specifications for the 848cc engine
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engine number prefix 8mb/8yuh/8amu
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for identifying other engine numbers go to |
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Engine Type 848cc
| DOME type welch plugs x 4 (S) cam follower covers
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Bore
| 2.478"
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Stroke
| 2.687"
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capacity of combustion chamber
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b.m.e.p.
| 128 lb/sq" 2900 rpm
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Bhp
| 34 bhp @5500 rpm
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Torque
| 44 ft/lb @2900
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Fuel System
| leaded
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Compression Ratio
| 8.3:1
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Firing Order
| 1 3 4 2
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Valve Clearance (Inlet)
| .012" thou hot
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Valve Clearance (Exhaust)
| .012" thou hot
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Cylinder Head Tension
| 42 ft/lb *
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Conrod Bolt Tension
| 35 ft/lb
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Main Bearing Tension
| 60 ft/lb
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Crankshaft Pulley Tension
| 70 ft/lb
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Flywheel Tension
| 150 ft/lb
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Points Gap
| .015"
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Dwell Angle in degrees
| 60 + or - 5
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Spark Plug Type / Gap
| bp5es ngk w8dc bosch .025"
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Ignition Timing ( max total mech #30)distributor mechanical advance and vacuumonly
| 0-10 degrees BTDC (depends on fuel/comp ratio and distributor curve)
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CO % (at idle)
| 3%
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Oil Capacity
| 5 litres incl filter
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Oil Filter (Industry Number)
| early R2180p mid R2200p screw on z418
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Oil Type / Grade
| 20w/50 sg
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Recommended Service Interval
| 3000 miles/ 5000 km
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Crankshaft main journal dia
| 1.7505"-1.751" (44.46mm-44.47mm)
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Main bearings running clearance
| .001"-.0027"
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Connecting rods little end size
| .625"
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Gudgeon pin clamp in rod
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Piston rings
| width comps..062"" x 3 oil .125" end gaps on comp .008"-.015"
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Valves
| inlet head dia 1.093" exhaust 1.000"
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Cam timing using .019" tappet clearance
| inlet opens 5# btdc inlet closes 45#abdc
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exhaust opens 40# bbdc exh closes 10#atdc
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| Valve springs free length
| 1.625" 4-1/2 coils
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Oil pressure normal running
| 60 lb/in (4.2 kg/cm2
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carburettor needle 1-1/4" su hs2
| std eb rich m lean gg
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Gearbox ratios standard ratio
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helical gears top 1.0:1
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third 1.412:1
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second 2.172:1
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first 3.627:1
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reverse 3.627:1
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Overall gear ratios with 3.765 standard final drive ratio
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top 3.765
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third 5.317
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second 8.176
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first/reverse 13.657
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