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Home >> Mazda >> 1994 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 1.8L 4-CYL >> Engine Specifications

Engine Specifications

GENERAL SPECIFICATIONS

Application Specification In. (mm)
Displacement 112.2 Cu. In.
Bore 3.27" (83.0)
Stroke 3.35" (85.0)
Compression Ratio 9.0:1
Fuel System PFI
Horsepower @ RPM 128 @ 6500
Torque Ft. Lbs. @ RPM 110 @ 5000
CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS

Application In. (mm)
Crankshaft
End Play
Standard .0031-.0111 (.079-.282)
Maximum .012 (.30)
Maximum Runout .0016 (.040)
Main Journals
Diameter 1.9660-1.9668 (49.938-49.956)
Out-Of-Round & Taper .002 (.05)
Oil Clearance
Standard .0007-.0014 (.018-.036)
Maximum Wear Limit .0039 (.100)
Crankpin Journal
Diameter 1.7693-1.7699 (44.940-44.956)
Out-Of-Round & Taper .002 (.05)
Oil Clearance
Standard .0008-.0027 (.017-.068)
Maximum Wear Limit .0039 (.100)
CONNECTING RODS

Application In. (mm)
Bore Diameter
Crankpin Bore 1.8898-1.8904 (48.000-48.016)
Pin Bushing Bore .7875-.7880 (20.003-20.014)
Center-To-Center Length 5.230-5.234 (132.85-132.95)
Maximum Bend .003 (.08)
Side Play
Standard .0043-.0103 (.110-.262)
Wear Limit .012 (.30)
PISTONS, PINS & RINGS

Application In. (mm)
Pistons
Clearance
Standard .0013-.0023 (.032-.059)
Maximum .006 (.15)
Diameter
Standard 3.2659-3.2667 (82.954-82.974)
Pins
Diameter .7869-.7871 (19.987-19.993)
Piston Fit -.0002-.0005 (-.005-.013)
Rings
End Gap
No. 1
Standard .006-.012 (.15-.30)
Wear Limit .039 (1.0)
No. 2
Standard .006-.012 (.15-.30)
Wear Limit .039 (1.0)
Oil Ring
Standard .008-.028 (.20-.71)
Wear Limit .039 (1.0)
Side Clearance
Standard .0012-.0026 (.030-.065)
Wear Limit Wear Limit
CYLINDER BLOCK

Application In. (mm)
Cylinder Bore
Standard Diameter 3.2677-3.2684 (83.000-83.019)
Maximum Taper & Out-Of-Round .0007 (.019)
Deck Height
Standard 8.720 (221.5)
Minimum 8.712 (221.3)
Maximum Deck Warpage .006 (.15)
CYLINDER HEAD

Application In. (mm)
Cylinder Head Height 5.268-5.276 (133.81-134.01)
Maximum Warpage .004 (.10)
Valve Seat Contact Angle 45°
Valve Guides
Valve Guide I.D. .2366-.2374 (6.009-6.029)
Valve Guide Installed Height (1) .720-.744 (18.28-18.89)
Valve Stem-To-Guide Oil Clearance
Intake .0010-.0024 (.025-.060)
Exhaust .0012-.0026 (.030-.065)
Maximum Wear Limit .008 (.20)
Cylinder Head-To-HLA Clearance .0010-.0071 (.025-.180)
(1) Valve guide installed height is measured from top of installed guide to spring seat. See Figure.
VALVES & VALVE SPRINGS

Application Specification In. (mm)
Valves
Face Angle 45°
Contact Width .031-.055" (.79-1.40)
Installed Height (1)
Normal 1.772-1.791" (45.00-45.50)
Serviceable 1.733-1.772" (45.60-46.50)
Minimum Margin
Intake .035" (0.9)
Exhaust .039" (1.0)
Minimum Refinish Length
Intake 3.952" (100.39)
Exhaust 3.956" (100.49)
Stem Diameter
Intake
Standard .2350-.2356" (5.970-5.985)
Minimum .2331" (5.920)
Exhaust
Standard .2348-.2354" (5.965-5.980)
Minimum .2329" (5.952)
Valve Springs
Free Length 1.821" (46.26)
Maximum Out-Of-Square .064" (1.62)
Compressed Length (Minimum)
1.8L DOHC (1) 1.555" (39.50)
(1) Valve height is measured from top of installed valve to spring seat. See VALVE INSTALLED HEIGHTS  table under OVERHAUL. See Figure.
CAMSHAFT

Application In. (mm)
End Play .0032-.0120 (.081-.305)
Journal Diameter 1.0213-1.0222 (25.940-25.965)
Maximum Journal Out-Of-Round .0015 (.038)
Maximum Journal Runout .0012 (.030)
Journal Oil Clearance .0014-.0032 (.035-.081)
Maximum Wear Limit .006 (.15)
Lobe Height
Standard
Intake 1.7360 (44.094)
Exhaust 1.7560 (44.600)
Minimum
Intake 1.7281 (43.894)
Exhaust 1.7480 (44.400)