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Mark II GT Sports Car Disc Brake System Part I. Design and Development Part II. Testing
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English
Abstract
The design and development of Mark II GT brake system within the parameters dictated by the Mark I chassis presented many problems. The Mark II GT with its larger 427 cubic inch engine had more weight and much higher performance than the Mark I. Space limitations of the carryover wheels and suspension imposed a severe handicap on individual brake component design. This was compounded by shortening the normal one year development time to a three month period.
Part I of this paper is devoted to the consideration of factors which control the design of a brake. The concept of kinetic energy and its effects on brake performance is reviewed briefly. Use of the ventilated rotor design is explained for applications where severe heat is a problem, as in the case of the Mark II GT.
The development of the brake system from the 24 hour Daytona endurance race to the Le Mans Grand Prix race is reviewed. And unique rotor problems resulting from the various energy loads experienced at Daytona, Sebring and Le Mans are analyzed.
In Part II the brake dynamometer, its automatic programmer and the logic of race simulation duty cycle are described.
Use of Ford's new Reliability Laboratory brake dynamometer for screening of potential rotor designs is explained. In the screening process, dynamometer results proved that significant brake development work can be performed in a laboratory where a race can be simulated under carefully controlled conditions.
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Topic
Citation
Ihnacik,, J. and Meek, J., "Mark II GT Sports Car Disc Brake System Part I. Design and Development Part II. Testing," SAE Technical Paper 670070, 1967, https://doi.org/10.4271/670070.Also In
References
- Eksergian C. L. “Steady State Thermal Capacity of Ventilated Rotors” Kelsey-Hayes Company Report July 1962 Romulus, Michigan
- Fazekas G. A. G. “Temperature Gradients and Heat Stress In Brake Drums” S.A.E. Summer Meeting Atlantic City, New Jersey June 6 1952
- Petrof R. C. “Transient Temperatures in Brakes” Ford Motor Company Report No. AR 65- 14 May 1965 Dearborn, Michigan
- Eksergian C. L. “Design Approach to the Automotive Disc Brake” S.A.E. Meeting Detroit, Michigan March 1956
- Newcomb T. P. “Temperatures Reached In Disc Brakes” Journal Mechanical Engineering Science 2 3 1960 167
- Koffman J. L. “Ventilated Disc Brakes” Automotive Egnineer July 1956 277
- Crosby V. A. “Metallurgical Development In Brake Drums” S.A.E. Meeting Detroit, Michigan January 1959