BMW 630CS - ENGINE

84
Specifications
ENGINE
Design
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and inclined valves in triple-herrisphere
swi rl -act i o n combustion chambers
designed to suìt ffle mìxture preparation
system in use.
lnstallation
inciined-àt 3o° to one side, over front
axle. Three-pojnt engine mountings: st
either side, \^fth rubber bushings close
to center of gravity and attached dìrectly
to front axle beam; a± rear. flanged to
gearbox, with single rubber mounting on
transmjssion cross-member.
Cylinder block
Special-g rade grey cast iron.
Cylinder head
Light alloy, with shrunk-in valve seat
rings and guides.
Crankshaft
Heat-treated steel forging, vrith 12 coun-
terweights; 7 three-layer main bearings
each with 2 oi 1 supply drillways.
Connectlng rod§ and pistons
Forged steel connecting rods with
replaceable three-layer bigend bear-
ings; pistons with raised flat crown and
chromium plated spheroidal graphite
cast upper rings.
Valves
Overhead, inclined in V-pattern in cylin-
der head to form a hemispherical
combustion chamber. Exhaust valve
armoured, with hard chromium plated
stem. Valve clearances adjustable at
eccentrics in rockers.
Valve gear
Light alloy rockers with chill-cast pads,
single overhead camshaft driven by
duplex roller chain with automatic oil-
damped chain tensioner and backlash
prevention.
Valve clearances
lnlet and exhaust 0.25 to 0.30 mm
(0.010-0.012 in), measured with engine
stopped and cold (max. coolant temper-
ature 35°C [95° F] ).
Valye timing (for test pu rposes)
Total opening .
period 248°
±2.50
Measured with 0.5 mm (0.02 in) clearance
bet`^reen rocker and cam base circle.
Lubrication
Pressurized oil circuit with full flow cl
filter and pressure regulating valve in
filtered oil circuit. Rotor oil pump (Eatcm
system) chain driven from crankshafL
Light alloy sump.
Oil consumption
Up to 0.15 Iiter/100 km (200-235 mikì/
pint).
011 fllter
Full flow filter with paper element anc
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Engine breather
Crankcase and valve cover linked by
passage in block and connected to a.r
cleaner and intake manifold (BMW
630 CS) or throttle stub pipe (BMW 633
Csj).
Air cleaner
One fi lter element in intake air silencer.