A "345 engine" primarily refers to an automobile engine with a displacement of 345 cubic inches (CI). This designation is most famously associated with the 5.7-liter (L) Hemi V8 engine, where the number "345" signifies its volumetric displacement.
Understanding Engine Displacement
Engine displacement is the total volume swept by all the pistons in an engine's cylinders. It's a key indicator of an engine's size and potential power output. It can be measured in liters (L) or cubic inches (CI).
- Cubic Inches (CI): This measurement calculates the volume by considering the bore (diameter of the cylinder) and stroke (distance the piston travels) for each cylinder, then summing them up for all cylinders.
- Liters (L): This is the metric equivalent, commonly used worldwide for engine sizing.
For the 5.7L Hemi V8, its specific design, including the bore and stroke measurements, results in a displacement of approximately 345 cubic inches. The 5.7L Hemi engine features a bore of 3.917 inches and a stroke of 3.578 inches. When these dimensions are used to calculate the volume swept by its eight cylinders, the total displacement comes out to roughly 345 cubic inches.
The Significance of the "345 Hemi" Badge
Many vehicles equipped with the 5.7L Hemi engine proudly display a "345 Hemi" badge. This badging directly references the engine's cubic inch displacement, serving as a clear indicator of the powerful V8 engine under the hood. It’s a way for manufacturers and enthusiasts to highlight the specific size and performance characteristics of this popular engine.
| Engine Designation | Metric Displacement (Liters) | Imperial Displacement (Cubic Inches) |
|---|---|---|
| 345 Hemi | 5.7 | 345 |
Key Takeaways
- The term "345 engine" directly relates to the engine's displacement in cubic inches.
- It is most commonly used to describe the 5.7-liter Hemi V8 engine.
- The "345 Hemi" badge on vehicles signifies the presence of this specific powerful engine.
