A quick few seconds on google would have given you this:
Largest Car Engine
The greatest engine capacity of a production car is 13.5 liters (824 cu in), shared by the US Pierce-Arrow 6-66 Raceabout of 1912�18, the US Peerless 6-60 of 1912�14, and the Fageol of 1918.
If you are not just looking for cars then:
The Wartsila-Sulzer RTA96-C turbocharged two-stroke diesel engine is the most powerful and most efficient prime-mover in the world today. The Aioi Works of Japan's Diesel United, Ltd built the first engines and is where some of these pictures were taken.
It is available in 6 through 14 cylinder versions, all are inline engines. These engines were designed primarily for very large container ships. Ship owners like a single engine/single propeller design and the new generation of larger container ships needed a bigger engine to propel them.
The cylinder bore is just under 38" and the stroke is just over 98". Each cylinder displaces 111,143 cubic inches (1820 liters) and produces 7780 horsepower. Total displacement comes out to 1,556,002 cubic inches (25,480 liters) for the fourteen cylinder version.
So 13500cc for a car and 2548000cc as the biggest engine