Engine Mechanical Specifications. Pontiac Firefly (Canada) 1999

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 1999 🢒 Firefly (Canada) 🢒 Engine 🢒 Engine Mechanical - 1.3L 🢒 Engine Mechanical Specifications

Application	Specification
Application	Metric	English
General
Engine Type	L4
RPO Code	LY8
Displacement	1300 cc	79 CID
Bore	74.15 mm	2.919 in
Stroke	90 mm	3.54 in
Firing Order	1-3-4-2
Spark Plug Type-Denso	K20PR-U11
Spark Plug Type-NGK	BKR6E11
Spark Plug Gap	1.0-1.1 mm	0.039-0.043 in
Compression
Compression Pressure at 250 RPM (Standard)	1350 kPa	192 psi
Compression Pressure (Minimum)	1100 kPa	156 psi
Compression Pressure Difference Between Any Two Cylinders (Maximum)	100 kPa	15 psi
Engine Vacuum
Vacuum at 800 RPM at Sea Level	59.2-76.3 kPa	17.7-22.8 in Hg
Lubrication System
Oil Pressure (at 4000 RPM)	330-430 kPa	46.9-61.1 psi
Oil Capacity with Filter Change	3.3L	3.5L
Cooling System
Cooling System Capacity	5.0L	4.7 qt
Temperature at which Thermostat begins to Open	83°C	179°F
Temperature at which Thermostat Fully Open	95°C	203°F
Thermostat Valve Lift	More than 8 mm at 95°C (203°F
Radiator Cap Relief Valve Pressure	108 kPa	15.7 psi
Camshaft
Camshaft Intake Lobe Height (Standard)	36.171-36.331 mm	1.4241-1.4303 in
Camshaft Exhaust Lobe Height (Standard)	35.356-35.516 mm	1.4314-1.4376 in
Camshaft Intake Lobe Height (Minimum)	36.071 mm	1.4202 in
Camshaft Exhaust Lobe Height (Minimum)	36.256 mm	1.4275 in
Camshaft Runout (Maximum)	0.10 mm	0.0039 in
Camshaft Journal Clearance (Standard)	0.040-0.082 mm	0.0016-0.0032 in
Camshaft Journal Clearance Limit (Maximum)	0.12 mm	0.0047 in
Camshaft Journal Bore Diameter	28.000-28.021 mm	1.1024-1.1031 in
Camshaft Journal Outside Diameter	27.939-27.960 mm	1.1000-1.1008 in
Crankshaft
Crankshaft Runout	0.060 mm	0.0023 in
Crankshaft Thrust Play (Standard)	0.110-0.310 mm	0.0044-0.0122 in
Crankshaft Thrust Play (Maximum)	0.380 mm	0.0149 in
Crankshaft Out of Round	0.010 mm	0.0004 in
Crankshaft Taper	0.010 mm	0.0004 in
Crankshaft Journal Diameter 1 Stamping	44.994-45.000 mm	1.7714-1.7716 in
Crankshaft Journal Diameter 2 Stamping	44.988-44.994 mm	1.7712-1.7714 in
Crankshaft Journal Diameter 3 Stamping	44.982-44.988 mm	1.7709-1.7712 in
Crankshaft Journal Diameter for Reground Crankshaft	44.732-44.750 mm	1.7611-1.7618 in
Connecting Rods and Bearings
Connecting Rod Side Clearance (Standard)	0.10-0.20 mm	0.0039-0.0078 in
Connecting Rod Side Clearance (Maximum)	0.35 mm	0.0137 in
Connecting Rod Bow Limit	0.050 mm	0.0020 in
Connecting Rod Twist Limit	0.10 mm	0.0039 in
Connecting Rod Diameter Out-of-Round and Taper Limit	0.01 mm	0.0004 in
Connecting Rod Small End Diameter (Standard)	19.003-19.011 mm	0.7482-0.7486 in
Connecting Rod Big End Diameter (Standard)	41.982-42.000 mm	1.6528-1.6535 in
Connecting Rod Big End Diameter 0.25 mm (0.0098") Undersize	41.732-41.750 mm	1.6430-1.6437 in
Connecting Rod Bearing Clearance (Standard)	0.020-0.050 mm	0.0008-0.0019 in
Connecting Rod Bearing Clearance (Maximum)	0.080 mm	0.0031 in
Main Bearings (Standard Replacement Bearings)
Green	1.996-2.000 mm	0.0786-0.0787 in
Black	1.999-2.003 mm	0.0787-0.0788 in
Colorless (no paint)	2.002-2.006 mm	0.0788-0.0789 in
Yellow	2.005-2.009 mm	0.0789-0.0790 in
Blue	2.008-2.012 mm	0.0790-0.0791 in
Main Bearings--Oversized Replacement Bearings (0.25 mm - 0.0098"):
Green and Red	2.121-2.125 mm	0.0835-0.0836 in
Black and Red	2.124-2.128 mm	0.0836-0.0837 in
Red Only	2.127-2.131 mm	0.0837-0.0838 in
Yellow and Red	2.130-2.134 mm	0.838-0.0839 in
Blue and Red	2.133-2.137 mm	0.0839-0.0840 in
Main Bearing Clearance (Standard)	0.020-0.040 mm	0.0008-0.0016 in
Main Bearing Clearance (Maximum)	0.060 mm	0.0023 in
Main Bearing Cap Bore Diameter (Without Bearing) A Stamping	49.000-49.006 mm	1.9291-1.9294 in
Main Bearing Cap Bore Diameter (Without Bearing) B Stamping	49.006-49.012 mm	1.9294-1.9496 in
Main Bearing Cap Bore Diameter (Without Bearing) C Stamping	49.012-49.018 mm	1.9296-1.9298 in
Thrust Bearing Thickness (Standard)	2.500 mm	0.0984 in
Thrust Bearing Thickness (Maximum)	2.563 mm	0.1009 in
Cylinder Head
Cylinder Head Gasket Surface Distortion (Maximum)	0.05 mm	0.002 in
Cylinder Heat Seating Distortion Intake and Exhaust Manifolds (Maximum)	0.10 mm	0.004 in
Cylinder Block
Cylinder Block Gasket Surface Distortion (Standard)	0.03 mm	0.0012 in
Cylinder Block Gasket Surface Distortion (Maximum)	0.06 mm	0.0024 in
Cylinder Bore Stamped 1	74.01-74.02 mm	2.9138-2.9141 in
Cylinder Bore Stamped 2	74.00-74.01 mm	2.9134-2.9138 in
Cylinder Bore Diameter Limit	74.15 mm	2.9196 in
Taper and Out-of-Round Limits	0.10 mm	0.0039 in
Oil Pump
Oil Pump Rotor-to-Oil Pump Body Radial Clearance (Maximum)	0.310 mm	0.0122 in
Oil Pump Housing-to-Oil Pump Gear Set (Side Clearance) (Maximum)	0.15 mm	0.0059 in
Pistons
Piston-to-Cylinder Bore Clearance	0.02-0.04 mm	0.0008-0.0015 in
Piston Diameter Standard Stamp 1	73.980-79.990 mm	2.9126-2.9130 in
Piston Diameter Standard Stamp 2	73.970-73.980 mm	2.912-2.9126 in
Piston Diameter 0.25 mm (0.0098") Oversize Piston	74.220-74.230 mm	2.9220-2.9224 in
Piston Diameter 0.50 mm (0.0196") Oversize Piston	74.470-74.480 mm	2.9319-2.9323 in
Piston Ring End Gap Top Ring (Standard)	0.15-0.30 mm	0.0059-0.0118 in
Piston Ring End Gap Top Ring (Maximum)	0.7 mm	0.0275 in
Piston Ring End Gap Lower Ring (Standard)	0.2-0.35 mm	0.0079-0.0137 in
Piston Ring End Gap Lower Ring (Maximum)	0.7 mm	0.0275 in
Piston Ring End Gap Oil Ring (Standard)	0.2-0.6 mm	0.0079-0.0236 in
Piston Ring End Gap Oil Ring (Maximum)	1.7 mm	0.0669 in
Piston Ring Groove Clearance Upper Compression Ring	0.03-0.07 mm	0.0012z-0.0027 in
Piston Ring Groove Clearance Lower Compression Ring	0.02-0.06 mm	0.0008-0.0023 in
Piston Pin Diameter	18.997-19.000 mm	0.7479-0.7480 in
Piston Pin to Connecting Rod Clearance (Standard)	0.003-0.016 mm	0.0001-0.0006 in
Piston Pin to Connecting Rod Clearance (Maximum)	0.050 mm	0.0020 in
Rocker Arms
Rocker Arm to Shaft Clearance (Standard)	0.001-0.036 mm	0.0001-0.0014 in
Rocker Arm to Shaft Clearance (Maximum)	0.09 mm	0.0035 in
Rocker Arm Inside Diameter	15.985-16.005 mm	0.629-0.630 in
Rocker Arm Shaft Runout Limit	0.20 mm	0.008 in
Rocker Arm Shaft Diameter	15.969-15.984 mm	0.6287-0.629 in
Valves
Valve Guide Inside Diameter	5.485-5.510 mm	0.2159-0.2169 in
Valve Head Thickness Intake Valves (Standard)	0.8-1.2 mm	0.03-0.047 in
Valve Head Thickness Intake Valves (Minimum)	0.6 mm	0.024 in
Valve Head Thickness Exhaust Valves (Standard)	0.8-1.2 mm	0.03-0.047 in
Valve Head Thickness Exhaust Valves (Minimum)	0.7 mm	0.027 in
Valve Seating Contact Width Intake and Exhaust	1.1-1.3 mm	0.0433-0.0512 in
Intake Valve Stem Outside Diameter	5.465-5.480 mm	0.2152-0.2157 in
Exhaust Valve Stem Outside Diameter	5.440-5.455 mm	0.2142-0.2148 in
Intake Valve Stem Radial Runout (Minimum)	0.14 mm	0.005 in
Exhaust Valve Stem Radial Runout (Minimum)	0.18 mm	0.007 in
Intake Valve Stem-to-Valve Guide Clearance (Standard)	0.005-0.045 mm	0.0002-0.0018 in
Intake Valve Stem-to-Valve Guide Clearance (Maximum)	0.070 mm	0.0027 in
Exhaust Valve Stem-to-Valve Guide Clearance (Standard)	0.030-0.070 mm	0.0012-0.0027 in
Exhaust Valve Stem-to-Valve Guide Clearance (Maximum)	0.090 mm	0.0035 in
Valve Spring Free Length (Standard)	36.83 mm	1.4500 in
Valve Spring Free Length (Minimum)	35.67 mm	1.4043 in
Valve Spring Preload (Standard)	10.7-12.5 kg at 31.5 mm	23.6-27.5 lb. at 1.24
Valve Spring Preload (Minimum)	9.3 kg at 31.5 mm	20.5 lb. at 1.24
Valve Spring Squareness Deviation (Maximum)	2.0 mm	0.079 in
Valve Lash
Intake Valve Cold Valve Lash	0.13-0.17 mm	0.005-0.007 in
Exhaust Valve Cold Valve Lash	0.23-0.27 mm	0.009-0.011 in
Intake Valve Hot Valve Lash	0.17-0.21 mm	0.007-0.008 in
Exhaust Valve Hot Valve Lash	0.28-0.32 mm	0.011-0.013 in

Standard Main Bearing Selection Table

Letter on Lower Crankcase	Number on Crankweb
--	1	2	3
A	Green	Black	Colorless
B	Black	Colorless	Yellow
C	Colorless	Yellow	Blue