4.0 liters is 244.1 cubic inches (4,000 cc) by straight math. Makers round, so the engines sold as 4.0 L measure from 241.2 to 245.6 cubic inches.
The most common: 241.4 ci (Toyota 241 (GR V6)); 244.7 ci (Ford 245); 243.0 ci (Mercedes-Benz 243); 241.3 ci (Jeep 242 (AMC Straight-6)); 242.2 ci (Toyota 242 (UZ V8)); 241.3 ci (Nissan 241).
| Engine | Codes | Years | Bore × stroke | Cubic inches | cc | Cylinders |
|---|---|---|---|---|---|---|
| Dodge 241 | — | 1953–1954 | 3.438" × 3.250" | 241.3 | 3,954 | 8 |
| Studebaker 246 | — | 1954–1960 | 3.313" × 4.750" | 245.6 | 4,025 | 6 |
| Dodge 243 | — | 1978 | 3.622" × 3.937" | 243.4 | 3,988 | 6 (diesel) |
| Jeep 242 (AMC Straight-6) | AMC 242, 4.0L HO, 4.0L MPFI | 1987–2006 | 3.875" × 3.410" | 241.3 | 3,954 | 6 |
| Toyota 241 (GR V6) | 1GR-FE, 3F-E | 1988–2024 | 3.701" × 3.740" | 241.4 | 3,956 | 6 |
| Toyota 242 (UZ V8) | 1UZ-FE | 1990–2000 | 3.445" × 3.248" | 242.2 | 3,969 | 8 |
| Ford 245 | 4.0 SOHC | 1990–2011 | 3.953" × 3.323" | 244.7 | 4,009 | 6 |
| BMW 243 | M60B40 | 1993–1995 | 3.504" × 3.150" | 243.0 | 3,981 | 8 |
| Mazda 245 | — | 1994–2009 | 3.953" × 3.323" | 244.7 | 4,009 | 6 |
| Oldsmobile 244 (Aurora) | L47 | 1995–2003 | 3.425" × 3.307" | 243.8 | 3,995 | 8 |
| Volkswagen 244 | — | 2002–2004 | 3.307" × 3.551" | 244.0 | 3,999 | 8 |
| Nissan 241 | VQ40DE | 2005–2019 | 3.760" × 3.622" | 241.3 | 3,954 | 6 |
| Land Rover 245 | Cologne V6 | 2005–2007 | 3.950" × 3.320" | 244.1 | 4,000 | 6 |
| Dodge 241 | — | 2007–2011 | 3.780" × 3.583" | 241.2 | 3,952 | 6 |
| BMW 244 | S65B40 | 2008–2013 | 3.622" × 2.961" | 244.0 | 3,999 | 8 |
| Porsche 244 (Mezger) | Mezger 4.0, M97/74 | 2011 | 4.043" × 3.165" | 243.9 | 3,996 | 6 |
| Mercedes-Benz 243 | M177, M176 | 2015–2026 | 3.268" × 3.622" | 243.0 | 3,982 | 8 |
| Porsche 244 (9A1) | MA2.75, 9A1, MA1/76 | 2016–2026 | 4.016" × 3.209" | 243.8 | 3,996 | 6 |
| Porsche 244 (EA825) | — | 2019–2026 | 3.386" × 3.386" | 243.9 | 3,996 | 8 |
Cubic inches and cc are worked out from each engine's bore and stroke. Years are the model years of the factory cars on this site that list the engine.
Start with the engine code: on 1981-and-later cars and trucks it is a character of the VIN (the 8th on most American makes), and most blocks carry a code stamp. Each engine's page lists its codes and the cars it came in. See the VIN engine code lists by make.
244.1 cubic inches by straight conversion (1 liter = 61.024 cubic inches). Real 4.0 L engines measure 241.2 to 245.6 cubic inches; the table above lists each one.
4,000 cc by definition. The engines sold as 4.0 L range from 3,952 to 4,025 cc.
Makers name engines by rounded sizes. The real size comes from bore × bore × stroke × 0.7854 × cylinders, so two engines sold as the same size are often a few cubic inches apart.