Technical Data: Engine

Christie's 1961 Oldsmobile Dynamic 88

Technical Data: Engine

Our thanks to Glenn in Florida for this picture.

1961 394ci Rocket Engine

1961 Oldsmobile 88-S88-98 Engine Specifications

CYLINDER BLOCK	SPECS
Engine Type No. of Cylinders Bore and Stroke Piston Displacement Compression Ratio: Regular Fuel Premium Fuel Firing Order Cylinder Identification: Left Bank (Front to Rear) Right Bank (Front to Rear)	90deg V-Type 8 4.125in x 3.6875in 394.1ci -- 8.5:1 10.0:1 1-8-7-3-6-5-4-2 -- 1-3-5-7 2-4-6-8
CRANKSHAFT	SPECS
Diameter-Main Bearing Width-Main Bearing Journal, Incl. Fillets: Center>No. 1 Nos. 2,3 and 4 No. 5 Diameter-Connecting Rod Bearing Journal Width-Conecting Rod Bearing, Incl. Fillets Length-Overall Crankshaft Dia-of Oil Holes in Crankshaft No. of Counterweights Clearance-Crankshaft End Thrust	2.999in-3.000in -- 1.090in 1.00in 1.880in 2.4992in-2.5002in 1.877in-1.880in 26.066in .201in-.209in 6 .004in-.008in
CRANKSHAFT SPROCKETS	SPECS
Width Pitch No. of Teeth	.520-.530in .500in 18
FLYWHEEL	SPECS
No. of Teeth on Starter Gear No. of Teeth on Starter Pinion	176 9
PISTONS	SPECS
Length Overall Length from Top of Piston to Pin Center Clearance (at Thrust Surface) Selective Diameter-Nominal Outside Weight-less Pins and Rings	4.050in 1.770-1.773in .0075-.00125in 4.125 27.761 oz.
PISTON PINS	SPECS
Diameter (Selective) Length Overall Diametrical Clearance (selective) Plain Boss	.9807-.9803in 3.126in .0003-.0005in. Loose
PISTON RINGS	SPECS
No. of Compression Rings Width, Compression Ring Top Width, Compression Ring, Bottom Gap Clearance Compression Rings Clearance in Groove, Compression Rings No. Oil Rings Width, Oil Ring Assembly: Perfect Circle Sealed Power Gap Clearance, Oil Ring Clearance-Oil Ring to Piston Groove	2 .0775-.0780in .0925-.0935 .013-.023 .001-.004 1 -- .1831-.1889in .1840-.1890in .015-.055in .0005-.007in
CONNECTING RODS	SPECS
Length-Center to Center Daimeter-Connecting Rod Bore Diameter-Pin Bore Clearance-Crankshaft(vertical) Clearance-Crankshaft (Horizontal) Clearance-Pin to Rod Clearance-End to Crankshaft	6.996-7.000in 2.6245-2.6250in .9807-.9811in .0005-.0026in .0013-.0034 .0003-.0005in. Loose .002-.011in
CAMSHAFT	SPECS
Bearing Journal Diameters All Width, Incl. Chamfers: Nos 1 and 5 Nos. 2, 3 and 4 Journal Clearance in Bushing Diameter-Reamed Bushing (all) Length- Bushing End Thrust	1.9977-1.9985in -- .781 .699 .0010-.0033in 1.9995-2.001 .688 Block and Spring Loaded Plunger
CAMSHAFT SPROCKET	SPECS
Width Pitch No. of Teeth	.520-.530 .500 36
TIMING CHAIN	SPECS
Width Length No. of Links Pitch	27/32in. 24in. 48 .500in.

VALVES
INTAKE SPECS
Diameter- Heads
Diameter- Stem
Angle- Valve Seat
Width- Valve Seat
Lift:
Premium Fuel
Regular Fuel
Clearance in Guide
Lash
1.870-1.880 in.
3.427-.3432 in.
45deg.
.037-.075
--
.427
.427
.0011-.0025
Hydraulic

EXHAUST SPECS
Diameter-Head
Diameter-Stem
Angle-Valve Seat
Width-Valve Seat
Lift
Clearance in Guide
Lash
1.557-1.567 in.
.3940-.3945 in.
45 Deg.
.037-.075
.432 in.
.0015-.003 in.
Hydraulic
VALVE SPRINGS SPECS
No. of Coils
Length-Free
Diameter-Wire
Diameter-Inside Top
Diameter-Outside Bottom
Pressure and Length:
Valve Open
Valve
6.40-6.60
2.25
.190-.194
.760
1.472-1.496
--
175-189 lbs. @ 1.437in.
85-95 lbs. @ 1.837 in.
VALVE LIFTERS SPECS
Diameter-Body:
Standard
.001in Oversize
.010 in. Oversize
Length-Overall
Clearance in Boss Selective
--
.9210-.9215 in.
.9220-.9225 in.
.9310-.9315 in.
2.125 in
.0005-.002 in.
VALVE GUIDES SPECS
Height from top of Head
Diameter-Inside Intake
Diameter-Inside Exhaust
Length-Overall
.787 in.
.3442-.3452 in.
.3960-.3970 in.
2.390 in.

LUBRICATION SYSTEM SPECS

Capacity- Engine:
Crankcase Only, Drain and Refill
Drain and Refill w/Filter Change
Oil Pump:
Clearance-Pressure Relief Valve in Bore
Clearance- End Caps
Width- Pump Gears
--
4 Qts.
5 Qts.
--
.0025-.005 in.
.0025-.008 in.
1 1/2 in.
COOLING SYSTEM SPECS
Radiator-Make
Capacity:
For Heater, Add
For Air Conditioning, Add
Pressure Cap
Thermostat
Harrison
19 1/4Qts.
1 Qt.
1 3/4Qt.
15 lbs.
170deg.

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This site updated 02June2005