What Kind of Engine Is in Cars?

Most cars use internal combustion engines powered by gasoline or diesel, while a fast-growing share use electric motors—either alone (battery-electric) or combined with an engine (hybrids and plug‑in hybrids); a smaller niche runs on hydrogen via fuel cells or modified combustion engines. In practice, automakers now sell a spectrum of powertrains tailored to cost, emissions targets, and driving needs, from efficient small turbocharged engines to long-range electric drivetrains.

The main kinds of car engines on the road

The following list outlines the primary engine (or motor) technologies you’ll encounter in passenger vehicles today, how they work, and what they’re best at.

Gasoline (spark‑ignition) internal combustion engines: The most common globally. They ignite a gasoline–air mixture with spark plugs. Modern variants use direct or port fuel injection, variable valve timing, and often turbocharging for better efficiency and power.

Diesel (compression‑ignition) engines: Burn diesel fuel by compressing air until it’s hot enough to ignite injected fuel. Known for strong low‑rpm torque and fuel economy, especially in larger vehicles and long‑distance driving, though subject to stricter emissions controls.

Hybrid electric vehicles (HEVs): Pair a gasoline engine with one or more electric motors and a small battery that charges via regenerative braking. They don’t plug in and excel in city traffic with high fuel economy.

Plug‑in hybrid electric vehicles (PHEVs): Similar to HEVs but with larger batteries you can charge from the grid. Offer an all‑electric driving range for daily commutes and an engine for longer trips.

Battery‑electric vehicles (BEVs): Use one or more electric motors powered solely by a high‑capacity battery. Deliver instant torque, quiet operation, and zero tailpipe emissions. Range and charging speed depend on battery size and charging infrastructure.

Fuel cell electric vehicles (FCEVs): Generate electricity onboard from hydrogen and oxygen, emitting only water vapor. Refill times are quick, but hydrogen fueling networks are limited to select regions.

Alternative‑fuel ICEs (CNG, LPG, ethanol, hydrogen ICE): Conventional engines adapted to run on compressed natural gas, liquefied petroleum gas, high‑ethanol blends, or even hydrogen. Often serve fleet or regional niches.

Rotary (Wankel) engines: Rare in mainstream cars today; compact and smooth but historically challenged by emissions and efficiency. Sometimes used as compact range extenders in niche plug‑in designs.

Taken together, these options reflect a transition era: internal combustion remains dominant in global car fleets, while electrified powertrains—hybrids, plug‑in hybrids, and fully electric—are growing as costs fall and policies tighten on emissions.

How engines are arranged and how they breathe

Common engine layouts

The layout of pistons and cylinders affects packaging, smoothness, and vehicle design. Here are the configurations you’ll most often see in passenger cars.

Inline (I‑3, I‑4, I‑5, I‑6): Cylinders in a straight line; I‑4 is the global workhorse. I‑3s improve efficiency in small cars; I‑6s are prized for smoothness in premium/performance models.

V engines (V‑6, V‑8, V‑10, V‑12): Two banks of cylinders in a “V” shape; compact for their cylinder count and common in trucks and high‑performance cars.

Flat/boxer (H‑4, H‑6): Horizontally opposed cylinders lower the center of gravity, aiding handling; used by a few brands and in some sports models.

W and VR variants: Specialized compact multi‑bank designs used in select high‑output or packaging‑constrained applications.

Automakers choose layouts to balance smoothness, cost, space, and brand character; for most buyers, the benefits show up as refinement and how much room a powertrain leaves for passengers and cargo.

Induction and combustion technologies

How engines move air and fuel—and manage combustion—drives performance, efficiency, and emissions.

Naturally aspirated: Air is drawn in without forced induction; valued for linear response and simplicity, more common in smaller or performance‑tuned engines.

Turbocharged: Exhaust‑driven turbines force more air into the engine, boosting power and allowing smaller “downsized” engines to replace larger ones.

Supercharged/twin‑charged: Belt‑driven compressors (sometimes paired with turbos) improve low‑rpm response; used in select performance and towing applications.

Valve control: DOHC/SOHC architectures with variable valve timing/lift optimize breathing across rpm ranges; some engines deactivate cylinders at light loads.

Combustion cycles: Beyond conventional Otto, variants like Atkinson/Miller trade peak power for efficiency (common in hybrids).

Fuel delivery: Port injection (fuel mixed before the intake valve) and direct injection (fuel sprayed into the cylinder) are often combined for power, efficiency, and cleaner valves.

These technologies let modern engines deliver strong performance with lower fuel use and emissions, especially when paired with efficient transmissions and hybridization.

Electric motors: the other “engine”

In electric and fuel‑cell cars, the motor is the prime mover. Its type affects efficiency, cost, and performance characteristics.

Permanent‑magnet synchronous motors (PMSM): High efficiency and power density; common in many BEVs and hybrids.

Induction (asynchronous) motors: Robust and magnet‑free; used alone or in combination for high‑power or rear‑drive applications.

Switched‑reluctance/advanced synchronous designs: Emerging options that reduce rare‑earth dependency and improve cost efficiency.

Regardless of type, electric motors deliver instant torque and fine control, enabling features like one‑pedal driving and sophisticated torque vectoring.

Efficiency, emissions, and market trends (2024–2025)

Globally, internal combustion engines still power most vehicles on the road, but electrification is accelerating. Battery‑electric and plug‑in hybrid shares vary by region—high in parts of Europe and China, lower but growing in North America—while traditional hybrids have surged as a near‑term, cost‑effective path to lower fuel use. Regulatory pressure on CO2 and local air pollution continues to push automakers toward smaller turbocharged engines, wider hybrid adoption, and expanded BEV lineups. At the same time, charging infrastructure growth and battery cost trends are shaping how quickly BEVs gain share across segments.

Choosing the right engine for your needs

Use the following guide to match engine type with typical driving patterns, costs, and practical constraints.

Mainly city driving, short trips: Hybrid or plug‑in hybrid (if you can charge) for excellent stop‑and‑go efficiency; BEV if home/work charging is available.

Long highway commutes or frequent road trips: Modern turbo gasoline or diesel (where available) for quick refueling; long‑range BEV if fast‑charging is accessible along routes.

Towing and hauling: Larger displacement turbocharged gasoline or diesel engines for sustained torque; some electric trucks also offer strong towing with planning for charging.

Lowest running costs and minimal maintenance: BEV, given fewer moving parts and lower per‑mile energy cost in many markets.

Limited charging access (apartment living, rural areas): Conventional gasoline or non‑plug‑in hybrid to hedge fuel economy without relying on chargers.

Your best choice balances total ownership cost, available fueling/charging infrastructure, local incentives, and how you actually drive week to week.

Summary

Cars today use a mix of engines: gasoline and diesel internal combustion remain widespread; hybrids and plug‑in hybrids blend engines with electric motors for efficiency; and fully electric models rely on battery‑powered motors, with hydrogen fuel cells serving niche regions. Layouts (inline, V, boxer), breathing (natural or forced induction), and advanced controls define how ICEs perform, while motor type and battery capability shape EV behavior. The right option depends on your driving patterns, infrastructure access, and budget as the market steadily transitions toward greater electrification.

Do cars have V8 engines?

Most V8 engines produced in the automotive industry produce good power despite their high production capability. A vehicle equipped with an eight-cylinder engine isn’t always the best one. Many cars use V8 engines.

What type of engine is used in cars?

Petrol and diesel engines are the most common in modern cars. However, alternative fuel engines are also becoming popular. The common car engine types depend on the fuel that powers the motor.

Which is better v4 or V6 engine?

A V6 is “better” than a four-cylinder engine for drivers prioritizing power, torque, and smoothness, especially for heavy loads or spirited driving, while a four-cylinder engine is generally “better” for fuel efficiency and cost, though modern turbocharging has made four-cylinder engines very powerful. The best choice depends on your specific needs and priorities, such as the type of vehicle, driving conditions, and budget.
Choose a V6 if you need:

More Power and Torque: Opens in new tabV6 engines typically offer higher horsepower and torque, providing faster acceleration and better responsiveness, especially when carrying heavy loads or in larger vehicles like SUVs and trucks.
Smoother and Quieter Driving: Opens in new tabThe inherent design of a V6 engine results in smoother operation and a more pleasant, less “agricultural” sound, making for a more comfortable and refined driving experience.
Better Towing and Hauling: Opens in new tabThe increased power and torque of a V6 make it better suited for towing heavy trailers or hauling significant cargo.
Less Strain on the Engine: Opens in new tabA V6 engine often operates at lower RPMs, meaning it isn’t working as hard as a smaller engine would for similar tasks, which can contribute to better longevity and reliability.

Choose a four-cylinder if you prioritize:

Fuel Economy: Opens in new tabFour-cylinder engines are generally more fuel-efficient, resulting in lower fuel costs compared to V6 engines.
Lower Purchase Cost: Opens in new tabVehicles with four-cylinder engines are often less expensive to buy than those with V6s.
Lighter Vehicles: Opens in new tabSmaller, compact cars are typically well-suited for four-cylinder engines, offering a good balance of performance and efficiency.
Modern Turbocharging: Opens in new tabAdvanced turbocharging technology has significantly boosted the output of many four-cylinder engines, allowing them to provide performance that rivals or even exceeds some naturally aspirated V6s in certain applications.

Considerations for Both:

Vehicle Type: Opens in new tabThe appropriate engine size often depends on the vehicle; a V6 is often necessary for the power required by larger trucks and SUVs, while smaller cars often suffice with a four-cylinder.
Modern Technology: Opens in new tabThe gap in performance between four-cylinder and V6 engines has narrowed significantly due to advancements like turbocharging and direct injection, so it’s important to look at specific models rather than generalizing based solely on the number of cylinders.

Which car has a V12 engine?

Cars with V12 engines include current and recent models from luxury and exotic brands like the Ferrari 12Cilindri, Lamborghini Revuelto, Aston Martin Vanquish, Rolls-Royce Phantom, and Mercedes-Maybach S680. Older, iconic V12 cars also exist from brands like Cadillac, Packard, and Lincoln.
Examples of V12 Cars

Ferrari: The 12Cilindri, 812 Superfast, and Purosangue feature V12 engines.
Lamborghini: The Revuelto, a hybrid supercar, uses a V12 as its primary engine.
Aston Martin: Models like the Vanquish, DB11, and Vantage are known for their V12 engines.
Rolls-Royce: Luxury models such as the Phantom and Ghost use V12 powerplants.
Mercedes-Benz: The Maybach S680 and the older AMG S65 feature a twin-turbo V12.

Historical Context
V12 engines are most commonly found in high-performance and luxury vehicles. While less common today due to the rise of turbocharged V8s and hybrid powertrains, they are still a hallmark of certain brands, particularly in their flagship models.
Used V12 Cars

For those interested in more affordable V12 options, the used car market offers many models from the brands listed above.