The Top 10 Largest American Engines

Big, brutish engines are less common as the new market shifts to the small-displacement turbocharged engine. Midsize sedans are not only downsizing their engines but supercars too. The Ferrari 458 Italia uses a 4.5-liter V-8 while the McLaren12C has a smaller 3.8-liter version. These are the top 10 largest engines that you can find in the U.S.

10. Lamborghini Anventador: 6.5-liter V-12, 691-hp, and 509 lb.ft


A Lamborghini Aventador with the smallest engine means you are in for a great time. The naturally aspirated V-12 engine in the Aventador produces 691 horsepower and 509 lb-ft torque with a displacement of 6.5 liters. This engine is the second-smallest and most powerful on this list. Aren’t things looking good already?

“high-rpm power seems overwhelming to say the least. Midrange torque seems almost insignificant until you realize that excess can be a good thing. The engine pulls hard, regardless of whether speeds are in the double or triple digits. The soundtrack, deep, operatic, and mechanized euphony, never gets tired. – executive editor Ron Kiino

9. Rolls-Royce Ghost/Wraith 6.6-liter, 563-624-hp, and 575-590 Lb-ft twin-turboV-12 (56592cc).


Although the Rolls-Royce Ghost sedan might sport the emblem of the storied British automaker’s, the twin-turbo V-12 powerplant beneath the hood of the Wraith coupe and RollsRoyce Ghost sedan may be BMW bred.

The Ghost’s V-12 engine is uncannily quiet and smooth, just like every other great Rolls-Royce engine. It’s also extremely powerful, producing 536 horsepower and 575 lb. ft. of torque at 1500 pm. This makes the Ghost a cruise missile that can sprint from 0-60 mph in 4.3 seconds. – editor-at-large Angus MacKenzie

8. Chevrolet Silverado HD/ GMC Sierra HD: 6.6-liter turbodiesel V-8 with 397 horsepower and 765 lb. ft torque (6599 ccs).

The U.S. is still able to produce a large V-8. Thanks to their 6.6-liter turbodiesel engines paired with Allison transmissions, the Chevy Silverado as well as GMC Sierra HD are both on this list. This combination is so great that we named the diesel-powered Silverado HD Truck of the Year in 2011.

The turbodiesel’s performance was significantly better than the old Silverados, despite the 109-pound weight gain. The 2011 Silverado 3500HD dually hit 60 mph in just 7.0 seconds. This is significantly faster than the 2011 gas 2500HD, which was lighter and blew the doors of the Silverado HD. Associate editor/Truck Trend editor Allyson Hartwood: The quarter was completed in 15.4 seconds at an elevation of 87.9 meters.

7. Ford F Series Super Duty: 6.7-liter, 400-hp, 800 lb. ft turbodiesel V-8 (66551 ccs).


Although the Ford Super Duty’s Powerstroke Turbodiesel V-8 isn’t the biggest of heavy-duty pickups it doesn’t have the most horsepower. However, its eight cylinders produce more power than any of its Detroit counterparts and also generate a jaw-dropping 800 lb. ft of torque.

The engine layout was designed to reduce noise and vibration. This engine is extremely quiet, as it has been the industry trend over the past couple of years. It’s also more powerful than ever, making the Super Duty pull away at traffic lights like a hot rod. Allyson Harwood, associate editor/Truck Trend Editor

6. Ram HD: 6.7-liter, 350-385 horsepower, and 660-850lb-ft turbodiesel I-6 (6690cc).


Torque is the king in full-size heavy-duty trucks. The RamHD lineup offers more torque than any other truck, with 850 lb-ft of twist. This is not why Ram was included on this list. The Ram’s Cummins-sourced, 6.7-liter turbodiesel engine makes it the sixth-largest available in the U.S., and its straight-six configuration gives the Ram the lowest cylinder count and second-best torque.

Ram has improved its 2012 offering with the Laramie Longhorn trim and a high-output engine package. This package delivers torque of 800 lb-ft, and an uprated torque converter. These facts and figures sound impressive but do they make Ram a true barnstormer on the road? Our standard performance testing revealed a clear ‘no’. Rory Jurnecka, associate editor

5. Bentley Mulsanne – 6.7-liter, 505 horsepower, and 752 lb. ft twin-turbo V-8 (67227cc).


Although Bentley Mulsanne owners might view it as made of British steel, the luxury flagship sedan was designed by Germans. The Mulsanne’s 6.7-liter twin-turbo V-8 engine is still the fifth-largest in America. However, Bentley will try to sell it as a 6.75-liter unit.

“[The Mulsanne’s] 6.75-liter twin-turbo V-8 produces 752 horsepower at 1500 pm. Except for a few heavy-duty types of diesel that offer more torque, the only production car with more torque is the 16-cylinder quad-turbo Veyron…In actuality, the Mulsanne has so much low-down torque, Scott Mortara, our road editor, insists that it is a diesel. The torque-monster engine produces 505 horsepower. Bentley’s latest engine is as powerful as a redwood caught up in a flash flood. It’s impossible to stop it. – senior features editor Jonny Lieberman

4. Rolls-Royce Phantom: 6.7-liter V-12, 453-hp, and 531 lb-ft (6789cc).


Rolls-Royce used to refuse to publish engine specifications. Instead, they simply called power output “adequate”. This description is most definitely true for the Phantom’s massive 6.7-liter V-12 with 453 horsepower.

“I felt like a chauffeur every time I was behind the wheel. This, I think, is the whole point. If solitude is your goal, Phantom Saloon is for you. Driving-wise, there isn’t much to be different between the new and old one. The 6.75-liter V-12, which is direct-injected, remains unchanged. The power output is still adequate. Rolls has not mentioned power output once. – senior features editor Jonny Lieberman

3. Chevrolet Corvette Z06/427/Camaro Z/28 – 7.0-liter 505 horsepower and 470 lb. ft V-8


It would be an understatement to say that the LS7 engine in the Corvette Z06, 427, and upcoming Camaro Z/28 is our favorite engine. The big, pushrod V-8 is 7.0 liters in displacement and produces 505 horsepower and 470 lb-ft torque without the need for turbo- or superchargers. The LS7 engine is a magnificent one, offering power all the time, and the most powerful V-8 bellows.

The 427 is every bit as terrifying as the Z06. The LS7’s raw power seems inexhaustible. Running up to its 7000 rpm is asking for a visit from Johnny Law. The valves in the mufflers won’t open until you are over 3000 rpm. If you stand on them, you will only hear the engine note for a split second before you reach felony territory. – associate editor from

2. Bugatti Veyron 16.4 Grand Sport Vitesse – 8.0-liter, 1200-hp, and 1106 lb.ft quad-turbo W-16


Look at this — the Bugatti Veyron is not on the top 10. Although the quad-turbo W-16’s W-16 has the most turbos, cylinders, and horsepowers, the 1200-hp engine with its massive 1200-hp power is only 0.4 liters away from earning the top spot. Bugatti’s top speed of more than 250 mph is not a concern.

“Once the car is underway, the massive pull never stops. Although I’ve seen powerful cars lose both their breath and their gears or get trapped in drag, I didn’t feel any weakness in the SuperSport. The Bugatti feels unstoppable and limitless at speeds where it starts to lose momentum from other supercars. There are very few roads on the planet that mortals can drive to even begin to test this (or any) Veyron’s potential. – editor-in-chief Edward Loh

1. SRT Viper: 8.4-liter V-10, 640-hp, 600 lb-ft


An American supercar is an engine with the largest available U.S. engine — and everything remains the same around the globe. The Viper’s 8.4-liter V-10 produces 640 horsepower and 600 lb. ft of torque. The combination is sufficient to enable the Viper TA track-ready car to race at Mazda Laguna Seca’s top speed. It also makes the Viper the fastest production car on the storied racetrack.

“The Viper still boasts an 8.4-liter V-10 that produces 640 horses and 600 lb-ft of torque. However, this latter is only available at 5000 pm, which is when all hell breaks loose. ” – senior features editor Jonny Lieberman

Bill Rose

I love writing about health and lifestyle as it's my job to protect people from harmful things!

Back to top