Tag Archives: Turbocharged

Twelve Hundred Horsepower – Shadow Chevrolet DN2 #DN2-2A

Despite the loss of it’s sponsor Johnson’s Wax, the number of events being cut back to eight, down from eleven in 1970 and the number of entrants falling to an all time low, just 15 at Edmonton, the 1973 Can Am Challenge was still a huge draw for spectators who wanted to see the worlds hitherto most powerful racing cars competing on road courses. According to contemporary reports attendances at all of the races in the 1973 Can Am Challenge were up.

Shadow Chevrolet DN2,  Rosso Bianco Collection,

Only two teams prepared new cars for the 1973 one of them was Shadow who built two DN2’s designed by Tony Southgate, one of those cars ran a regular 730 hp 8.1 litre / 494 cui Chevrolet V8, while the second car, featured today ran with a turbocharged version of the motor.

Shadow Chevrolet DN2,  Rosso Bianco Collection,

Both DN2’s were completed too late to undergo any testing prior to the start of the season and so presented little challenge to the teutonically prepared Porsche 917/30 driven by Mark Donohue for the Penske team. Jackie Oliver retired the normally aspirated DN2-1A from the opening two rounds of the 1973 Can Am Challenge run at Mosport and Road Atlanta with gearbox and suspension failures respectively.

Shadow Chevrolet DN2,  Rosso Bianco Collection,

Shadow team owner Don Nichols was entered to debut today’s featured car, seen at the Rosso Bianco Collection by Frank ‘Duc-man’ Christmann in Germany several years ago, at Watkins Glen in July 1973 but the car did not show. When #DN2-2A did show up at the next round at Mid-Ohio it was kept as a spare. Jackie Oliver scored a 3rd in the final at Mid Ohio which translated to a final 8th place overall having finished 12th in the heat.

Shadow Chevrolet DN2,  Rosso Bianco Collection,

James Hunt took over the normally aspirated DN2 at Road America while Jackie Oliver tried the turbocharged DN2-2A, they qualified 14th and 21st respectively. James did not start thanks to recalcitrant fuel metering unit while Jackie who had not set a time in qualifying lasted just 3 laps before the 1200 hp motor failed.

Shadow Chevrolet DN2,  Rosso Bianco Collection,

At Edmonton the Shadow team ran just DN2-1A and Jackie recorded a third place finish from seventh on the grid, driving the same car at Laguna Seca Jackie went one better finishing second from 5th on the grid, while Vic Elford tried the turbo charged DN2-2A which he qualified 18th but retired with brake failure after completing 22 of the 66 scheduled laps.

Shadow Chevrolet DN2,  Rosso Bianco Collection,

At the season ending race run at Riverside Jackie qualified 9th in DN2-1A, while Vic was 14th on the grid, however neither car lasted more than a handful of laps, Jackie retired with bodywork damage on lap three while Vic retired with a broken throttle linkage after the opening lap.

Shadow Chevrolet DN2,  Rosso Bianco Collection,

The Shadow DN2’s, which bear a passing resemblance to the 1972 Lola T310, were not seen again in period. It should be noted George Follmer never raced a Shadow DN2 although he did join the Shadow team for the Can Am Challenge in 1974, it remains a mystery as to why George’s name should appear on the side of the car.

I hope you will join me in thanking Frank “Duc-man” Christmann for sharing today’s photographs.

Thanks for joining me on this “Twelve Hundred Horsepower” edition of “Gettin’ a li’l psycho on tyres” I hope you will join me again tomorrow when I shall be visiting Quail Councours d’Elegance for Ferrari Friday. Don’t forget to come back now !

Share

Taxi Driver – Jim Robbins Eagle Ford T/C Mk 2

Continuing GALPOTS potted history of the Indianapolis 500 Ed’s photos shown here today were taken in 1969, when Ed Arnaudin took the opportunity to get good and close to the Jim Robbins team again.

Indy69 001s

The driver of the #67 Eagle Ford is Lee Roy Yarbrough, not related to Cale Yarborough, from Jacksonville, Florida.

Lee Roy is said to have won his first race at 19 at a local dirt track and progressed through the NASCAR Sportsman Division with 11 wins and onto Modifieds where he won 83 features in 3 years.

On reaching the top Grand National Division, today called Sprint Cup he won 14 races from 198 starts over 12 years. His best season was 1969 7 wins, including Darlington, Charlotte and both races at Daytona, from 31 starts in the seasons 54 races. Many retirements due to engine failure kept him out of the title hunt won by David Pearson.

Lee Roy made just three starts in the ‘Indy 500’ in ’67 ’69 and ’70 his best finish was in 1970 when he completed 107 laps and retired with turbo failure and was classified in 19th place.

His career, as were several others,was adversely affected by the withdrawal of Ford from competition and Yabrough disappeared from NASCAR after failing to secure a ride for the Daytona 500 in 1973, he was eventually admitted to a mental hospital where a fall inflicted a fatal traumatic brain injury aged 46.

#67 Lee Roy Yarbrough 1969s

Jim Robbins turned up at the Brickyard in 1969 with three vehicles the #10 and #27 Vollstedts and the #67 Eagle Ford Mk 2, seen here, a design inspired by UK free lance design consultant Len Terry. This vehicle appears to be one of several built in 1968, though at this stage I do not know it’s exact history prior to the 1969 race.

After Denny Zimmerman failed to get the #67 up to speed in 1969 Lee Roy Yarbrough moved over from his ride in the #27 Vollstedt to qualify 8th for the Indy 500, during the race a turbo pipe broke sending him into retirement and a final classification of 23rd.

Indy69 008s

All of Jim Robbins 1969 entries were powered by turbocharged Ford engines, a turbocharger had first been used at Indy in 1952 on the Cummins Diesel.

With the arrival of the normally aspirated 4,195 cc / 255 cui Ford V8’s in 1963, several Offenhauser powered teams turned to supercharging smaller 2,752 cc / 168 cui motors to remain competitive in 1965, following the lead set by Novi some years earlier.

A couple of Offenhauser powered vehicles had mechanically more efficient turbochargers fitted to these smaller motors in place of the superchargers in 1966. Bobby Unser drove his Eagle Offy to the first turbocharged victory at Indianapolis in 1968.

In 1969 Ford also went the smaller capacity turbocharged route and only three cars in the 33 car field of ’69 did not have smaller 168 cui engines with turbochargers fitted.

Note how the large turbocharger air intake on the left rear of the #67 is rearward facing so as to avoid the problems experienced by the Cummins Diesel turbocharger in 1952 which sucked up so much debris from its front facing turbo air intake that the turbines terminally failed on lap 40.

I’d like to thank Steve Arnaudin for scanning today’s photographs and Amphicar at The Nostalgia Forum for his help in identifying the car.

Hope you have enjoyed today’s Len Terry inspired edition of ‘Gettin’ a lil’ psycho on tyres’ and that you’ll join me again tomorrow. Don’t forget to come back now !

Share