Units of Measure
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In the United States, the cubic inch was the commonly used unit of measurement until the 1980s by the manufacturers to express the displacement of engines for cars, trucks, etc. (e.g., the "426" in 426 HEMI refers to 426 cubic inches displaced). It is still used for this purpose in the context of the classic-car hobby, auto racing, and so forth.
The automotive industry nowadays uses the International System of Units / le Système international d'unités (SI), a modern metric system for this purpose worldwide (e.g. 6.1 litre HEMI). However, in markets accustomed to cubic inches, the actual displacement measurements of an engine are still given by many manufacturers in these units, usually along with metric value; e.g. the 6.1-litre HEMI's published displacement is 370.0 CID/6,059 cc. Some examples of common CID-to-litre conversions are given below. Note that nominal sizes are not always precisely equal to actual sizes. This principle is frequently seen in engineering, tool standardization, etc. (for ease of use) and in marketing (when a big round number sounds more impressive, is more memorable, etc.).
| make (± division) | cubic inch displacement (CID) - (actual) (nearest 1) |
cubic inch displacement (CID) - (nominal) |
International System of Units (SI) - (actual) (nearest 0.01) |
International System of Units (SI) - (nominal) |
|---|---|---|---|---|
| Honda, Kawasaki, others | something close to 61 CID | N/A (not marketed in CID) | 1000 cc (= 1.0 litre) | |
| Honda, Kawasaki, others | something close to 98 CID | N/A (not marketed in CID) | 1600 cc (= 1.6-litre) | |
| Honda, Kawasaki, others; Ford | something close to 122 CID | N/A (not marketed in CID) | 2000 cc (= 2.0-litre) | |
| GM (Pontiac, Buick, Oldsmobile, GMC, others) | 151 CID | N/A (not marketed in CID) | 2.5-litre | |
| Toyota, Ford, Chrysler, others | something close to 183 CID | N/A (not marketed in CID) | 3.0-litre | |
| AMC, Jeep, Chrysler (I6) | 241.573 CID | 242 CID | 3,959 cc | 4.0-litre |
| Ford | something close to 244 CID | N/A (not marketed in CID) | 4.0-litre | |
| Ford (Ford, Mercury), GM (Chevrolet, GMC) | 250 CID | 4.10-litre | 4.1-litre | |
| AMC, Jeep, International Harvester | 258 CID | 4.22-litre | 4.2-litre | |
| GM (Chevrolet, GMC, Oldsmobile) | 262 CID | 4.33-litre | 4.3-litre | |
| Ford (Ford, Mercury) | 289 CID | 4.74-litre | N/A (not marketed in SI) | |
| Ford (Ford trucks and vans) | 300 CID | 4.92-litre | 4.9-litre | |
| GM (Pontiac) | 301 CID | 4.9-litre | N/A (not marketed in SI) | |
| Ford, GM (Chevrolet) | 302 CID (302 Windsor, 302 Cleveland, Chevrolet 302) | 4.95-litre | 5.0-litre | |
| GM (Oldsmobile) | 303 CID | |||
| AMC, Jeep, International Harvester | 304 CID | 4.98-litre | 5.0-litre | |
| GM (Chevrolet, Pontiac, Oldsmobile, Buick) | 305 CID | 5.0-litre | N/A (not marketed in S/I) | |
| GM (Chevrolet; Buick) | 307 CID | 307 CID | 5.03-litre | N/A (not marketed in SI) |
| GM (Oldsmobile) | 307 CID | N/A (not marketed in CID) | 5.03-litre | 5.0-litre |
| Chrysler (Chrysler, Dodge, Plymouth) | 318 CID | 5.21-litre | 5.2-litre | |
| AMC, GM (Chevrolet) | 327 CID | 327 CID | 5.36-litre | N/A (not marketed in SI) |
| GM (Oldsmobile) | 330 CID | |||
| Buick, Chrysler (Chrysler, Dodge, Plymouth) | 340 CID | 5.57-litre | N/A (not marketed in SI) | |
| GM (GMC, Chevrolet, Buick, Oldsmobile, Pontiac, others) | 350 CID | 5.74-litre | 5.7-litre | |
| Ford (Ford, Mercury) | 351 CID (Cleveland or Windsor) | 5.75-litre | 5.8-litre | |
| AMC, Chrysler (Chrysler, Dodge, Plymouth) | 360 CID | 5.90-litre | 5.9-litre | |
| Chrysler (Chrysler, Dodge, Plymouth) | 383 CID | 6.28-litre | N/A (not marketed in SI) | |
| GM (Pontiac) | 389 CID | 6.5-litre | N/A (not marketed in SI) | |
| AMC, Ford, GM (Cadillac) | 390 CID | 6.39-litre | N/A (not marketed in SI) | |
| GM (Oldsmobile) | 394 CID | |||
| GM (Chevrolet) | 396 CID | 6.49-litre | N/A (not marketed in SI) | |
| GM (Chevrolet, Pontiac, Oldsmobile) | 400 CID | 6.55-litre | N/A (not marketed in SI) | |
| GM (Buick) | 401 CID | |||
| GM (Chevrolet) | 409 CID | 6.70-litre | N/A (not marketed in SI) | |
| GM (Pontiac) | 421 CID | 6.90-litre | N/A (not marketed in SI) | |
| GM (Oldsmobile) | 425 CID | |||
| Chrysler (Chrysler, Dodge, Plymouth) | 426 CID (Wedge or Hemi) | 6.98-litre | 7.0-litre | |
| Ford (Ford, Mercury) | 427 CID | 7.00-litre | 7.0-litre | |
| GM (Pontiac),Ford (Ford, Mercury) | 428 CID | 7.01-litre | 7.0-litre | |
| Ford (Ford, Mercury) | 429 CID | 7.03-litre | 7.0-litre | |
| Chrysler (Chrysler, Dodge, Plymouth) | 440 CID | 7.21-litre | 7.2-litre | |
| GM (GMC, Chevrolet) | 454 CID | 7.44-litre | 7.4-litre | |
| GM (Buick, Oldsmobile, Pontiac) | 455 CID | 7.46-litre | N/A (not marketed in SI) | |
| Ford (Ford ; Lincoln ) | 460 CID | 7.54-litre | 7.5-litre | |
| GM (Cadillac) | 472 CID | 7.73-litre | 7.7-litre | |
| GM (Cadillac) | 500 CID | 8.19-litre | 8.2-litre | |
| Chrysler (Dodge) | 506.5 CID | 505 CID | 8285 cc | 8.3-litre |
| Chrysler (Dodge) | 509.8 CID | 510 CID | 8354 cc | 8.4-litre |
| GM (GM Performance Parts) | 572 CID | 9373 cc | 9.4-litre |
Read more about this topic: Engine Displacement
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