Re-Engineering the Model A Engine
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  • Main Article
    • 01. Differences Between Model A and Modern Design Practices
    • 02. Evolution of the Model A Ford Engine
    • 03. Racecars
    • 04. Comments on Modified Engines
    • 05. Groundwork for Redisign
    • 06. Constraings Imposed
    • 07. Engineering Methodoligy (Old vs. New)
    • 08. Wishlist for Redisign
    • 09. Operating Conditions and Assumption
    • 10. Summary of What Can Be Done
    • 11. Engineering Starting Point
    • 12. Connecting Rod Design (A-6200)
    • 13. Crankshaft Design (A-6303)
    • 14. Main Bearing Caps and Rear Main Read Seal Design
    • 15. Cylinder Block Design (A-6015)
    • 16. Assembly of Cores
    • 17. Machined Casting Solid Model
    • 18. Oil Pump Drive Bearing Design (A-6560)
    • 19. Other Parts
    • 20. Comment on Machine Shops and Rebuilt Engines
    • 21. Assembling the New Engine
    • 22. Filling a Void
    • 23. Status of Engineering
    • 24. Whats Next
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OPERATING CONDITIONS ASSUMPTION


 In addition to the wish list of changes, operating conditions need to be assumed for this engineering study. These operating conditions are required to perform an FEA (finite element analyses) that will determine the stress and strain at every point in each of the parts. Knowing the stress and strain enables the engineer to choose appropriatmaterials, heat treatment, and surface finish for that part. 


For this engineering study and redesign, the condition chosen for continuous operation (unlimited fatigue life) is 150 horsepower at 5000 RPM (158 lb-ft @ 5000 RPM). These numbers equate to about 112 miles per hour with a 3.78 rear end ratio with 4.75x19 tires. Although this condition appears unrealistic, it has been assumed for calculating stresses in this engineering study, and will provide a margin of safety for loads that can’t be reliably calculated such as shock loading, loads due to detonation, loads due to poor machine work in a later rebuild, etc.

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