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ENGINE TYPE |
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XPAG/TD up to Engine No 9407. |
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XPAG/TD/2 from Engine No. 9408. |
Number of cylinders |
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Four |
Capacity |
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1250 c.c. (761 cu. in.). |
B.H.P. |
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54.4 at 5,200 r.p.m. |
Bore |
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66.5 mm. (2.618 in.). |
Stroke |
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90 mm. (3.543 in.). |
R.A.C. rating |
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10.97 h.p. |
Compression ratio |
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7.25 to 1. |
System of cooling |
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Thermo-siphon-pump and fan assisted. |
Radiator hose top |
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Length 4in. (10.16cm.). |
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Diameter 2 3/16 in. (5.56 cm.). |
Radiator hose bottom |
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Length 2¼ in. (5.71 cm.). |
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Diameter 1 1/8 in. (2.86 cm.). |
First oversize bore |
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+ .020 in. (.50 mm.). |
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Actual bore 2.6381 in. (67 mm.). |
Second oversize bore |
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+.040 in. (1.00 mm.). |
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Actual bore 2.6581 in. (67.5 mm.). |
Firing order |
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1-3-4-2. |
Piston clearance at pressure face below oil ring |
.0021 in. to .0029 in. (.056 mm. to .071 mm.). |
Ring gap |
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.006 in. to .010 in. (.152 mm. to .254 mm.). |
Number of compression rings |
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Two. |
Width of compression rings |
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2.25 mm. (.0885 in.). |
Number of oil rings |
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One. |
Width of oil ring |
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4.0 mm. (.1575 in.). |
Oil pressure relief valve operates |
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50 to 70 lb. per sq. in. (3.5 to 5.0 kg./cm.²). |
Oil pressure (normal) |
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40 to 45 lb. per sq. in. (2.8 to 3.2 kg./cm.²). |
Gudgeon pin type |
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Clamped. |
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.7087 in. |
{+.0004 in. |
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{+.0006 in. |
Gudgeon pin diameter |
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18 mm. |
{+.015 mm. |
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{+.010 mm. |
Fit in piston |
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Double thumb press. |
Fit in connecting rod |
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Clamped. |
Crankpin diameter (standard) |
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1.772 in. (45 mm.). |
Crankpin minimum diameter for regrind |
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1.722 in. (43.75 mm.). |
Connecting rod-length between centres |
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7.008 in. (178 mm.). |
Connecting rod-type of bearing |
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Shimless, steel-backed, white-metal-lined. |
Connecting rod-side clearance |
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.004 in. to .006 in. (.10 mm. to .15 mm.). |
Connecting rod-diametrical clearance |
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.0005 in. to .002 in. (.011 mm. to .056 mm.). |
Number of crankshaft bearings |
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Three. |
Type of main bearings |
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Shimless, steel-backed, white-metal-lined. |
Standard main journal diameter |
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2.047 in. (52 mm.). |
Main journals first regrind diameter |
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2.027 in. (51.49 mm.). |
Main journals second regrind diameter (minimum) |
2.007 in. (50.98 mm.). |
Main bearings-length |
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Front 1.496 in. (38 mm.). |
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Centre 1.496 in. (38mm.). |
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Rear 1.575 in. (40 mm.). |
Centre main bearing-end clearance |
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.0014 in. to .0037 in. (.035 mm. to .095 mm.). |
Main bearings-diametrical clearance |
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.0008 in. to .003 in. (.020 mm. to .075 mm.). |
Crankshaft-end thrust taken on |
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Centre bearing. |
Number of camshaft bearings |
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Three |
Type of camshaft bearings |
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White metal (front). |
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Zinc alloy (rear and centre). |