The Chrysler 318 engine was a popular V8 engine used in a variety of vehicles, including trucks and cars. While both the truck and car versions of the 318 engine shared many similarities, there were also some key differences between the two.
Bore and Stroke
The bore and stroke of the 318 truck engine were different from the bore and stroke of the 318 car engine. The truck engine had a bore of 3.91 inches and a stroke of 3.31 inches, while the car engine had a bore of 3.91 inches and a stroke of 3.00 inches. This difference in bore and stroke resulted in the truck engine having a larger displacement than the car engine (318 cubic inches vs. 305 cubic inches).
Compression Ratio
The compression ratio of the 318 truck engine was also different from the compression ratio of the 318 car engine. The truck engine had a compression ratio of 8.5:1, while the car engine had a compression ratio of 9.0:1. This difference in compression ratio meant that the truck engine could run on lower-octane fuel than the car engine.
Cam Shaft
The camshaft in the 318 truck engine was different from the camshaft in the 318 car engine. The truck engine had a camshaft with a lower lift and duration than the car engine, which resulted in the truck engine producing less torque than the car engine.
Horsepower and Torque
The horsepower and torque ratings of the 318 truck engine were different from the horsepower and torque ratings of the 318 car engine. The truck engine produced 150 horsepower at 4,000 RPM and 235 pound-feet of torque at 2,000 RPM, while the car engine produced 175 horsepower at 4,000 RPM and 255 pound-feet of torque at 2,400 RPM.
Other Differences
In addition to the differences listed above, the 318 truck engine and the 318 car engine also had different oil pans, intake manifolds, and exhaust manifolds.
Conclusion
The Chrysler 318 engine was a versatile engine that was used in a variety of vehicles. While the truck and car versions of the 318 engine shared many similarities, there were also some key differences between the two. These differences were due to the different intended uses of the two engines. The truck engine was designed for durability and fuel economy, while the car engine was designed for performance.
