
The 223 was a side-valve engine, and used a timing chain. The Script error: No such module "convert". straight-6 was used in Pontiac automobiles (1937–40) and GMC trucks (1938 only).
239
The Script error: No such module "convert". straight-6 was similar in design to previous sixes. It was used from 1941 through 1954 only in Pontiac automobiles.
Specifications
| Year | Model name (number) | Displacement | Output | Torque | Compression | Carburetor series (bbl) | |
|---|---|---|---|---|---|---|---|
| 1935 | Master & DeLuxe 6 (6-35) | Script error: No such module "convert". | Script error: No such module "convert". @ 3600 rpm |
Script error: No such module "convert". @ 1600 rpm |
6.2:1 | Carter W-1 (1) | [3] |
| 1936 | Master & DeLuxe 6 (6-36) | [3] | |||||
| 1937 | Six (6-37) | Script error: No such module "convert". | Script error: No such module "convert". @ 3520 rpm |
Script error: No such module "convert". @ 1600 rpm |
[3] | ||
| 1938 | Six (6-38) | [3] | |||||
| 1939 | Quality & DeLuxe 6 (39-25) & (39-26) | Carter WA-1 (1) | [3] | ||||
| 1940 | Special & DeLuxe 6 (40-25) & (40-26) | Script error: No such module "convert". @ 3520 rpm |
Script error: No such module "convert". @ 1400 rpm |
6.5:1 | [3] | ||
| 1941 | Custom, DeLuxe & Streamliner Torpedo 6 (41-24), (41-25), & (41-26) | Script error: No such module "convert". | Script error: No such module "convert". @ 3200 rpm |
Script error: No such module "convert". @ 1400 rpm |
[3] | ||
| 1942 | Torpedo & Streamliner Torpedo 6 (42-25) & (42-26) | [3] | |||||
| 1946 | Torpedo & Streamliner 6 (46-25) & (46-26) | Script error: No such module "convert". @ 3400 rpm |
[3] | ||||
| 1947 | Torpedo & Streamliner 6 (47-25) & (47-26) | [3] | |||||
| 1948 | Torpedo & Streamliner 6 (48-25) & (48-26) | Script error: No such module "convert". @ 1400 rpm |
[3] | ||||
| 1949 | Silver Streak 6 (49-25) | [3] | |||||
| 1950 | Silver Streak 6 (50-25) | Script error: No such module "convert". @ 3400 rpm |
Script error: No such module "convert". @ 1200 rpm |
[3] | |||
| 1951 | Silver Streak 6 (51-25) | Script error: No such module "convert". @ 3400 rpm |
Script error: No such module "convert". @ 1200 rpm |
[3] | |||
| 1952 | Silver Streak 6 (52-25) with manual trans. | Script error: No such module "convert". @ 3400 rpm |
Script error: No such module "convert". @ 1400 rpm |
6.8:1 | [3] | ||
| 1952 | Silver Streak 6 (52-25) with automatic trans. | Script error: No such module "convert". @ 3400 rpm |
7.7:1 | [3] | |||
| 1953 | Chieftain 6 (53-25) with manual trans. | Script error: No such module "convert". @ 3800 rpm |
Script error: No such module "convert". @ 2000 rpm |
7.0:1 | Carter WCD (2) | [3] | |
| 1953 | Chieftain 6 (53-25) with automatic trans. | Script error: No such module "convert". @ 3800 rpm |
7.7:1 | [3] | |||
| 1954 | Chieftain 6 (54-25) with manual trans. | Script error: No such module "convert". @ 3800 rpm |
7.0:1 | [4] | |||
| 1954 | Chieftain 6 (54-25) with automatic trans. | Script error: No such module "convert". @ 3800 rpm |
7.7:1 | [4] |
Overhead Valve
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215
A Script error: No such module "convert". overhead valve straight-6 was produced in 1964 and 1965 but was not an original Pontiac design. Sometimes confused with the Buick designed and built Script error: No such module "convert". aluminum V8 that Pontiac had used in the two years prior, the "Pontiac 215" was an adaptation of Chevrolet's 194 cu.in. inline 6 currently produced and the new Script error: No such module "convert". overhead valve Turbo-Thrift straight-6. Quite different from Pontiac's previous straight-6s, it had a smaller bore Script error: No such module "convert". than the Script error: No such module "convert". larger Chevrolet engine and a Chevy bellhousing, but its flywheel/flexplate bolt pattern was Pontiac's.
Overhead cam
230
A single overhead camshaft (SOHC) design was introduced by Pontiac in the 1966 model year as the standard engine in the Tempest. Offered also in 1967, the Script error: No such module "convert". OHC 6 shared internal dimensions with the overhead valve Chevrolet straight-6 engine it was based on,Script error: No such module "Unsubst". but had unique cast iron block and head castings. Only the large cam carrier/valve cover was aluminum. It used a jackshaft (outside of the block) for oil pump and distributor drive. The jackshaft was driven by the fiberglass reinforced timing belt.[5] It was offered with a single one barrel carburetor, rated at Script error: No such module "convert"..[5] A W53 Sprint version for the Firebird produced up to Script error: No such module "convert"..
Considered advanced by Detroit engineering standards at the time, the Pontiac OHC 6 followed the Jeep Tornado I6 as the second post-World War II domestic-developed and mass-produced overhead cam automobile engine.[6]
The Pontiac's single camshaft was supported by journals within the aluminum valve cover; no separate bearing shells were used. The cam was driven by a noise-reducing fiberglass-reinforced cogged rubber belt instead of the usual metal chain or gears. Valves were opened with finger followers (centered under the cam) that pivoted at one end on stationary hydraulic adjusters. The oil pump, distributor, and fuel pump were driven by an external jackshaft powered by a rubber timing belt nestled within an aluminum housing bolted to the right side of the block. The head had a single port face with both exhaust and intake valves on the left side and valve stems strongly tilted towards the left. This engine was used in the 1966-67 Tempest and Le Mans and 1967 Firebird.
An optional high-performance Sprint version featured high-compression pistons, hotter cam, dual valve springs, split/dual exhaust manifold, stronger coil, and the then new Rochester Quadrajet carburetor. rated at Script error: No such module "convert"..[5] Power was increased to Script error: No such module "convert". in 1967.
Like other Pontiac engines of the era, the OHC 6 was not available in Canada with the exception of the Sprint version of the Firebird. Canadian-market Pontiac automobiles were equipped with the Chevrolet OHV six.
250
The OHC Script error: No such module "convert". was enlarged to Script error: No such module "convert". for 1968 to 1969. The base engine produced Script error: No such module "convert". while the 4 bbl Quadrajet Sprint versions were rated up to Script error: No such module "convert". with automatic transmissions. The versions with a manual transmission received a hotter camshaft that boosted ratings to Script error: No such module "convert"..
See also
References
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- ↑ Script error: No such module "Citation/CS1".
- ↑ a b http://www.ConceptScript error: No such module "Unsubst". Carz.com/vehicleScript error: No such module "Unsubst".
- ↑ a b c d e f g h i j k l m n o p q r Motor's Auto Repair Manual, Sixteenth Edition, Motor ,1953
- ↑ a b Motor's Auto Repair Manual, Motor,1963
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
Script error: No such module "Check for unknown parameters".
External links
- [1] Pontiac Overhead Cam SIX Forum