Chevrolet 138ci 11.9:1 Specs
Chevrolet Chevrolet 138ci · 3.625" × 3.350" · 11.9:1 engine specs: 138 ci (2.3L), 4-cylinder, 3.625" bore x 3.35" stroke, 11.9:1 compression.
Dimensions
| Displacement | 138 ci / 2.3 L |
|---|
| Bore | 3.625" |
|---|
| Stroke | 3.35" |
|---|
| Cylinders | 4 |
|---|
| Configuration | I4 |
|---|
| Compression ratio | 11.9:1 |
|---|
| Rod length | 5.81" |
|---|
| Rod ratio | 1.734 |
|---|
| Bore/stroke ratio | 1.082 |
|---|
| Piston deck clearance | 0.037" |
|---|
Construction
| Block material | cast iron |
|---|
| Head material | cast iron |
|---|
| Valvetrain | OHV |
|---|
| Fuel type | gas |
|---|
| Advertised HP | 180 hp |
|---|
| Years | 1990–1991 |
|---|
What these numbers mean
| Bore/stroke character | 1.082 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|
| Mean piston speed at 6,000 RPM | 3,350 ft/min — conservative for a street engine |
|---|
| Rod ratio | 1.734 — moderate — the range most production V8s fall in |
|---|
| Displacement per cylinder | 34.5 ci |
|---|
| Static compression | 11.9:1 — high enough that pump premium or better is normally required |
|---|
Cylinder head
| Intake valve diameter | 1.442" |
|---|
| Exhaust valve diameter | 1.245" |
|---|
Run the numbers for this engine
Each link opens the calculator with this engine's specs already filled in.
Variants sharing these dimensions (2)
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|
| 1990 | 180 hp | — |
| 1991 | 180 hp | — |
Similar engines
Source: NHRA blueprints — nhra.net blueprints
← All Chevrolet 138ci engines