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Chrysler 512ci (2011) · 450 hp specs: 512 ci (8.4L) 10-cylinder, 4.055 x 3.96 in (103 x 100.6 mm) bore and stroke, 12.5:1 compression. Rated 450 hp, 2011.
The Chrysler 512ci (2011) · 450 hp is close to square: 4.055" bore against 3.96" stroke, within 2.4%, which splits the difference between a high-revving layout and a torque layout. The 3.96" stroke puts mean piston speed at 4,000 ft/min around 6,050 RPM, which is where a production bottom end is generally considered at its limit. A rod ratio of 1.58 is in the range most production engines fall in. Each of the 10 cylinders displaces 51.2 ci (839 cc).
12.5:1 on iron heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
| Displacement | 512 ci / 8.4 L |
|---|---|
| Bore | 4.055" |
| Stroke | 3.96" |
| Cylinders | 10 |
| Configuration | V10 |
| Compression ratio | 12.5:1 |
| Rod length | 6.255" |
| Rod ratio | 1.58 |
| Bore/stroke ratio | 1.024 |
| Piston deck clearance | 0" |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 450 hp |
| Years | 2011 |
| Bore/stroke character | 1.024 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,960 ft/min — in the range typical of performance street engines |
| Rod ratio | 1.58 — moderate — the range most production V8s fall in |
| Displacement per cylinder | 51.2 ci |
| Static compression | 12.5:1 — high enough that pump premium or better is normally required |
| Intake valve diameter | 2.085" |
|---|---|
| Exhaust valve diameter | 1.615" |
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