(03-04 SVT Cobra) - 03 Cobra engine Specs - FFCars.com : Factory Five Racing Discussion Forum
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Old 01-12-2008, 08:46 PM   #1 (permalink)
SuperCobra 1
 
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Join Date: Mar 2002
Location: San Diego, CA.
Posts: 14,689
(03-04 SVT Cobra) - 03 Cobra engine Specs

specs on the 03 Cobra Motor:

Engine
Displacement 4.6L (4V) (281 CID)
Number of cylinders 8
Bore 90.2 mm (3.55 in)
Stroke 90.0 mm (3.54 in)
Firing order 1-3-7-2-6-5-4-8
Oil pressure 138-310 kPa
Oil capacity 6 ± 0.25 a
Compression ratio 8.5:1
Cylinder Head and Valve Train
Cylinder head gasket surface flatness 0.10 mm (0.004 inch) max. overall
Combustion chamber volume 52.6 ± 0.5 cm
Valve arrangement (front to rear) b
Intake (left hand): S-P-S-P-S-P-S-P
Valve arrangement (front to rear)
Exhaust (left hand): E-E-E-E-E-E-E-E
Valve arrangement (front to rear)
Intake (right hand): P-S-P-S-P-S-P-S
Valve arrangement (front to rear)
Exhaust (right hand): E-E-E-E-E-E-E-E
Valve guide bore diameter —
Valve stem diameter—intake 6.975-6.995 mm (0.2754-0.2746 inch)
Valve stem diameter—exhaust 6.949-6.970 mm (0.2744-0.2736 inch)
Valve stem-to-guide clearance—intake 0.020-0.069 mm (0.00078-0.00272 inch)
Valve stem-to-guide clearance—exhaust 0.046-0.094 mm (0.0018-0.0037 in)
Valve head diameter—intake 37 mm (1.46 inch)
Valve head diameter—exhaust 30 mm (1.18 inch)
Valve face runout 0.05 mm (0.002 in)
Valve face angle 45.5 degrees
Valve seat width—intake 1.8-2.2 mm (0.071-0.086 inch)
Valve seat width—exhaust 1.8-2.2 mm (0.071-0.086 inch)
Valve seat runout 0.05 mm (0.002 inch)
Valve seat angle 45 degrees
Valve spring free length—intake 42.16 mm (1.6598 inch)
Valve spring free length—exhaust 42.16 mm (1.6598 inch)
Valve spring squareness —
Valve spring compression pressure—intake 711.47 N @ 26.19 mm (159.9 lb-ft @ 1.031 inch)
Valve spring compression pressure—exhaust 711.47 N @ 26.19 mm (159.9 lb-ft @ 1.031 inch)
Valve spring installed height—intake —
Valve spring installed height—exhaust —
Valve spring installed pressure—intake 289.1 N @ 36.14 mm (64.99 lb-ft @ 1.4228 inch)
Valve spring installed pressure—exhaust 289.1 N @ 36.14 mm (64.99 lb-ft @ 1.4228 inch)
Roller follower ratio 1.8:1
Hydraulic Lash Adjuster
Diameter 16.000-15.988 mm (0.6299-0.6294 inch)
Clearance-to-bore 0.018-0.069 mm (0.000709-0.002717 inch)
Service limit 0.016 mm (1.0006299 inch)
Hydraulic leakdown rate c 5-25 seconds
Collapsed lash adjuster gap 0.80-1.20 mm (0.0315-0.0472 inch)
Camshaft
Theoretical valve lift @ 0 lash—intake (primary and secondary) 10.0 mm (0.3937 inch)
Theoretical valve lift @ 0 lash—exhaust 10.0 mm (0.3937 inch)
Lobe lift —
Allowable lobe lift loss —
Journal diameter 26.962-26.936 mm (1.0615-1.0605 inch)
Camshaft journal bore inside diameter —
Camshaft journal-to bearing clearance 0.025-0.076 mm (0.00098-0.002992 inch)
Runout —
End play 0.025-0.165 mm (0.00098-0.00649 inch)
Cylinder Block
Cylinder bore diameter 90.2-90.239 mm
Cylinder bore maximum taper 0.016 mm
Cylinder bore maximum out-of-round 0.016 mm
Main bearing bore diameter 72.402-72.422 mm
Head gasket surface flatness 0.15 mm (0.006 in) max. overall
Crankshaft
Main bearing journal diameter 67.493 mm
Main bearing journal maximum taper 0.05 mm
Main bearing journal maximum out-of round 0.05 mm
Main bearing journal-to-cylinder block clearance 0.023-0.055 mm
Connecting rod journal diameter 56.866-56.886 mm
Connecting rod journal maximum taper —
Connecting rod journal maximum out-of-round —
Crankshaft maximum end play 0.130-0.301 mm
Thrust bearing journal diameter 67.493 mm
Thrust bearing journal maximum out-of round 0.05 mm
Thrust bearing journal maximum taper 0.05 mm
Thrust bearing journal length 17.725-17.775 mm
Piston and Connecting Rod
Piston diameter 90.180-90.191 mm
Piston-to-cylinder bore clearance -0.010/+0.026 mm
Piston ring end gap — compression (top) 0.30 mm
Piston ring end gap — compression (bottom) 0.50 mm
Piston ring end gap — compression (oil ring) 0.65 mm
Piston ring groove width — compression (top) 1.53-1.549 mm
Piston ring groove width — compression (bottom) 1.519-1.539 mm
Piston ring groove width — oil ring 3.031-3.055 mm
Piston ring width — compression (top) 1.47-1.49 mm
Piston ring width — compression (bottom) 1.47-1.49 mm
Piston ring width — oil ring 2.854-2.984 mm
Piston ring-to groove clearance — compression (top) 0.04-0.079 mm
Piston ring-to groove clearance — compression (bottom) 0.029-0.069 mm
Piston ring-to groove clearance — oil ring 0.047-0.201 mm
Piston pin bore diameter 22.0042-21.998 mm
Piston pin diameter 21.991-29.994 mm
Piston pin length 61.60-62.03 mm
Piston pin-to-piston fit 0.0058-0.0132 mm
Connecting rod-to-pin clearance 0.018-0.033 mm
Connecting rod pin bore diameter 22.012-22.024 mm
Connecting rod length 150.7 mm
Connecting rod maximum allowed bend 0.038 mm per 25 mm
Connecting rod maximum allowed twist 0.050 mm per 25 mm
Connecting rod bearing bore diameter 56.866-56.886 mm
Connecting rod bearing-to-crankshaft clearance 0.027-0.069 mm
Connecting rod side clearance 0.15-0.45 mm

a With installation of a new filter.
b P=Primary, S=Secondary, E=Exhaust
c Time necessary for plunger to leak down 1.6 mm of travel with 222 N force and leak down fluid in tappet.

Coolant Type
Motorcraft Premium Engine Coolant VC-4-A (in Oregon VC-5, in Canada CXC-10) (green color) ESE-M97B44-A
Motorcraft Premium Gold Engine Coolant VC-7-A in (Oregon VC-7-B) (yellow color) WSS-M97B51-A1
Radiator Cap Pressure Test Specifications 110 kPa (16 psi)
Thermostat Opening Temperatures
Starts to open (Cobra) 80-83°C (175-182F°)
Fully open 104°C (219F°)

Generator
4.6L, 4V 4G HO 120 amps @ 6,000 pulley rpm (2.87:1 ratio) internal regulator

Engine Ignition
Ignition timing 10 degrees BTDC ± 2 degrees non-adjustable
Firing order 1-3-7-2-6-5-4-8
Spark plug gap mm (in) 1.32-1.42 (0.052-0.056)
Spark plug type AWSF-32EE

Manual Transaxle/Transmission — T56
Preload
Input/output shaft preload 0.0 mm (in) - 0.05 mm (0.002 in)
Countershaft cluster gear preload 0.0 mm (in) - 0.05 mm (0.002 in)
Countershaft extension preload 0.05 mm (in) - 0.13 mm (0.005 in)
Fluid
DEXRON III® (ATF) Transmission Fluid
XT-2-QDX DEXRON III®
Capacity 3.9 L (4.1 qt.)
Synchronizer
Synchronizer blocking ring to conical face runout
1st, 2nd, 3rd, 4th, 5th & 6th gear 0.38 mm (0.01 in)
Synchronizer blocking ring to conical face runout
Reverse gear 0.75 mm (0.03 in)

Rear Drive Axle/Differential — Ford 8.8-Inch IRS
Capacity
Additive Friction Modifier 118 ml (4 oz)
Rear axle lubricant 1.23-1.37 liters (2.6-2.9 pints)
Rear axle lubricant level 6.35 mm (1/4 inch) from the bottom of the fill hole
Clearance, Tolerance and Adjustments
Maximum carrier spread 0.762 mm (0.030 in)
Maximum differential ring gear backface runout 0.076 mm (0.003 in)
Maximum differential case runout 0.076 mm (0.003 in)
Backlash between differential ring gear and pinion teeth 0.203 mm (0.008 in)-0.330 mm (0.013 in)
Preferred backlash 0.254 mm (0.010 in)
Maximum backlash variation between teeth 0.1016 mm (0.004 in)
Maximum radial runout of rear axle pinion flange in assembly TIR 0.254 mm (0.010 in)
Available drive pinion bearing adjustment shim in steps of: 0.0254 mm (0.001 in) 0.254 mm (0.010 in)-0.965 mm (0.038 in)
Lubricant deflector to differential housing cover 5.08 mm (0.200 in)-6.35 mm (0.250 in)

SERGIO
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