Thanks Ray, in recent years when giving one of Garrie's Monos a quick inspection at Baskerville Dad was able to confirm by feel the drilling done to lighten the steering arms. Garrie's wheels were machined thinner too!
Edit - In Ray's post #13 - it may be Tony Maw in the second last shot that features the concrete wall ?
Second Edit - Adrian Van Loon's article, appearing in Australian Autosportsman, November 1968
The type 600 Elfin, introduced as a protoype early in 1968, has taken the best part of the Gold Star Series to score any points. However the victorious debut in Malaya and the more recent second place in the Sandown round of the Gold Star series prove that the car is basically "right".
More important, actually, is the promise which the design offers for next year: as this report shows, the car can accept a variety of engines, and orders have already been placed with Elfins for a number of replicas.
The subject of this article is Garrie Cooper's own car, which has been racing with a 1760cc twin cam Ford motor. "Autosportsman" is grateful for the assistance given by Garrie Cooper in supplying information and arranging for photographs.
The 600 has not made many racing appearances during the year, and its record suggests Garrie Cooper has been using the car more for testing and development than for chasing victory at any price. The car has been used to test an airfoil at Mallala (see "Technical Camera", October), and has had several engine failures. However, there have been no chassis bothers; and it is likely that a driver with less on his mind than Cooper could better the following times: Mallala 1m 15.4 (1.5 record 1m 15.7), Sandown 1m 13.7.
The 600 should not be considered as a purely 1.5-type car, either: a variant designated the 600A can be built for 1500 or 1100 pushrod engines (or smaller budgets), using smaller brakes, lighter transmission components and non adjustable shocks; a further variant, the 600C, can accept Tasman Formula engines and uses fabricated front uprights with live hubs, plus detail items such as 15" rear wheels and a larger radiator. In other words the Elfin 600 design is aimed for every level of Australian national racing, and the car should be seen in ever increasing numbers during next season.
The body styling gives the first clue that the 600 is an all-new Elfin. It has a distinctive wedge shape to the nose, along the lines set down by Garrie Cooper and Ron Lambert. The sides of the car are formed by the pannier fuel tanks, but the detachable nose/screen section is in fibreglass, using two layers of 1 1/2" chopped strand mat.
Removal of the body reveals the tube chassis. Cooper states that the reason for his return to steel tube is that a variety of engines can be mounted in the car without problem, as only triangulating tubes need to be modified.
The Elfin Mono was specifically designed around the four cylinder Ford unit and to fit an engine of larger physical dimensions would necessitate a complete new engine bay design.
The 600's space frame is constructed of 16, 18 and 20 guage tube in round, square and rectangular forms, nickel bronze welded with a stove enamelled finish. the 2" by 1" rectangular rear crossmember is detachable and the cockpit area has triangular sides, "punched" steel stiffeners and built in safety harness mounting points.
The whole unit is further stiffened by a stressed alloy undertray which is rivetted and bonded with poxy-resin. Due to experimenting with the prototype, the current 600 offers 100% more torsional stiffness rigidity than the original design.
The front suspension has slight anti-dive geometry and is by unequal length wishbones. Armstrong coil/shock units are used with spring rates of either 212 or 220 lb/inch. It is fully adjustable for caster, camber, toe in and ride height and has a fully adjustable anti sway bar. Static centre roll centre height is at ground level. The front uprights are steel forgings (Herald-type) with cast alloy hubs and heavy duty stub axles.
The rear suspension, also fully adjustable, features lower reversed "A" frames, top transverse links and trailing radius arms of 1" diameter 18-gauge tube. Other suspension arms are 7/8" or 1". diameter 16-gauge tubes. All parts are heat treated for hydrogen embrittlement after chrome plating. The rear Armstrong spring/shock absorber units are rated at 225 lb/in and are attached to cast magnesium hub carriers.
The car has 10 5/8" dia. x 3/8" wide disc brakes up front, with Girling light alloy racing calipers. The rear has 10 1/2" discs, again using the Girling calipers. A dual brake system is fitted with twin master cylinders, allowing a full adjustment of the front to rear braking ratio.
Although the works car is fitted with sliding spline double-jointed drive shafts and light weight forged hub shafts, tubular driveshafts with Rotoflex "doughnut" type couplings are an offered alternative.
Steering is by Elfin rack and pinion in a magnesium cast housing; steering wheel size and ratio can be built-in to suit any driver.
The cooling system incorporates an alloy crossflow radiator mounted in the nose. Water is carried to the engine through the right lower chassis tube and returned through the left upper chassis tube. A 13 p.s.is cap is fitted. The oil radiator is mounted ahead of the water unit, with the alloy oil tank mounted between the radiator and the front bulk head, which carries the pedals and the master cylinders. The oil is carried to and from the engine in alloy tubes separate from the chassis.
The fuel system consists of two complicated tanks mounted in the triangular sides of the cockpit. Constructed of welded sheet aluminium, they have a total capacity of 12 imperial gallons. A one gallon collector tank is mounted behind the semi reclining black vinyl glass fibre seat and from there the fuel is delivered to the engine via the fuel pump mounted in the engine bay.
The works 600 has an Elfin modified twin cam Lotus-Ford motor, which features a Laystall crankshaft and Cosworth connecting rods. Two 45 DCOE Weber carburettors are used and 180 BHP has come up on the dynometer.
The 7 1/4" diameter single dry plate clutch is of Porsche origin, with Elfin mods. A Hewland FT200 gearbox is used with five forward speeds and reverse, with some 26 alternative forward ratios available and quickly changed. A limited slip differential is fitted with 8/31 or 9/31 crown wheel and pinion.
The Elfin designed wheels, cast in magnesium by the Commonwealth Aircraft Corporation, are of 13" diameter, with 8 1/2" rims front and 12" rims rear. Firestone 5.00-9.50 x 13 and 6.00-13.00 x 13 tyres are fitted.
Wheelbase 92 1/2"
Track 54 1/2" f , 55 1/2 " rear
Edited by SJ Lambert, 18 February 2013 - 23:19.