Austin-Healey and other car things
Welcome to Austin-Healeys.com History Page
This is the 4th location of my website, but once I purchased this domain, I have had to move hostsOver the years, the site began as a general interest webpage covering many topics, and has been refined to become the home of my car hobby.Here are the address of the first three sites...One is still active, but points to this one- http://www.geocities.com/TheTropics/Shores/1256
(Started by May 1997 - left due to space restrictions)
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Austin Healey Sprite - M. G. Midget "A"-SERIES ENGINE DETAILS Dimensions are in inches unless otherwise stated. (information from SPRITE, MIDGET, 1958-71 AUTOBOOK, by Kenneth Ball, Autopress Ltd. 1971) |
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| Bore and Stroke (mm): | |||
| 948 cc | 62.94 X 76.20 | ||
| 1098 cc | 64.58 X 83.72 | ||
| 1275 cc | 70.61 X 81.28 | ||
| Compression ratio (low): | |||
| 948 cc ('Sprite' I and II, 'Midget' I) | 8.3:1 | ||
| 1098 cc ('Sprite' II and III, 'Midget' I and II) | 8.1:1 | ||
| 1275 cc ('Sprite' IV, 'Midget' III) | 8.0:1 | ||
| Compression ratio (high): | |||
| 948 cc ('Sprite' I and II, 'Midget' I) | 9.0:1 | ||
| 1098 cc ('Sprite' II and III, 'Midget' I and II) | 8.9:1 | ||
| 1275 cc ('Sprite' IV, 'Midget' III) | 8.8:1 | ||
| Firing Order | 1-3-4-2 | ||
| Main bearings, journal diameter: | |||
| All capacities except 'Sprite III and IV, 'Midget' II and III | 1.7505-1.7510 | ||
| 1098 cc and 1275 cc ('Sprite' III and IV, 'Midget' II and III) | 2.0005-2.0010 | ||
| Main bearing liners, running clearance | |||
| 948 cc ('Sprites' and 'Midgets') | .001 to .0025 | ||
| 1098 cc ('Sprites' and 'Midgets') | .001 to .0025 | ||
| 1275 cc ('Sprite' IV, 'Midget' III) | .001 to .0027 | ||
| Main Bearings, lining material | |||
| 'Sprite' I | Whitemetal | ||
| 948 cc ('Sprite' II and 'Midget' I) | Lead/indium | ||
| 1098 cc ('Sprites' and 'Midgets') | Lead/indium | ||
| 1275 cc ('Sprite' IV, 'Midget' III) | VP3 lead/indium or nfm/3B | ||
| Crankshaft regrind undersizes | |||
| 948 cc and 1098 cc | -.010, -.020, -.030, -.040 | ||
| 1275 cc | No more than >010 without heat treatment | ||
| Crankshaft end float (all Capacities) | .002 to .003 | ||
| Crankpin diameter (all capacities) | 1.6254 to 1.6259 | ||
| Connecting rod centers (all capacities) | 5.75 | ||
| Big-end bearings, running clearance (all capacities) | .001 to .0025 | ||
| Big-end bearings, lining material | Copper/lead | ||
| 948 cc ('Sprite' II and 'Midget' I) | Lead/indium | ||
| 1098 cc and 1275 cc ('Sprites' and 'Midgets') | Lead/indium | ||
| Connecting rod end float on crankpin (all capacities) | .008 to .012 | ||
| Clamped gudgeon pin: | |||
| Diameter | .6244 to .6246 | ||
| Clearance in piston | .0001 to .0003 | ||
| Fully floating gudgeon pin (fit in piston -1098cc) | Hand push | ||
| Gudgeon Pin (1275 cc) | |||
| Fit in small end (interference) | Pressed in small-end, .0008 to .0015 | ||
| Fit in piston | Hand push | ||
| Piston Type | Aluminum alloy | ||
| Standard piston, suitable bore size: | |||
| 948 cc | 2.4778 to 2.4781 | ||
| 1098 cc | 2.5424 to 2.5447 | ||
| 1275 cc | 2.7803 to 2.7800 | ||
| Piston oversizes: | |||
| 948 cc | +.010, +.020, +.030, +.040 | ||
| 1098 cc and 1275 cc | +.010 and +.020 | ||
| Piston clearance, bottom of skirt: | |||
| 948 cc ('Sprite' I) | .0010 to .0016 | ||
| 949 cc ('Sprite' II, 'Midget' I ) | .0016 to .0022 | ||
| 1098 cc | .0005 to .0011 | ||
| 1275 cc | .0015 to .0021 | ||
| Piston clearance, top of skirt: | |||
| 949 cc ('Sprite' II, 'Midget' I ) | .0036 to .0042 | ||
| 1098 cc | .0021 to .0037 | ||
| 1275 cc | .0029 to .0037 | ||
| Piston rings, compression: | |||
| Top | Plain | ||
| Second | Taper | ||
| Third | Taper | ||
| Fourth piston ring, all capacities except 1275 cc and later 1098cc | Slotted scraper | ||
| 1275 cc and later 1098 cc | Duraflex 61 | ||
| Width of compression rings: | |||
| 948 cc | .0690 to .0700 | ||
| 1098 cc (top ring) | .0620 to .0625 | ||
| 1098 cc (second and third rings), 1275 cc (all three) | .0615 to .0625 | ||
| Width of slotted scraper ring: | |||
| All capacities except 1275 cc and later 1098 cc | .124 to .125 | ||
| Ring gap, fitted, all capacities except 1275 cc | .007 to .012 | ||
| 1275 cc (top ring) | .011 to .016 | ||
| 1275 cc (second and third rings) | .008 to .013 | ||
| Duraflex 61 (rails and side spring) | .012 to .028 | ||
| Ring clearance in groove | |||
| 948 cc, 1275 cc (top, second and third) | .0015 to .0035 | ||
| 1098 cc | .0020 to .0040 | ||
| Camshaft journal diameters: | |||
| Front | 1.6655 to 1.666 | ||
| Center | 1.62275 to 1.62325 | ||
| Rear | 1.3725 to 1.3735 | ||
| Camshaft bearings: | |||
| Front | Steel-backed whitemetal | ||
| Center and rear ('Sprite' I) | Direct in crankcase | ||
| (All 'Sprites' and 'Midgets', except 'Sprite' I, have three whitemetalled bearing liners) | |||
| Camshaft clearance: | |||
| Front bearing (also center and rear when linered) | .001 to .002 | ||
| Center and rear bearings | .00125 to .00275 | ||
| Camshaft end float | .003 to .007 | ||
| Timing chain | Single roller (Duplex on 1275 cc) | ||
| timing chain, pitch | .375 | ||
| Timing chain, length | 52 pitches | ||
| Valve seat angle | 45 deg. | ||
| Valve lift: | |||
| 948 cc ('Sprite' I) | .285 | ||
| 949 cc ('Sprite' II, 'Midget' I ) | .312 | ||
| 1098 cc | .312 | ||
| 1275 cc | .318 | ||
| Valve head diameter, inlet: | |||
| 948 cc ('Sprite' I) | 1.0937 | ||
| 949 cc ('Sprite' II, 'Midget' I ) | 1.151 to 1.156 | ||
| 1098 cc | 1.151 to 1.157 | ||
| 1275 cc | 1.307 to 1.312 | ||
| Valve head diameter, exhaust | |||
| 948 cc ('Sprites' and 'Midgets') | 1.00 to 1.005 | ||
| 1098 cc | 1.00 to 1.005 | ||
| 1275 cc | 1.1515 to 1.1565 | ||
| Valve stem diameter, inlet: | |||
| 948 cc ('Sprites' and 'Midgets') | .2793 to .2798 | ||
| 1098 cc and 1275 cc | .2793 to .2798 | ||
| Valve stem diameter, exhaust (all capaciteis) | .2788 to .2793 | ||
| Valve stem clearence, inlet (all capacities) | .0115 to .0025 | ||
| Valve stem clearance, exhaust: | |||
| 948 cc and 1098 cc | .0020 to .0030 | ||
| 1275 cc | .0015 to .0025 | ||
| Valve rocker clearance (cold): | |||
| All capacities | 0.012 | ||
| Competition work | 0.015 | ||
| For checking timing only: | |||
| 948 cc ('Sprite' I) | 0.019 | ||
| 949 cc ('Sprite' II, 'Midget' I ) | 0.021 | ||
| 1098 cc | 0.021 | ||
| 1275 cc | 0.029 | ||
| Valve springs ---free length | |||
| 948 cc ('Sprite' I) | 1.750 | ||
| 948 cc ('Sprite' II, 'Midget' I ), inner | 1.672 | ||
| 950 cc ('Sprite' II, 'Midget' I ), outer | 1.750 | ||
| 1098 cc ('Sprites' and 'Midgets'), inner | 1.672 | ||
| 1098 cc ('Sprites' and 'Midgets'), outer | 1.750 | ||
| 1275 cc ('Sprite' IV, 'Midget' III), inner | 1.703 | ||
| 1275 cc ('Sprite' IV, 'Midget' III), outer | 1.828 | ||
| Valve spring pressure (valve closed): | |||
| 948 cc ('Sprite' I) | 52.5 lb | ||
| 948 cc ('Sprite' II, 'Midget' I ), inner | 18 lb | ||
| 950 cc ('Sprite' II, 'Midget' I ), outer | 52 lb | ||
| 1098 cc ('Sprites' and 'Midgets'), inner | 18 lb | ||
| 1098 cc ('Sprites' and 'Midgets'), outer | 52 lb | ||
| 1275 cc ('Sprite' IV, 'Midget' III), inner | 25 lb | ||
| 1275 cc ('Sprite' IV, 'Midget' III), outer | 51 lb | ||
| Valve timing ('Sprite' I): | |||
| Inlet opens | 5 deg. Before TDC | ||
| Inlet closes | 45 deg. After BDC | ||
| Exhaust opens | 40 deg. Before BDC | ||
| Exhaust closes | 10 deg. After TDC | ||
| With rocker clearance of .019, for checking only | |||
| Valve timing (948 cc 'Sprite' II and 'Midget' I. All 1098 cc and 1275 cc): | |||
| Inlet opens | 5 deg. Before TDC | ||
| Inlet closes | 45 deg. After BDC | ||
| Exhaust opens | 51 deg. Before BDC | ||
| Exhaust closes | 21 deg. After TDC | ||
| With rocker clearance of .021, for checking only (.029 for 1275 cc) | |||
| Oil sump capacity including filter (pints) --- all capacities | 6 1/2 | ||
| Oil pressure relief valve springs, free length: | |||
| 'Sprite' I | 2 7/8 | ||
| Later 'Sprites' and 'Midgets' | 2.86 | ||
| Oil pressure (normal running), lb/sq in: | |||
| All except 'Sprite' IV and 'Midget' III | 60 | ||
| 'Sprite' IV and 'Midget' III | 40 to 70 | ||
| Exhaust emission control | |||
| Exaust gas analyser reading: | |||
| At engine idling speed | 2 to 2.5% CO (provisional) | ||
| Air pump test speed | 1200 rev/min (engine) | ||
Austin Healey Sprite - M. G. Midget GEARBOX DETAILS (information from SPRITE, MIDGET, 1958-71 AUTOBOOK, by Kenneth Ball, Autopress Ltd. 1971)
| Oil capacity (pints) | 2 1/3 | |||||
| Gear Raitos (overall) | First | Second | Third | Top | Reverse | |
| Sprite I | 15.276 | 10.018 | 5.95 | 4.22 | 19.665 | |
| 948 cc Sprite II and Midget III | 13.504 | 8.085 | 5.726 | 4.22 | 17.361 | |
| 1098 cc and 1275 cc Sprites and Midgets | 13.504 | 8.085 | 5.726 | 4.22 | 17.32 | |
| Post 1969 models | 12.48 | 7.472 | 5.292 | 3.9 | 16.044 |
Austin Healey Sprite - M. G. Midget CRITICAL NUT & BOLT TORQUES Dimensions are in lbs/foot unless otherwise stated. (information from SPRITE, MIDGET, 1958-71 AUTOBOOK, by Kenneth Ball, Autopress Ltd. 1971)
| Cylinder head nuts (except Sprite IV and Midget III) | 40 | ||
| Sprite IV and Midget III (studs 22 or small indent) | 50 | ||
| Sprite IV and Midget III (plain studs) | 42 | ||
| Main bearing cap bolts | 60 | ||
| Big-end cap bolts (except Sprite IV and Midget III) | 35 | ||
| Sprite IV and Midget III | 45 | ||
| Crankshaft pulley nut | 70 | ||
| Gudgeon pin clamp screw | 25 | ||
| Flywheel bolts | 35 to 40 | ||
| Rocker pedestal nuts | 25 | ||
| Sump to crankcase bolts | 6 | ||
| Rocker cover bolts | 4 | ||
| Oil pump securing bolts (Sprite IV and Midget III) | 12 | ||
| Oil filter | 10 to 15 | ||
| Steering column pinch bolt (Sprite IV and MidgetIII) | 10 | ||
| Deep-pressed cylinder side cover (Sprites III and IV, Midgets II and III) | 5 | ||
| Steering wheel nut | 41 | ||
| Disc to hub | 40 to 45 | ||
| Caliper to hub | 45 to 50 | ||
| Steering column - top fixing bolts | 12 to 17 | ||
| pinion pinch bolt | 9 to12 | ||
| Steering wheel nut | 37 | ||
| Master cylinder port adaptors | 33 | ||
| Plastic reservoir fixing bolts | 5 | ||
| Pressure failure switch (nylon) | 15 lb in | ||
| Pressure failure switch assembly end plug | 200 lb in | ||
| Front hub nuts | 25 to 65 | ||
Austin Healey Sprite - M. G. Midget IGNITION SYSTEM DETAILS (information from SPRITE, MIDGET, 1958-71 AUTOBOOK, by Kenneth Ball, Autopress Ltd. 1971)
| Spark plug type all capacities cxcept Sprite IV and Midget III | Champion N5 | |
| Spark plug type (Sprite IV and Midget III) | Champion N9Y | |
| Spark plug gap | 0.025 | |
| Contact breaker gap | 0.014 | |
| Static setting, Premium fuel: | ||
| 948 cc (high compression) Sprite I | 5 deg. before TDC | |
| 948 cc (high compression) Sprite II and Midget I | 4 deg. before TDC | |
| 1098 cc (high copression) Sprite III and Midget II | 5 deg. before TDC | |
| 1275 cc (high comression) Sprite IV and Midget III | 7 deg. before TDC | |
| 1275 cc (Sprite IV and Midget III) Exhaust emission control | 4 deg. before TDC | |
| Static setting (low compression): | ||
| 948 cc (Sprite II and Midget I) | 1 deg. before TDC | |
| 1098 cc (Sprite III and Midget II) | 3 to 5 deg. before TDC | |
| 1275 cc (Sprite IV and Midget III) | 7 deg. before TDC | |
| Stroboscope setting at 600 engine rev/min: | ||
| 1098 cc (Sprite III and Midget II) | 8 deg. before TDC | |
| 1275 cc (Sprite IV and Midget III) at 1200 rev/min | 22 deg. | |
| Stroboscope setting at 1000 engine rev/min: | ||
| 1275 cc (Sprite IV and Midget III) Exhaust emission control | 10 deg. before TDC | |
| Distributor type (lucas) | ||
| Sprite I | D.M.2-P.H.4 | |
| 948 cc Sprite II and Midget I | D.M.2-P.4 | |
| 1098 cc and later 125 cc | 25 D.4 | |
| 1275 cc (early - no vacuum control) | 23 D.4 | |
| Coil type (Lucas): | ||
| All models except Sprtie IV and Midget III | L.A. 12 | |
| Sprite IV and Midget III | 11 C.12 | |
Austin Healey Sprite - M. G. Midget SU CARBURETOR DETAILS Dimensions are in inches unless otherwise stated. (information from SPRITE, MIDGET, 1958-71 AUTOBOOK, by Kenneth Ball, Autopress Ltd. 1971)
| Type (Sprite I) | SU H.1 (two) | |
| Needle (normal) | GG | |
| Type (Sprite II and Midget I, 948 cc) | SU H.S.2 (two) | |
| Needle (Standard) | V3 | |
| Needle (Rich) | V2 | |
| Needle (Weak) | GX | |
| Spring | Light Blue | |
| Type (1098 cc Sprite II and Midget I) | SU H.S.2 (two) | |
| Needle (Standard) | GY | |
| Needle (Rich) | GG | |
| Needle (Weak) | M | |
| Spring | Blue | |
| Type (1098 cc Sprite III, Midget II, 1275 cc Sprite IV, Midget III | SU H.S.2 (two) | |
| Needle (Standard) | AN | |
| Needle (Rich) | H6 | |
| Needle (Weak) | GG | |
| Spring | blue | |
| Spring (Sprite IV and Midget III) | Light Blue | |
| Fuel pump (all models except Sprite III and IV and Midget II and III) | AC 'Y' type (mechanical) | |
| Sprite III and IV, Midget II and III | SU type A.U.F. (Electric) | |
| Type (1275 cc Sprite IV, Midget III) Exhaust emission control | SU H.S.2 (two) | |
| Specification: Exhaust emission control: | ||
| Fixed needle type | AUD 266 | |
| Spring-loaded type | AUD 328 | |
| Needle, fixed type, exhaust emission control | AN | |
| Spring-loadaed type, exhaust emission control | AAC | |
| Piston spring, exhaust emission control | Blue | |
| Initial jet adjustment, exhausted emission control | 11 flats from bridge | |
| Idling speed, exhaust emission | 1000 rev/min | |
| Fast-idle speed, exhaust emission | 1100 to 1200 rev/min | |
