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V10 Engine Specifications
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Engine Type	488 cid 90' V-10 OHV
Bore & Stroke	4.00 x 3.88 in. (101.6 x 98.6 mm.)
Displacement	488 cu.in. (8.0 L)
Compression Ratio	8.4 :1
Horsepower	310 hp @ 4100 rpm
Torque	450 ft. lbs. (617 N.m) @ 2400 rpm
Firing Order	1-10-9-4-3-6-5-8-7-2
Lubrication	Pressure Feed - Full Flow Filtration  (Direct Crankshaft Driven Pump )
Engine Oil Capacity	7.0 Qts. (6.6 L)
Cooling System	Liquid Cooled - Forced Circulation
Cooling Capacity	21.75 Qts. (20.5 L)
Cylinder Block	Cast Iron
Crankshaft	Nodular Cast Iron
Cylinder Head	Cast Iron
Combustion Cambers	Wedge - High Swirl
Camshaft	Nodular Cast Iron
Pistons	Cast Aluminum Alloy
Connecting Rods	Forged Steel

General engine notes:

    The 8.0L 488 CID ten cylinder engine is a V-type, lightweight, single cam, overhead valve engine with hydraulic roller tappets. This engine is designed to run on unleaded fuel with a minimum octane rating of 87. Engine lubrication system consists of a rotor type oil pump mounted in the timing chain cover and gear driven by the camshaft. Oil is pumped through a full flow oil filter and feeds a main oil gallery, which then feeds oil to the main, rod and camshaft bearings . Passages in the cylinder block feed oil to the hydraulic lifters, which then suppl;y oil to the rocker arms through hollow pushrods. The cylinders are numbered from from to rear, with cylinders 1, 3, 5, 7, 9 on the left side and 2, 4, 6, 8, 10 on the right side.
    Cast iron alloy heads are held in place by 12 bolts. The spark plugs are located in the peak of the wedge between the valves.
    Die cast magnesium valve covers reduce noise and provide a better sealing surface.  The valve cover gasket is reusable.  Valves are arranged in-line and and inclined 18 degrees. Rocker pivot supports and valve guides are cast integral with the heads.
   Pistons are elliptically turned so that the diameter of the pin boss is less than the diameter across the thrust face. This allows for expansion under normal operating conditions. When the piston warms to operating temperature, expansion forces the the pin bosses away from each other, causing the piston to assume a more nearly round shape. All pistons are machined to the same weight regardless of size, to maintain piston balance. The piston pin is pressed into the connecting rod. All pistons have a special dry film coating baked onto the piston skirts to reduce friction.
    The multi-point fuel injection system consists of an electric fuel pump, fuel pressure regulator, and fuel filter, all mounted in the fuel tank; fuel tubes/lines/hoses between the tank and engine; fuel rail on the engine; fuel injectors on the intake manifold; accelerator pedal and throttle cable assembly. A separate fuel return line from the engine to the fuel tank is not used on the V-10. The fuel tank features a pressure relief/rollover valve and a pressure/vacuum fuel filler cap.  Also considered part of the fuel system is the evaporative emission control system, which is designed to reduce fuel vapor emissions from the fuel system.

PCM operation

    The PCM monitors various input signals from engine sensors, and then feeds its response to the engine control devices.  The PCM operates in two modes: Open Loop and Closed Loop.  

• During open loop operation, the PCM receives input signals and responds according to preset PCM programming. Input from O2 sensors is ignored.
• During closed loop operation, the PCM monitors O2 sensor signals and adjusts the injector puls based on the response from the O2 sensors. The PCM attempts to maintain the ideal 14.7:1 air/fuel ration by fine tuning fuel injection. Thisproduces the best fuel economy and lowest emissions for a given engine load.

    The fuel injection has these operating modes:

• Ignition switch ON - open loop
• Engine crank (start-up) - open loop
• Engine warm-up - open loop
• Idle - closed loop
• Cruise - closed loop
• Acceleration - open loop
• Deceleration - open loop
• Wide open throttle (WOT) - open loop
• Ignition switch off

Last Update: June 19, 2001