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  Scarab F1 Offenhauser
 

Scarab F1 Offenhauser Scarab F1 Offenhauser Scarab F1 Offenhauser Scarab F1 Offenhauser Scarab F1 Offenhauser Scarab F1 Offenhauser
Scarab F1 Offenhauser Scarab F1 Offenhauser Scarab F1 Offenhauser Scarab F1 Offenhauser Scarab F1 Offenhauser Scarab F1 Offenhauser
Scarab F1 Offenhauser Scarab F1 Offenhauser Scarab F1 Offenhauser Scarab F1 Offenhauser Scarab F1 Offenhauser Scarab F1 Offenhauser
Click here to save all images    Image credits: Wouter Melissen 

Model history:
Click here to download printer friendly version When the Scarab Formula 1 car debuted at Monaco in 1960, an American Grand Prix victory was long overdue. The last and only success dated back to 1921 when Jimmy Murphy won the French Grand Prix in a Duesenberg. Since then open-wheel racing moved into different directions on the two continents. Lance Reventlow's Scarab project was the first serious American Grand Prix effort since the introduction of the Formula 1 class.

The young heir to the Woolworth fortune, Reventlow had made quite an impact during the 1958 season. Built by a 'dream-team' of engineers in California, his V8-engined Scarab sports cars outclassed many established manufacturers like Ferrari and Maserati in the American championship. The next objective were the world championship races in Europe. An Offenhauser built three-litre engine was tried to comply with the regulations but it was not powerful enough to match Europe's finest.

With no other American engine available that would fit the bill, Reventlow abandoned the sports car program after a single season. He spent the next year and a large chunk of his vast resources on creating an all-American Formula 1 car. The program was up against it from the outset; single-seater racing was on the brink of the mid-engined revolution and none of the engineers involved had any experience designing or developing a Formula 1 car. Reventlow's desire to rely exclusively on American built components complicated the project even further.

The responsibility of developing the chassis was placed on 23-year old Marshall Whitfield, even though he had never designed a car before. He penned a wholly conventional steel spaceframe chassis. Suspension was by double wishbones and coil springs on all four corners. Much time and money was wasted on the development of a proprietary drum-brake system. Reventlow eventually caved and ordered the far superior but British Girling disc-brakes. Chunky Halibrand wheels and Goodyear tyres completed the package.

Offenhauser's Leo Goossen worked on a bespoke four-cylinder engine for the Formula 1 car. The all-aluminium engine followed the familiar Offenhauser pattern with one major exception; the desmodromic valve-train. The design for the sophisticated system was 'inspired' by the Mercedes-Benz 300 SLR, which had been on display in the Henry Ford Museum. The desmodromic or positively actuated layout featured valves that were opened and closed by the camshafts. With no need for valve-springs, it allowed for much higher engine speeds.

America's first Formula 1 engine displaced just under the maximum of 2.5 litre. It was designed to be on par with the likes of Ferrari and BRM, who both claimed to produce 280 bhp. The desmodromic system worked flawlessly but it struggled to get to 220 bhp no matter how hard they revved the engine. The original plans had called for an infinite-ratio automatic transmission. Despite making a sizeable dent in the resources it never materialised. Eventually the team had to settle on a Corvette-sourced four-speed manual.

The all-American package was clothed in a very conventional aluminium body. Two cars were built and finished in the white and blue American racing colours also used for the Scarab sports cars. This included beautiful detailing by Los Angeles based artist 'Von Dutch'. Upon completion, they were shipped to Europe for Monaco Grand Prix. Ironically, the Scarab team was assigned the same garage as Cooper. Their small, mid-engined machines very much represented the future, making the Scarabs look outdated before they even turned a wheel.

Once on track, it only became worse for Lance Reventlow and fellow driver and engineer Chuck Daigh. The Scarabs were hopelessly off the pace and a last minute switch to Dunlop rubber made little difference. Stirling Moss was asked to drive the car to make sure the drivers were not to blame; they weren't. The American cars were a full eight seconds off the pace and slower even than the diminutive Formula Juniors that raced in one of the support events. Needless to say both cars failed to qualify for the race.

The tight and twisty Monaco street circuit was probably the track least suited to the Scarab on the calendar, so all hope was not lost. Next up was the Dutch Grand Prix at Zandvoort where the cars indeed performed better. Daigh was particularly impressive and managed to set the 15th fastest time in qualifying. After some of the rivals questioned the Scarab's times, an upset Reventlow withdrew his team. In doing so, he robbed Daigh of his maiden Grand Prix start.

Daigh did make his debut during the next round at the very challenging Spa circuit. He started from the last position on the grid and struggled on in the race until he lost all oil. Reventlow also participated but his race was cut short when a piston punched a hole in the block after only two laps. The young heir had lost all confidence and had Richie Ginther flown in for the final European round at Reims. Further engine failures in practice depleted the spares' inventory and neither Daigh or Ginther were able to start.

There was one more Grand Prix on the schedule; the American Grand Prix at Riverside. This was almost literally in Scarab team's backyard and Daigh convinced Reventlow to let him enter the car. Before the race he extensively lightened the car and reworked the engine to make it more reliable. To his credit the changes certainly had an effect and he qualified 16th out of 23 starters. In the race he suffered from vapour lock problems but nevertheless finished 10th. He was the best placed of the few front-engined cars still in the field.

A drop of the displacement limit to 1.5 litre for 1961 meant that the Scarab Formula 1 car was now also officially obsolete. Daigh used his car with a three litre engine in some Intercontinental races until he wrote it off in a big shunt at Silverstone. Reventlow retained his own car and fitted with a V8 engine it starred in a short movie by Bruce Kessler called the 'The Sound of Speed'. A third, spare chassis was also built but never completed.

For many years the failure of the Scarab Formula 1 car was primarily blamed on the archaic chassis layout and Reventlow's obsession with using American components. Much later Daigh found that there was another contributing factor. While rebuilding the engine out of his old car, he found that the drawings called for a valve lash of 0.002 in and that the engines had actually been built with a 0.012 in lash. When he set the engine up correctly, he immediately got up to 265 bhp. That additional 45 bhp could have made the Scarabs a lot more competitive on the faster circuits like Spa and Reims.

After the humiliating foray in Formula 1, Reventlow all but lost interest in motor racing. His men only built two more cars; a single seater and a sports car, both mid-engined. Many years later and with a slightly larger engine, American historic racer Don Orosco did score some successes with the ex-Reventlow Formula 1 car in Europe. The dream of an American Grand Prix car lived on and the likes of Dan Gurney and Roger Penske eventually managed to be competitive with 'American' cars in F1, but only briefly. More recent attempts have been far less successful.


Chassis: GP-1
Chassis GP-1 The first of three Scarab Formula 1 cars built, chassis GP-1 was used by Reventlow and Ginther in the European rounds of the team's Grand Prix campaigns. It was subsequently rebuilt with one of the Chevrolet V8 engines left over from the sports car program. In this guise it starred in the 1962 Bruce Kessler short 'The Sound of Speed.' Both Daigh and Reventlow can be seen throwing the very potent Scarab around Riverside. The movie even appealed to non-car people and was America's entry in the short feature category of the Cannes Film Festival.

Some time after Reventlow's untimely death in a 1972 plane crash, the ill-fated Formula 1 car was sold on. It eventually ended up in the hands of American historic racer Don Orosco, who also owned one of the Scarab sports cars for many years. He completely restored the car and fitted it with a conventional three-litre Offenhauser engine. In this guise he raced the car very successfully against strong competition in Europe for many years. More recently he tracked down the team's original transporter and had that also painstakingly restored. Today he only rarely competes in Europe but he made an exception for the 2009 Goodwood Revival where his son drove GP-1 and Don himself was out in GP-2. The weekend did not quite go as planned a driveshaft failure meant that GP-1 could not make it out to the grid.

Chassis: GP-2
Chassis GP-2 The second chassis was used by Daigh throughout the 1960 season. In heavily modified form, he placed it 10th at Riverside, which was the team's only finish of the season. After the car was rendered obsolete for Grand Prix racing, Daigh fitted a three litre Offenhauser engine with a conventional valve-train. He entered the car in the first races of the new for 1961 'Intercontinental Formula' in England. He suffered a big accident at Silverstone, ending the car's contemporary racing career on the spot. All the bits that survived the crash were sent back to California.

The remains of chassis GP-2 were left in a warehouse until the mid-1980s when they were acquired by American Ali Lugo. He asked Dick Troutman, who had been deeply involved with the Scarab sports cars, to build him a new chassis. All the surviving bits, including the suspension, steering rack, radiator and fuel tanks, were bolted used to reconstruct the car. The crash had done much damage to the rear of the car but the nose section could be used again. Initially Lugo had a Chevrolet V8 fitted but discovered Daigh had the car's original engine still lying around. It was during the rebuild of this engine that Daigh discovered the mistakes that caused sophisticated Offenhauser 'four' to perform so poorly in period.

Lugo showed the car on both sides of the Atlantic on many occasions in both Chevrolet and Offenhauser configuration. The events the car appeared at included the Goodwood Festival of Speed, the Amelia Island Concours d'Elegance and the Louis Vuitton Classic in both New York and Paris. In 2005, Lugo decided to part with the Scarab Formula 1 car and entered it in the RM Auctions Monterey sale. An unsuccessful high bid of $190,000 fell well short of the $350,000 - $500,000 pre sale estimate. Eventually the car did change hand as it joined the Don Orosco stable. Reunited with its sister car and the team's original transporter, it has been shown at various events. Orosco entered the two cars for the 2009 Goodwood Revival but unfortunately had a crash in practice and could not take part in the race.

Article by Wouter Melissen, last updated on May 12, 2010

Add your comments on the Scarab F1 Offenhauser

 Scarab F-1  
norrislex
05-12-2010
Rumor had it that during one of the lay-overs between races one of the Scarab mechanics took it upon himself to replace the fuel injection (American made) with a set of Weber Carbs. and completely changed the character if the car. As I stated this is/was a rumor, and it has some 50 years of dust on it..Great series of articles you have going here, hold with it please.
     

General specifications
Country of origin United States
Chassis number GP-1 / GP-2
Numbers built 3
Produced in 1960

Engine
Configuration Offenhauser Straight 4
Location Front, longitudinally mounted
Construction aluminium alloy block and head
Displacement 2.441 liter / 149 cu in
Bore / Stroke 95.3 mm (3.8 in) / 85.7 mm (3.4 in)
Compression 10.0:1
Valvetrain 2 valves / cylinder, DOHC
Fuel feed Hilborn Travers Fuel Injection
Aspiration Naturally Aspirated
Power 220 bhp / 164 KW @ 7500 rpm
BHP/Liter 90 bhp / liter

Drivetrain
Chassis aluminium body on steel spaceframe
Suspension (fr/r) double wishbones, coil springs over shock absorbers, anti-roll bar
Steering rack-and-pinion
Brakes Girling discs, all-round
Gearbox 5 speed Manual
Drive Rear wheel drive

Dimensions
Weight 550 kilo / 1212.5 lbs
Wheelbase / Track (fr/r) 2286 mm (90 in) / 1270 mm (50 in) / 1270 mm (50 in)

Performance figures
Power to weight 0.4 bhp / kg
Top Speed 250 km/h (155 mph)

Resources
Suggested reading
  • Vintage American Road Racing Cars (1950-1970), by Harold W. Pace and Mark R. Brinker
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