Tuesday, March 10, 2015

Model A Engine Specifications Specs


Ford Model A Engine Specifications

Nut Sizes:
  • Front Motor Mount Castle Nut: 7/16″-20
  • Engine Head Nuts (grade 8): 7/16″-20
  • Connecting Rod Castle Nut: 7/16″-20
  • Ratchet Nut (attaches bottom pulley to crankshaft): 5/8″-18
  • Main Bearing Bolt Castle Nut: 1/2″-20
Stud Sizes:
  • Regular Head Studs: 3 1/2″ Long
  • Water Neck Studs: 5 3/4″ Long
Bolt Sizes:
  • Flywheel to Crankshaft Bolts: Four 7/16-20 by 13/16″ Long
  • Flywheel Housing to Block: Four 7/16″-14 by 1 1/16″ Long and two 7/16-14 by 1 11/16″ Long
  • Timing Cover Bolts: 3/8″-16 by 1 1/8″ Long
  • Side Timing Gear Bolts:One 7/16″-14 by 2 3/16″ Long and one 7/16″-14 by 1 3/8″ Long (lock washers can be used)
Torque Specs:
  • High Compression Head: 65 lbs
  • Standard Head: 55 lbs
  • Main Bearing Cap Torque 80-100 lbs
  • Flywheel Bolt Torque 65 ft/lbs
Specifications:
  • The stock compression ratio was about 4.22:1
  • Piston displacement 200.5 cu. Inches
  • Bore 3.875″
  • Rated H.P. 24.03 SAE
  • Brake H.P. 40
  • Firing Order 1-2-4-3
  • Stroke 4.250″
  • Gas Tank
    • 28/29– 10 GAL.
    • 30/31– 11 GAL.
Valves:
  • Valve lift .287″
  • Seat Angle: 45°
  • Stem Diameter: .311″
  • Port Diameter: 1 3/8″
  • Valve Opening Diameter: 1 3/8″
  • Valve Guide Clearance:
  • Exhaust: .002″
  • Intake: .001-.0015
  • Valve Spring Length:
  • Free: 2 15/16″
  • Compressed Length: 2 1/4″
  • Valve Spring Force (compressed): 57-64 lbs.
  • Valve Timing:
    • Intake:
      • Opens 7 1/2° before TDC (top dead center)
      • Closes 48 1/2° after BDC (bottom dead center)
    • Exhaust:
      • Opens 51 1/2° before BDC
      • Closes 4 1/2° after TDC
Flywheel:
  • Weight: 63 lbs., 4 oz.
  • Balance: Within .15 In/oz.
  • Clutch Mounting Surface: True with crankshaft within .005″ TIR.
  • Clutch Mounting Shoulder Diameter: Concentric with crank flange diameter within .005″ TIR.
Carburetor:
  • Throat Size: 1″
  • Float Level: 1″ from float to machined surface.
  • Main Jet: #63 drill bit
  • Cap Jet: #63 drill bit
  • Idle Jet: # 75 drill bit
Carburetor Assembly
Click Image to Enlarge
Carburetor Info
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Carburetor Adjustment
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Exhaust System:
  • Exhaust Pipe: 2″ ID (Inside Diameter)
  • Tail Pipe: 1-5/8″ ID
Miscellaneous:
    • To remove a stuck head from a “firing” engine you can loosen the head nuts about 1/8″ from the head and start the motor the compression will pop the head up and the motor will stall.
    • Crankshaft weight 28 lbs.
    • Engine Oil Capacity:
  • From Empty: 5 Quarts
  • Oil Change: 4 1/2 Quarts
  • Spark Plugs: Champion 3X, 7/8″-18
  • Spark Gap: .035″
Engine Oiling System
Model A Engine Head Torquing Procedure



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Source:  http://www.motormayhem.net/model-a-ford-reference-page/engine-specifications/

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