2026 IndyCar Engine Specs Deep Dive: Hybrid V6 Tech

The cars at the 2026 Indianapolis 500 will hit speeds approaching 240 mph on a straightaway. They'll do it with a 2.2-liter engine, six cylinders, and a hybrid system that didn't exist in IndyCar three years ago. They'll also do it with a chassis that has been on track since 2018, the same one for every team in the field.

This is the engineering reality of the 110th Running of the Indianapolis 500 on Sunday, May 24. Here's the deep dive on what's actually under the bodywork of every car on the grid.

2026 IndyCar Engine Specs: The 2.2-Liter Twin-Turbo V6

Every car in the 2026 IndyCar Series runs the same engine architecture: a 2.2-liter, twin-turbocharged V6 supplied by either Honda or Chevrolet. The two manufacturers have split the grid for years, with Honda powering Andretti Global, Chip Ganassi Racing, Meyer Shank, Rahal Letterman Lanigan, and Dale Coyne for 2026. Chevrolet supplies Team Penske, Arrow McLaren, Ed Carpenter Racing, A.J. Foyt Racing, and Juncos Hollinger Racing.

The engines themselves are tightly regulated. Cylinder bore is capped at 95mm. Stroke is unrestricted. Maximum RPM is 12,000, with a 12,200 RPM overtake limit. They use direct fuel injection, two Borg-Warner turbochargers per engine, drive-by-wire throttle, and a series-spec McLaren Electronics Engine Control Unit. Each engine weighs about 248 pounds, less than half of what most production V6s weigh.

Horsepower output varies based on track type and is controlled by IndyCar through turbocharger boost levels. At the Indianapolis Motor Speedway and other superspeedways, boost is set at 1.3 bar (about 19 psi), producing roughly 575 horsepower from the base engine. On 1.5-mile ovals like Texas, boost climbs to 1.4 bar for 625 hp. On road and street courses, boost goes higher (1.5 to 1.6 bar) for 675 hp. Push-to-pass on road courses kicks the boost to 1.65 bar.

Those base numbers are before hybrid power gets added.

How the IndyCar Hybrid System Works

IndyCar introduced its hybrid powertrain at Mid-Ohio in July 2024. The 110th Indy 500 will be the second running of the race with hybrids on the grid. The first was 2025, where Alex Palou became the first hybrid-era winner.

The hybrid system pairs the existing 2.2-liter V6 with an Energy Recovery System (ERS) and Energy Storage System (ESS). It captures energy under braking and stores it in a small battery pack mounted in the bellhousing between the engine and gearbox. The driver can deploy that stored energy on demand for an additional 60 horsepower.

The whole hybrid unit is shared technology between Honda and Chevrolet. Both manufacturers contributed to the design, and the same hardware sits in every car regardless of engine badge.

For the 110th Running, the combination of base engine plus hybrid produces around 700 to 750 horsepower at peak deployment. Add push-to-pass on road courses (Indy 500 doesn't allow it, since speeds are already high enough), and a driver can briefly call on more than 800 hp.

The strategy element this introduces is what makes the hybrid era different. Drivers manage their hybrid energy across the race the way they manage tires and fuel. Save it for the right moment. Spend it on the wrong corner, and you're racing at base power for the next ten laps. Watch any 2026 IndyCar broadcast and you'll see a deployment meter graphic on screen showing exactly how much hybrid energy each driver has banked.

For the racing terms you'll hear announcers use during the broadcast, our Indy 500 racing lingo guide breaks down ERS, push-to-pass, and the rest of the vocabulary.

The Dallara IR-18: IndyCar’s Universal Spec Chassis

Every team on the IndyCar grid runs the same chassis: the Dallara IR-18, built by Italian race-car constructor Dallara. The car has been the universal IndyCar platform since 2018.

The IR-18 is built around a carbon fiber and aluminum composite survival cell with the engine bolted in as a stressed member. The whole car weighs around 1,775 pounds without driver and fuel. Spec chassis racing means the cars are functionally identical out of the box. What separates the field is engineering, setup, driver skill, and strategy, rather than the budget required to build a unique chassis.

For 2026, all cars at the Indy 500 will run with new tire-ramp flaps, similar to the roof flaps NASCAR introduced years ago. They deploy automatically if the car spins backwards, designed to keep the car on the ground rather than flipping into the air. This is one of several ongoing safety updates to a chassis that was originally designed nearly a decade ago.

The Aeroscreen

The single most visible safety upgrade in modern IndyCar is the Aeroscreen, the polycarbonate windscreen surrounded by a titanium framework that wraps the cockpit. It debuted in 2020. Two events drove the need for it: Justin Wilson's death from debris at Pocono in 2015 and Robert Wickens's catastrophic Pocono crash in 2018.

The Aeroscreen is engineered to withstand a debris strike at 220 mph and adds about 50 pounds to the car. Drivers gave it mixed reviews when it first arrived because the older car wasn't originally designed around the additional weight at the front. Six years in, it's now a baseline part of the platform.

Fuel and tires

IndyCar has run on a 100% ethanol-based fuel developed by Shell since 2023. The series previously used an E85 blend (85% ethanol, 15% gasoline). The current fuel is sourced from American corn farmers and produced domestically.

Tires are spec Firestone Firehawks. Firestone has been the series tire supplier since 2000 and is signed through at least 2030. For 2026, IndyCar updated its street-course tire rules. Drivers now have to use one set of the primary compound and two sets of the alternate compound during a race, up from one of each in previous seasons. The change is meant to add a strategy layer to street races without affecting ovals.

For deeper history on how today's IndyCar got here from the 1911 Marmon Wasp at 74 mph, our Indy 500 history piece traces the engineering arc from then to now.

IndyCar 2028: Next-Gen Chassis (IR-28) and 2.4L Engine

The current platform is on borrowed time. IndyCar has confirmed a new chassis and a new engine arriving for the 2028 season.

The new chassis is the Dallara IR-28. It's projected to be 85 to 100 pounds lighter than the IR-18 and built from the start to integrate the hybrid system, the Aeroscreen, and modern aero. Early-phase testing is scheduled for 2026, with full implementation across the grid in 2028.

The new engine moves up to 2.4 liters with twin turbos and a redesigned hybrid unit that delivers more horsepower, more torque, and longer deployment windows. Honda's 2.4-liter V6 will be developed and built in the U.S. by Honda Racing Corporation USA. Chevrolet has signed on for the same architecture. Both manufacturers will also receive their own single-car factory team charter as part of the agreement, meaning each will field a full-season factory entry of its own.

This is the biggest engineering shift IndyCar has made since the IR-12 came out in 2012.

What to watch for at the 110th Indy 500

A few specific things make great viewing for anyone watching with this tech context in mind.

Watch the deployment meter on the broadcast graphic. It tells you when drivers are spending hybrid energy and when they're saving it. Smart drivers bank energy for restarts and the closing laps.

Listen to the engine note during deployment. There's a subtle change when the hybrid kicks in, especially audible on in-car cameras and pit lane stops.

Watch the tire-ramp flaps. If a car spins, the flaps are designed to deploy automatically. Whether they actually keep cars from flying is something every fan and engineer is watching for in real-world incidents.

Watch fuel strategy. The engines are smaller and lighter than NASCAR's V8s but more thirsty per horsepower than people expect. Pit stop strategy is built around the math of how many laps a car can run on a single fuel load.

Closing

The cars on the grid at the 110th Indianapolis 500 are spec-chassis race cars with a shared hybrid system, common safety equipment, and engines from two of the most experienced manufacturers in motorsport. Every team starts from the same baseline. What separates them is engineering hours, driver feel, and strategy calls under pressure.

Thirty-three of these machines will line up at IMS on Sunday, May 24 for 200 laps and 500 miles. Subscribe to our newsletter for the rest of our 2026 Indy 500 coverage, including driver previews and our final-day predictions.