Ilmor Engineering originally designed built and produced IndyCar engines for Chevrolet. In the 1990s, the company built a partnership with Mercedes-Benz to power F1 cars for both the Sauber and McLaren teams. After the death of Paul Morgan in a vintage aeroplane crash in 2001, Mercedes increased its stake until it owned the entire company, and renamed it Mercedes-Benz High Performance Engines Ltd. In 2005, Mario Illien concluded a deal to purchase the Special Projects part of the company in partnership with Roger Penske, which worked in partnership with Honda Performance Development for IndyCar engines between 2003 and 2011.[1] This new company, which is independent of Mercedes, is once again known as Ilmor Engineering Ltd. They developed the Ilmor X3 for the 2007 MotoGP World Motorcycle Championship, entering one race before withdrawing and effectively shutting down the race team, due to funding problems.
Racing remains the core part of the business today and Ilmor acts as a consultant for motorsport clients from all forms of racing. However, the business is now using its racing expertise to diversify into other areas such as OEM automotive, defence, marine and energy efficient engine applications.
Both engineers were working at Cosworth on the Cosworth DFX turbocharged methanol engine for the CART Indy Car World Series; differences of opinion over the direction in which DFX development should go (Cosworth were inherently conservative as they had a near monopoly) led them to break away from their parent company to pursue their own ideas. There was some acrimony in their split from Cosworth, their former employer claiming that the Ilmor engine was little different from their planned modifications to the DFX.[5]
Founded as an independent British engine manufacturer in 1983, it started building engines for Indy cars with the money of team owner and chassis manufacturer Roger Penske. The Ilmor 265-A, badged initially as the Ilmor-Chevrolet Indy V-8, debuted at the 1986 Indianapolis 500 with Team Penske driver Al Unser. In 1987, the engine program expanded to all three Penske team drivers (Rick Mears, Danny Sullivan, and Al Unser), Patrick Racing, and Newman/Haas Racing. Mario Andretti, driving for Newman/Haas, won at Long Beach, the engine's first Indy car victory. He also won the pole position for the 1987 Indianapolis 500. Rick Mears earned the first victory for the engine in a 500 mile race at the 1987 Pocono 500. A year later, Mears won the 1988 Indianapolis 500, the engine's first win at Indianapolis. The engine went on to have a stellar record in CART. From 1987 to 1991, the "Chevy-A" engine won 64 of 78 races.
In 1992, the 265-A engine was followed up by the 265-B engine. The "Chevy-B" was fielded singly by Penske Racing (Rick Mears and Emerson Fittipaldi) in 1992 and won four CART series races. All other Ilmor teams remained with the venerable "Chevy-A" for 1992. Bobby Rahal, driving a "Chevy-A" won the 1992 CART championship, the fifth consecutive (and final) for the 265-A. Al Unser Jr. won the 1992 Indianapolis 500 driving a "Chevy-A", also the fifth consecutive (and final) Indy 500 win for the 265-A. Emerson Fittipaldi drove a "Chevy-B" to 4th place in points, but both he and Mears dropped out of that year's Indy 500 due to crashes. It was at this time that Ilmor was receiving new competition from Cosworth, which had just introduced their new powerplant, the Ford-Cosworth XB.
For the 1993 season, the 265-C engine was introduced, intended to replace both the 265-A and the 265-B. The "Chevy-C" was used widespread, and produced continued success for Ilmor. Some backmarker teams continued to utilize the "A" and "B" engines during the 1993 season, but neither the "A" nor the "B" would win another Indy car race. Chevrolet dropped its badging support after the 1993 season.
For the 1994 season, two new engines were introduced. The 265-D engine replaced the 265-C, although some of the smaller teams still ran the "C" throughout 1994. Without badging support, the engines were referred to simply as the "Ilmor-C" and the "Ilmor-D". The other engine introduced in 1994 was the top-secret 265-E (see below), which was actually a 3.43 liter pushrod engine, used by Penske Racing at the 1994 Indianapolis 500.
For 1995, Mercedes-Benz became the badging manufacturer for the Ilmor Indy car engines. The engine continued to be a strong contender on the CART circuit. In 1996, the open wheel "split" began between CART and the IRL. Ilmor primarily was a provider for CART-based teams, and did not provide engines for any full-time IRL teams. At the 1996 Indy 500, the "Ilmor Mercedes-Benz D" was used by Galles Racing, and finished second, the powerplant's one and only start in an IRL-sanctioned race. When the IRL switched to normally-aspirated engines for 1997, the 265s were no longer permitted in the IRL and the Indy 500, and from that point on raced in the CART series exclusively.
F1 debut
In 1991 Ilmor entered Formula 1 with a V10 engine as exclusive supplier to the ambitious Leyton House team (formerly March). After some troubles Leyton House returned to racing as March in 1992, still using Ilmor engines. Ilmor also supplied engines to the Tyrrell team, starting from 1992. Powered by the Ilmor V10, Tyrrell scored eight points through Andrea de Cesaris and March another three through Karl Wendlinger.
Sauber
Ilmor were gaining a reasonable reputation in F1,[citation needed] and so the Sauber sportscar team and Mercedes-Benz, who were planning their Formula One entry together, signed a deal with Ilmor after scrapping plans for a Mercedes engine. In order to protect their image, Mercedes took on an observational role in the project and the cars had "Concept by Mercedes-Benz" written in the engine cover.
After scoring 12 points in 1993, Mercedes entered officially in 1994 using an updated version of the 1993 engine, and now "Powered by Mercedes-Benz" was seen on the Sauber engine-cover. The same year Mercedes-Benz acquired Chevrolet's 25% share of Ilmor.
In 1994 Ilmor also supplied the new Pacific GP team of Keith Wiggins with the old 1993 spec customer engines. In 32 attempts, the Pacific cars qualified seven times. After Pacific GP Lotus lost its Ilmor customer supply deal to Ford Zetec in 1995, Ilmor decided to reposition its Formula One involvement.
Racing in the United States
The 265D V8s ran the entire 1994 Indy Car season badged as "Ilmor Indy V8", with Team Penske headlining the program, which included free engines.
In 1994, Ilmor produced the Mercedes-Benz 500I engine for Team Penske (although work on this started long before the Mercedes takeover as a private project between Ilmor and Penske). The 500I exploited a loophole in the engine rules at the Indianapolis 500 (which was run under slightly different rules to other CART races). Originally stock-block engines based on production units, fitted with two pushrod and rocker arm actuated valves per cylinder, were permitted to run at increased cubic capacity (3.43 litres vs 2.65 litres) and significantly greater turbo boost than the pure racing engines. For several years Buick V6 units had been extremely fast but fragile; the restrictions were relaxed with the intent of permitting Buick-like engines to use stronger but still production-like blocks – the Menard engine based on the Buick took this approach, as did the unsuccessful Greenfield V8.
Ilmor realized that this provided scope for a completely new pure-bred racing engine – it would need to retain pushrods, but could be designed specifically for the requirements of the Indianapolis 500, and in strict secrecy schemed a completely new V8 engine which was approximately 200bhp (150kW) more powerful than the Cosworth XB and Ilmor 265D opposition. Team Penske's cars were by far the fastest at the 1994 Indianapolis 500, and Al Unser Jr. won the race, with Emerson Fittipaldi also figuring strongly until an accident on lap 184. The loophole was closed for 1995, and Penske, a year behind on development for Indy, failed to qualify their 265D-powered cars for that year's 500.
For 1995 the 265D V8s were rebadged Mercedes and continued to be highly competitive, with Al Unser Jr. finishing runner-up with four wins. Rahal-Hogan Racing joined Penske as major teams, as Bobby Rahal collected five podiums to finish third in the overall standings. In 1996, Penske's Unser Jr. finished fourth, Rahal seventh and his teammate Bryan Herta eighth, with neither collecting wins. In 1997, Unser Jr. had a poor season, whereas Penske teammate Paul Tracy claimed three wins but retired in the last five races to finish fifth in the standings. PacWest drivers Maurício Gugelmin and Mark Blundell claimed four wins combined and finished fourth and sixth in the standings. Forsythe driver Greg Moore got two wins and three second places, but retired in eight races and finished seventh. After the CART-IRL split, Mercedes gradually lost interest in American racing and left CART after the 2000 season.
Ilmor continued working in the United States on the Oldsmobile Aurora V8 for the IRL Penske entries.[6]
In 2003 Honda partnered with Ilmor on the Honda Indy V8 engine between 2003 and 2011 for co-assembling, preparation, tune-up and maintenance.[7][8] At the conclusion of the 2011 season, Honda discontinued their partnership with Ilmor subsequently moving all design, development and production in house without any third-party tune-up partnership to HPD, for the 2012 Honda Indy V6.[9]
In 2012 Chevrolet returned to the IndyCar Series, partnering with Ilmor on the Chevrolet Indy V6 engine program and supplying free engines for Team Penske and rest of Chevrolet-powered IndyCar Series teams are customers by pay lease system.
Ilmor is the option specification engine supplier of engines for the ARCA Menards Series and NASCAR Camping World Truck Series. Truck Series teams are allowed to use the option crate engine based on the LSX, and many teams have switched to the option engine.[10] Ilmor was heavily criticized when four of its NT1 engines failed during the 2019 World of Westgate 200 at Las Vegas Motor Speedway, effectively eliminating ThorSport Racing drivers Grant Enfinger and Johnny Sauter from the playoffs. Matt Crafton also experienced an engine failure during the race, but survived the playoffs due to his points standings. The manufacturer took responsibility for the engines that suffered from severe detonation due to the combination of the high engine load condition combined with the extreme weather conditions in Las Vegas.[11] Despite Ilmor's announcement, NASCAR denied ThorSport's request to reinstate Enfinger and Sauter into the playoffs.[12]
Back in F1, for 1995 Mercedes had set its sights on higher goals and went looking for an engine supply deal with a more competitive team. Sauber had the opportunity to become a customer team, but team principal Peter Sauber opted to sign a deal with full-works Ford instead. From then on Ilmor built the Mercedes-Benz engines exclusively for McLaren after Ilmor repositioned its Formula One involvement from independent engine manufacturer to trusted engine builder and assembler to Mercedes-Benz High Performance Engines.
The Ilmor engines went on to be hugely successful with McLaren, scoring several podiums in both 1995 and 1996, leading to three wins in 1997 and back to back drivers championship in 1998 and 1999, as well as the constructor's championship in 1998. Although they did not win another championship until 2008 the Ilmor-Mercedes engines won several races.
Ilmor Engineering, Inc., a sister company to Ilmor U.K., was incorporated in 1990 (President – Paul Ray) with the primary goal of providing engineering support to customers using the Ilmor Ltd.-manufactured Chevrolet 265A Indy Car engine. In 1998, the headquarters moved from its original facility in Redford, Michigan, into a custom-built, 28,000-square-foot (2,600m2) facility in Plymouth, Michigan. The new facility housed all of the necessary disciplines to support the Indy Car program including design, engineering, engine building, engine test, performance development and trackside support functions.
From its start as an Indy Car engineering and trackside support group Ilmor, Inc.’s capabilities have grown to encompass design and analysis tools, engine and sub-systems test capabilities – including emissions compliance benches, precision manufacturing, electronics and wiring design and manufacture, and facilities for service and support.
Today, the expanded facility (over 44,000 square feet) houses more than 100 people, and produces high performance products in multiple powertrain related arenas including auto racing, boat racing, high-performance road cars, high performance offshore powerboats and custom V-twin motorcycles.
Diversification – Ilmor High Performance Marine, LLC.
As part of a broader desire to diversify the U.S. company's business base, Ilmor, Inc., entered the high-performance marine world in 2002, building race engines for the SuperCat Offshore Racing Series of the American Power Boat Association (APBA). Recognizing the business potential, Ilmor worked with then co-owner DaimlerChrysler to marinize and modify the Dodge Viper's V10.
Late that year, the first two prototype 550 HP engines were installed in a new 58-foot (18m) sport rubber dinghy. In close collaboration with Pete Hledin of Douglas Marine (the parent company of Skater) and Bob Morgan of Big Thunder Marine, the Ilmor V10's underwent extensive durability testing and the results were encouraging.
Armed with enough knowledge and experience from the initial marine exposure and having completed a comprehensive study of the marine business at large, Ilmor made long term plans to enter the powerboat business in a serious manner. Since 2004, Ilmor's high-performance marine division has enjoyed substantial growth, becoming a well-established supplier in the U.S. and European boat market. In addition to the MV10-550 engine, Ilmor created two additional performance variants: the MV10-625 in 2005, and the MV 7-10 in 2006. The 700-horsepower, naturally aspirated marine engine was developed with significantly improved fuel efficiency and a light-weight package. The MV10-550 was later upgraded to the 570 hp in 2006.
In 2009, Ilmor had to utilize its engineering expertise to create an entirely new generation of MV-10 marine products. Emissions requirements established by the California Air Resources Board (the most stringent in the U.S.), the federal Environmental Protection Agency and the European Union meant that all high-performance marine engines had to meet tough new exhaust emissions standards. The MV10-650 and the MV10-725, along with state-of-the-art Ilmor designed electronics were created to not only meet but exceed every requirement of the new regulations. Ilmor's MV10-725 is the highest output emissions certified gasoline engine commercially available in Europe.
As part of its overall marine business development plan, Ilmor also unveiled the all-new INDY high-performance stern-drive in 2009. The INDY drive, two and a half years in the making, was designed to complement not only all of the current Ilmor high-performance marine engines but to handle the power and torque of several other engines aimed for introduction at a later time. The addition of the INDY drive placed Ilmor High Performance Marine firmly into the ranks of marine powertrain suppliers.
Powerboat Racing World Champions
As a natural step for Ilmor, a decision was made in 2007 to enter the MV10 engine into powerboat competition. The twist for Ilmor, which is accustomed to manufacturing bespoke racing engines, was to race only engines identical to those already sold to the more typical high-performance powerboat customer. In the first year of competition for the engines, a pair of Ilmor Marine MV10-625 engines powered the #99 Fountain Worldwide “King of Shaves” powerboat to the coveted 2007 Powerboat P1 Evolution Class World Championship. The successful first year of competition was backed up with two additional European based Powerboat P1 World Championships in 2008 and 2009 and World Championship success in the US in 2008. The success validated Ilmor's belief that its production based high-performance marine engine could race and win against any competition throughout the world.
There has also been great success for the “Cinzano Bianco” race team in the UK marathon powerboat racing world championships. This boat was first raced in 2008 in the Cowes-Torquay-Cowes powerboat race with the MV10-625 engine. With the crew of Tim Grimshaw, Eric Smillie and Nik Keyser. It came fifth overall and second in marathon class B. It was then raced again in 2009 in the marathon class B series and came first in class and first overall for the class and the whole of the marathon powerboat series. With the crew of Marcus Hendricks, Eric Smillie and Tim Grimshaw. Then in 2010 it was re-rigged with the new range of MV10-725 engines. Shortly after the re-rig the boat was raced in the Around Ireland 2010 powerboat race, which it won overall and won its class. It was then raced in the Cowes-Torquay-Cowes powerboat race of 2010. With the crew of Marcus Hendricks, Eric Smille and Simon Woodpower.
In 2006, Ilmor announced that they would enter a two-bike team in the MotoGP motorcycle racing series and would enter a single rider team as a wildcard entry in the final two races of the 2006 season. For the 2007 MotoGP season, engine capacity was to be reduced to 800cc from 990cc so Ilmor's wildcard entries in 2006 would be the first appearance of an 800cc MotoGP motorcycle at a race meeting.[14]
On 18 December 2006, Ilmor Engineering confirmed via their website that Jeremy McWilliams and Andrew Pitt had been selected as riders for the 2007 season.[16] On 15 March 2007 after one race, the team announced that they were taking a break from Moto GP as a result of funding issues.[17] On 30 April they announced that they would run a "slimmed-down" set-up focused purely on engine development, releasing all unnecessary personnel but keeping riders McWilliams and Pitt under contract.
Championship Auto Racing Teams (CART) was a sanctioning body for American open-wheel car racing that operated from 1979 until dissolving after the 2003 season. CART was founded in 1979 by United States Auto Club (USAC) Championship Division team owners who disagreed with the direction and leadership of USAC, with the then-novel idea of team owners sanctioning and promoting their own series collectively instead of relying on a neutral body to do so. Through the 1980s, CART's Indy Car World Series became the pre-eminent open-wheel auto racing series in North America, featuring street circuits, road courses, and oval track racing. CART teams continued to compete at the USAC-sanctioned Indianapolis 500, which was effectively integrated into the series schedule.
Alfred Unser was an American automobile racing driver, the younger brother of fellow racing drivers Jerry and Bobby Unser, and father of Al Unser Jr. He was the second of four men to have won the Indianapolis 500 four times, the fourth of six to have won the race in consecutive years, and the winner of the National Championship in 1970, 1983, and 1985. The Unser family has won the Indy 500 a record nine times. He was the only person to have both a sibling (Bobby) and child as fellow Indy 500 winners. Al's nephews Johnny and Robby Unser have also competed in that race. In 1971, he became the only driver to date to win the race on his birthday.
John Kevin Cogan is an American former race car driver who drove in Formula One from 1980 to 1981. Driving a RAM Williams in the 1980 Canadian Grand Prix, he failed to qualify, suffering the same result driving for Tyrrell at the 1981 US GP West. He then moved over to Indy cars in 1982 but his career was cut short by a series of accidents.
Chaparral Cars was a pioneering American automobile racing team and race car developer that engineered, built, and raced cars from 1963 through 1970. Founded in 1962 by American Formula One racers Hap Sharp and Jim Hall, it was named after the roadrunner, a fast-running ground cuckoo also known as a chaparral bird.
Team Penske is an American professional auto racing organization, competing in the IndyCar Series, NASCAR Cup Series, IMSA SportsCar Championship and FIA World Endurance Championship. Debuting at the 1966 24 Hours of Daytona, the organization has also competed in various other types of professional racing such as Formula One, Can-Am, Trans Am, and Australia's Supercars Championship. Altogether, Team Penske has earned over 500 victories and over 40 championships in all of auto racing. Team Penske is a division of Penske Corporation, and is owned and chaired by Roger Penske. The team president is Tim Cindric.
Patrick Racing was an auto racing team in USAC, CART, Champ Car and the Indy Racing League. Patrick Racing was started by U.E. "Pat" Patrick in the 1970s. The team is best known for winning the Indianapolis 500 on three occasions, and the Indy car title twice. Patrick Racing achieved 45 Indy car wins.
The 78th Indianapolis 500 was held at the Indianapolis Motor Speedway in Speedway, Indiana on Sunday, May 29, 1994. The race was sanctioned by United States Auto Club (USAC), and was included as race number 4 of 16 of the 1994 PPG IndyCar World Series. For the second year in a row, weather was not a factor during the month. Only one practice day was lost to rain, and pole day was only partially halted due to scattered showers. Warm, sunny skies greeted race day.
Mario Illien is a Swiss engineer specialising in motorsport engine design and comes from Chur in the Canton of Graubünden, Switzerland. Despite living in a country in which motor racing was banned in 1955, he developed an interest in the sport during the 1960s while following the career of Jo Bonnier, a Swedish expatriate living in Switzerland.
The 1988 CART PPG Indy Car World Series season was the 10th national championship season of American open wheel racing sanctioned by CART. The season consisted of 15 races, and one non-points exhibition event. Danny Sullivan was the national champion, winning for Team Penske. The rookie of the year was John Jones. The 1988 Indianapolis 500 was sanctioned by USAC, but counted towards the CART points championship. Rick Mears won the Indy 500, his third victory at Indy.
The 1992 PPG Indy Car World Series season was the 14th national championship season of American open wheel racing sanctioned by CART. The season consisted of 16 races. Bobby Rahal was the national champion, his third and final career CART title. Stefan Johansson was named the Rookie of the Year. The 1992 Indianapolis 500 was sanctioned by USAC, but counted towards the CART points championship. Al Unser Jr. won the Indy 500 in the closest finish in the history of that event.
Galles Racing is a former auto racing team owned by Rick Galles that competed in the CART series, Can-Am and the Indy Racing League. The team won the 1990 CART championship as well as the 1992 Indianapolis 500, both with driver Al Unser Jr. The team won a total of 21 Indy car races along its history. In addition to Unser's 1992 victory, the team finished second at Indianapolis on three separate occasions.
Doug Shierson Racing is a former racing team that competed in the CART Indy car series from 1982 to 1990. The team was sponsored by Domino's Pizza for its entire run in CART. Shierson Racing won 7 Indy car races, with their biggest victory coming at the 1990 Indianapolis 500, with driver Arie Luyendyk. The team finished runner-up in the 1985 CART Championship with driver Al Unser Jr. losing the title by one point.
In 1986, the GM Motorsports group asked Delco Electronics Corporation (December), a subsidiary of GM Hughes Electronics if an electronic engine management system could be developed for the Chevy Indy V8 engines used in the CART open-wheel race series. Delco Electronics had been supplying all GM automobiles sold in the US with Engine Control Modules (ECMs) since 1981 when the US Clean Air Act required 3-way catalytic converters and controlled air-fuel ratios. The production ECMs were becoming more complex, and were becoming powertrain controllers controlling the transmission, spark timing, Idle speed, as well as air-fuel intake mixtures.
The Penske PC-23 was a highly successful CART racing car that competed in the 1994 IndyCar season with Penske Racing, and in the 1995 IndyCar season with Bettenhausen Motorsports. It was designed by Nigel Bennett, who based its design on the 1993 car, the PC-22, which was a radical departure from the basic concept of the previous Penske cars. The PC-23 was one of the most dominant open-wheel race cars ever developed. It won both the 1994 CART season, and the 1994 Indianapolis 500 with Al Unser Jr., together with Emerson Fittipaldi and Paul Tracy scoring 12 wins out of 16 in total, collecting 10 pole positions and 28 podium finishes, in a season that saw Penske also take the Constructor's Cup, and the Manufacturer's Cup with the Ilmor-Mercedes-Benz engine. Nevertheless, the car is mostly known for the controversial pushrod Mercedes-Benz 500I engine, designed and developed for the single race of Indianapolis, exploiting a loophole in different technical rules between the Indy 500 and CART sanctioning bodies at that time.
The Ilmor 265-A is a turbocharged, 2.65 L (162 cu in), V-8 Indy car racing engine, designed and developed by Ilmor, for use in the CART PPG Indy Car World Series; between 1986 and 1993.
The Buick Indy V6 engine is a powerful turbocharged, 3.0–3.4 L (180–210 cu in), V-6, Indy car racing internal combustion engine, designed and produced by Buick for use in the CART PPG Indy Car World Series, and later the IRL IndyCar Series; between 1982 and 1997. It shares the same architecture, and mechanical design, and is based on the Buick V6 road car engine. A slightly destroked 3.0-liter V6 engine was also used in the March 85G and March 86G IMSA GTP sports prototypes.
The Mercedes-Benz 500I engine is a highly powerful, turbocharged, 3.4-liter, Indy car racing V-8 engine, designed, developed, and built by Ilmor, in partnership with Mercedes-Benz, specifically to compete in the 1994 Indianapolis 500.
The Ford-Cosworth Indy V8 engine is a series of mechanically similar, turbocharged, 2.65-liter V-8 engines, designed and developed by Ford in partnership with Cosworth for use in American open-wheel racing. It was produced for over 30 years and was used in the United States Auto Club (USAC) Championship Car series, CART, and Champ Car World Series between 1976 and 2007. The DFX engine was the Indy car version of the highly successful 3-liter Ford-Cosworth DFV Formula One engine developed by former Lotus engineer Keith Duckworth and Colin Chapman backing from Ford for the Lotus 49 to campaign the 1967 season. This engine had 155 wins between 1967 and 1985 in F1. The DFX variant was initially developed for Indy car use by Parnelli Jones in 1976, with Cosworth soon taking over. This engine won the Indianapolis 500 ten consecutive years from 1978 to 1987, as well as winning all USAC and CART championships between 1977 and 1987. It powered 81 consecutive Indy car victories from 1981 to 1986, with 153 Indy car victories total.
The Mercedes-Benz Indy V8 engine, known as the Ilmor 265-D (1994), and later the Mercedes-Benz IC108 (1995-2000), is a powerful, turbocharged, 2.65-liter, Indy car racing V-8 engine, specially designed, developed, and built by Ilmor, in partnership and collaboration with Mercedes-Benz, to compete in the CART series; between 1994 and 2000.
The March 86C is a highly successful and extremely competitive open-wheel race car, designed by Adrian Newey, and built by March Engineering, to compete in the 1986 CART Indy Car season, and eventually the 1987 Indy Car season. The season was another whitewash and a clean-sweep for March, following up on the success of their 1985 campaign. The 86C chassis dominated the season, winning 14 out of the 17 races, and taking 13 pole positions. Newey's March 86C chassis successfully clinched the 1986 CART Indy Car championship and the 1986 Indianapolis 500 with Bobby Rahal. It was primarily powered by the Ford-Cosworth DFX turbo V8 engine, but also used both the Buick Indy V6 turbo engine, and the Ilmor-Chevrolet 265-A Indy V8 turbo engine.
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