Chrysler Australian engine

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Chrysler Corporation's Australian arm needed a six-cylinder engine for use in the Australian version of the Chrysler Valiant. Chrysler had been working on a straight-6 to replace the Slant 6 but abandoned the work. It was continued in Australia, and the Chrysler 245 I6 was born. It had hemispherical combustion chambers and was referred to as the Hemi in Australia.

245

The 245 in³ (4.0 liter) 245 was the first of the Australian straight 6 engines. It was first used in the 1970 Chrysler Valiant, then in several later models.

THE HEMI BADGE 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 what looks more like what would happen if you took approx 35% of the top of the globe, and that's how you get a low hemispherical shape. The Valve arrangement was side by side and had a slight cant to them and was non cross flow and not the same as the 392 and 426 Hemi V8's of America. Maybe 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"

215

The economical version of the Hemi 6's, sharing the same stroke length as the other hemi 6's but a smaller bore size of 3.52 inches and with 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, so although the 215 may have been behind in the power department it had all the reliability as the others.

Cylinder Head Valve Sizes.

Intake: 1.835"
Exhaust: 1.500"

265

The 265 was a newly cast engine, with a bigger cylinder bore size of 3.91 inches instead of the 245's 3.76 inches, with 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 E-49 Charger's had 302 hp @ 5600 rpm and 320ft·lbf @ 4400 rpm. Thanks to large overlap camshaft, heavy duty valve springs, shot peened crankshaft and conrods, 3 45 mm dcoe Weber sidedraught carburetors, tuned length headers and higher compression ratio of 10.0:1.

Even as old as the cars these motors are in there are a fair few fans playing with them in search for more power. As modified as the "E-49's" 265 HEMI I6 was, there is still potential for more power to be extracted by hot rodders, drag and track racers, with even naturally aspirated versions making 400-430 horsepower and 360-390 ft·lbf of torque with the best modified version revving up to 7000-7600 rpm.

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