Chrysler Hemi-6 Engine
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Refers to the Australian inline six cylinder Chrysler engines in 215, 245 and 265 cubic inch variants.
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[edit] History
Chrysler Corporation in the US had been working since 1966 on a straight-6 engine, called the D-engine, to replace the Slant 6 (G-engine) in Dodge trucks, but abandoned the effort. Chrysler Australia wanted a new six-cylinder engine for use in the Australian Chrysler Valiant, and so Chrysler USA sent engineers to work with Chrysler Australia's engineers to continue developing the D-engine. The first 245 in³ variant was released for the 1970 model year in the VG-model Valiant. It had partially hemispherical combustion chambers, but not true hemispherical ones; the "Hemi" moniker was used primarily for its marketing value based on the reputation of Chrysler's (true) Hemi V8s of the 1950s through early 1970s.
[edit] 215
The economical version of the Hemi 6, this engine shares the same stroke length as the other engines but has a smaller bore size of 3.52 inches and lower compression ratio of 8.0:1. It ran on standard fuel and produced 140 horsepower at 4400 rpm and 200 ft·lbf of torque at a low 1800 rpm.
All Hemi 6's shared the durable 7 main bearing crankshaft, the 215, although lower power, had the same reliability as other engines.
Cylinder Head Valve Sizes.
- Intake: 1.835"
- Exhaust: 1.500"
[edit] 245
The 245 in³ (4.0 liter) was the first of the Australian straight 6 engines. It was first used in the 1970 Chrysler Valiant, then in several later models.
All The Hemi 6 Engines had what was called a low hemispherical combustion chamber. The American v8 HEMI's combustion chamber was the shape of half the globe, while the hemi 6 cylinder's combustion chamber had approx 35% of the top of the globe, creating the low hemispherical shape. The Valve arrangement was side by side with a slight cant. The engine was non cross flow, meaning exhaust and intake manifolds are on the same side of the engine. Because this six cylinder engine had square shaped ports, low hemispherical combustion chambers, and large valves and being a Chrysler, the Chrysler corp of Australia thought it deserved the HEMI name, even though the design of the cylinder head only had a rough resemblance to the HEMI V8's of America. But one thing they had in common was being unmatched in their class for power and durability.
Basic Specifications.
- Bore Size: 3.76"
- Stroke: 3.68"
- Power: 165 horsepower @ 4600 rpm
- Torque: 235 ft·lbf @ 1800 rpm
- Low Hemispherical Combustion Chambers.
- 7 Main Bearing Crankshaft.
- Cylinder Head Valve Sizes.
- Intake: 1.845"
- Exhaust: 1.500"
[edit] 265
The 265ci(4.3L) was a newly cast engine, with a bigger cylinder bore size of 3.91 inches instead of the 245's 3.76 inches, and a new cylinder head, having slightly more hemispherical shaped combustion chambers, 1.96" intake valves and 1.60" exhaust valves.
The Standard Version of the 265 HEMI I6 had 203 hp @ 4600 rpm and 262ft·lbf of torque @ 2800 rpm.
The top of the line performance engine in the E49 Chargers had 302 hp @ 5600 rpm and 320ft·lbf @ 4400 rpm. The increased power is due mainly to large overlap camshaft, heavy duty valve springs, shot peened crankshaft and conrods, 3x 45 mm DCOE Weber sidedraught carburetors, tuned length headers and a higher compression ratio of 10.0:1.
Even though these motors are old, there are modern quests for more power. The already heavily modified E-49 265 HEMI I6 still has potential for even more power to be extracted by hot rodders, drag and track racers. Naturally aspirated versions are capable of making 400-430 horsepower and 360-390 ft·lbf of torque with the best modified version revving up to 7000-7600 rpm.
