1993 CADILLAC ELDORADO compression ratio

Downloaded from www.Manualslib.com manuals search engine The Northstar engine is designed to require less maintenance than many
other
DOHC V-8 engines. Engine systems are designed to remind the
driver when service is required. An oil life index indicator monitors
ongoing operating conditions and reminds the driver when
an oil change
is needed. A low coolant warning message keeps track
of the level of this
vital fluid. Direct acting hydraulic tappets provide maintenance free zero
lash operation
of the 32 valves from idle to the 6500 rpm redline. The
camshafts are driven by a
two stage roller chain assembly which is
designed to provide quiet maintenance free operation. Platinum tipped
spark plugs increase the replacement interval to
100,000 miles.
The four valve per cylinder design provides more
efficient engine
breathing which results
in higher power than comparable two valve
engines. The central location
of each spark plug ensures a fast and
complete burning
of the fuel/air mixture. The induction system uses
smooth thermoplastic tubes to channel air into the cylinders. The
smoothness
of the tubes is equivalent to the elaborate port polishing
methods used for race car engines. Careful design using the shape and
length
of the tubes boosts horsepower by using sonic pressure waves
created by the motion
of the inlet valves to increase the amount of air
entering each cylinder.
The Northstar engine
is also designed to be very durable. The aluminum
block has cast-in-place iron cylinder liners for greater wear resistance.
High strength forged steel connecting rods support the free floating \
piston pins
in bronze bushings for superior high speed performance. The
fillits
of the nodular iron crankshaft undergo a high pressure compression
rolling operation to improve their resistance to fatigue.
Quiet operation
is enhanced by the use of special materials and designs.
The front cover of the engine is stamped from laminated steel which
damps
out noise. Special cam cover gasket seals isolate valve train
operation. The
fuel injectors are placed inside the induction system
housing
to eliminate the clicking noise which is common to other fuel
injected engines.
The Northstar engine is designed
to provide years of efficient, reliable,
satisfying operation. We think
it is also just plain fun to drive.
337

Downloaded from www.Manualslib.com manuals search engine The cast aluminum pistons use two compression rings and one oil control
ring. The pistons are tin plated to provide a non-scuffing surface when
the engine is new.
A steel camshaft is supported by five steel backed babbit bearings. It is
driven by the crankshaft through a chain at the front of the engine. The
drive gear is keyed to the crankshaft and the driven sprocket is bolted to
the camshaft. Both the crankshaft gear and camshaft sprocket have
locating marks to provide the correct valve timing and timing chain
installation. The valve lifters are roller hydraulic type and are positioned
in the aluminum lifter carrier.
4T80-E Transaxle (ETC) & 4.6 L Sport Coupe (270 hp)
The 4T80-E transaxle has been designed to complement the output
characteristics
of the Northstar engine. The innovative design
incorporates several features which enhance its overall operation.
339

Downloaded from www.Manualslib.com manuals search engine n
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The power rack and pinion steering system,has a rotary spool valve which
directs hydraulic fluid coming from the power steering pump
to one side
or the other side
of the rack piston. The integral rack piston is attached to
the rack. The rack piston converts hydraulic pressure
to a linear force
which moves the rack left or right. The force
is then transmitted through
the inner and outer tie rods to the steering knuckles, which turn the
wheels
If hydraulic assist is not available, manual control is maintained. However
under these conditions more steering effort
is required.
4.6 LITER NORTHSTAR ENGINE
Displacement ............................... .4.6L (279 cu.in.)
No. of Cylinders ................ 32-valve DOHC 8 - 90 Degree V
Power (ACC. to SAE 51349) ............... 295 (bhp @ 6000 rpm
Torque
(ACC. to SAE 51349) ............ 290 (lbs. ft. @ 4400 rpm
..................................... 393 (Nm @ 4400 rpm
Power (ACC.
to SAE 51349) ............... 270 (bhp @ 6000 rpm
Torque (ACC.
to SAE 51349) ............ 207 (lbs. ft. @ 4400 rpm
Bore
........................................ 93mm (3.66 in.)
Stroke
...................................... .84mm (3.31in.)
Compression Ratio
................................... 10.3:l
Cylinder Heads
............................... Cast Aluminum
Intake Manifold
........................ Die Cast Magnesium /
.......................... Thermoplastic Air Induction Tubes
Valve System
................... Direct Acting Hydraulic Tappets
Exhaust Valve
................................ 29mm (1.14 in.)
Firing Order
.................................. 1-2-7-3-4-5-6-8
Engine Code 9
..................................... 220 (kW 1 @ 6000 rpm
..................................... 204(kW 1 @ 6000rpm
..................................... 300 (N-m 1 @ 4400 rpm
1
Engine Code Y:
Cylinder Block ...... Die Cast Aluminum with Iron Cylinder Bores
Intake Valve
.................................. 33mm (1.29 in.)
Pistons
...................................... Cast Aluminum
Left Bank
.......................................... 2-4-6-8
345

Downloaded from www.Manualslib.com manuals search engine Right Bank ......................................... 1-3-5-7
Camshaft ................... Induction Hardened Cast Grey Iron
Drive 5pe
........ Single Row / Staged Drive S mm Roller Chain
Main Bearings
......................................... Five
4.9 LITER ENGINE
Displacement ............................... .4.9L (300 cu.in.)
No. of Cylinders .............................. 8 - 90 Degree V
Power (Acc.
to SAE 51349) ............... 200 (bhp) @ 4100 rpm
Torque (ACC. to SAE 51349)
............ 275 (lbs. ft. @ 3000 rpm
Bore
....................................... 92mm (3.623 in.)
Stroke
..................................... 92mm (3.623 in.)
Compression Ratio
.................................... 951
Cylinder Block
........................... Die Cast Aluminum
Cylinder Block Bore Liners
......................... Cast Iron
Cylinder Head
.................................... Cast Iron
Intake Manifold
.............................. Cast Aluminum
Valve System
.......................... Roller Hydraulic Lifters
Intake Valve
................................ 45mm (1.772 in.)
Exhaust Valve
............................... 3Smm (1.496 in.)
Pistons
...................................... Cast Aluminum
Firing Order
.................................. 1-8-4-3-6-5-7-2
Left Bank
.......................................... 1-3-5-7
Right Bank
......................................... 2-4-6-8
Camshaft
............................................. Steel
Width..
.................................... 16.2mm (0.64 in.)
Pitch
...................................... 12.7mm (0.50 in.)
Drive Type
.......................................... Chain
Crankshaft
............................. Pearlitic Nodular Iron
MainBearings
........................................... 5
..................................... 250 (kW) @ 4100 rpm
..................................... 375 (N-m @ 3000 rpm 1
346
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