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The Lotus Valiant

All information on this page was provided by Russell L Shreve

Russell Shreve wrote: This is the Lotus 11B with the first HyperPak dyno test engine. It is the first race car to successfully use the engine as a stressed member of the chassis. Colin Chapman asked me how I made it work, because he had tried it in an early design of his that was a disaster. He used my answer to design the Ford-Indy-Lotus. I would like to find the Lotus-Valiant. Maybe someone out there knows where it is, but has no idea of its history.

Lotus-Valiant chassis rear left quarter view ith body off.  The load path is from the rear suspension points. through the central structure around the transmission, through an aluminum plate between the transmission and engine, through the engine to the front suspension.  The differential is a Valiant rear axle I modified to a DeDion arrangement. Gear ratios were changed by exchanging the three differential assemblies, each with a  different ratio. After unbolting the half-shafts, the differential assembly detached from the frame by removing three bolts. 


The dyno development engine for the HyperPak.  Note the Mylar Valiant sticker. 


Lotus-Valiant at early race before paint.  If you wondered where the carburetor went, now you know.  This system worked perfectly even at 186 mph! 


Construction Aluminum fabrication with light weight, aerodynamic shape
Type Lotus Mark Eleven
Frame Space structure of welded steel tubing and riveted on stressed sheet aluminum; engine used as stressed member to give chassis torsional rigidity.
Length 135 inches
Width 62 inches
Height 27" (at cowl), 33" (at windscreen)
Wheelbase 86 inches
Tread 7 inches
Source Valiant HyperPak
Type 6-cylinder in-line overhead-valve
Bore 3.41 inches
Stroke 3.125 inches
Capacity 170 cubic inches (2.79 liters)
Horsepower 182
Fuel System Side-mounted 7 gallon aluminum fuel tank, engine mounted mechanical fuel pump
Warner T-10  4-speed synchromesh
Source Modified Valiant
Mounting Sprung
Ratios 3.23, 3.55, 3.91:1
Front Suspension
Type Independent
Standard production parts Knuckles, hubs, steering arms, upper control arms
Steering Rack and pinion
Fabricated parts Anti-roll bar, lower control arms, coil-shock springing
Rear Suspension
Type DeDion: 4-link parallel geometry with right hand lower link triangulated, coil-shock springing
Wheels and Tires
Goodyear racing tires Front 4.5 - 5.0, Rear 5.5 - 5.9
Wheels 15" Dunlop steel rim and wire spoke with center knock-off mounting; 4.5" width front, 5.5 rear
Type Girling 9.125" disk with alloy calipers
Front mounting Wheels
Rear mounting Inboard, at differential
Radiator Custom made, high density core, cross flow, separate header tank
Overall 1406 lb with full tank of gas (7 gallons)
Distribution 45/55
Weight:Horsepower ratio 8.6 lb/hp
Engine 533 lb
Final drive 73 lb
Transmission (w/propshaft, etc) 104 lb
Front suspension 47 lb
Rear suspension 31 lb
Steering 25 lb
Wheels and tires, incl spare 152 lb
Brakes 60 lb
Electrical 38 lb including battery, wiring, instruments, controls
Cooling 23 lb
Chassis 24 lb including exhaust, fuel system, clutch
Frame 106 lb steel, 40 lb aluminum
Body 64 lb - includes 6 lb seats and trim
Liquids 87 lb (fuel, water, water)

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