Manufacturer:	Morgan					Class: C and E
Model:		Plus 4 (1957-1961)
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DESCRIPTION:
	2-Seater Steel-bodied Roadster
	Dry Weight: 
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ENGINE:	Type ..............	4 cyl ohv in line (TR3)
	Bore & stroke .....	83mm x 92mm (86mm x 92mm)
	Capacity ..........	1991 cc (2196 cc)
	Comp ratio ........	8.5:1, 9.2:1
	Head material .....	Cast Iron
	Port size .........	Intake-1.5", Exhaust-1.25"x1.06"
	Piston material ...	Aluminum Alloy
	Piston weight .....	22 oz complete
	Timing data:
		Intake ....	Open 15° BTDC, Close 55° ABDC
		Exhaust ...	Open 55° BBDC, Close 15° ATDC
				-or-
		Intake ....	Open 43° BTDC, Close 76° ABDC
		Exhaust ...	Open 76° BBDC, Close 43° ATDC
	Valve lift: .......	0.376" or 10.16mm
	Valve head dia:
		Intake ....	1-9/16"
		Exhaust ...	1-5/16"
	Valve spring ......	166 lbs open
	Carburation .......	Two SU H6
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TRANSMISSION AND DRIVE TRAIN:
	Ratios:	
		1	12.85	13.5
		2	7.38	8.0
		3	5.24	5.4
		4	3.73	4.1
		5
	Final drive ratios: 3.73, 4.1
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CHASSIS
	Wheelbase ...................	96"
	Track dimension, front ......	47"
	Track dimension, rear .......	47"
	Shock absorber ..............	
	Steering ratio ..............	1-3/4 turns
	Brakes ......................	
	Tire size ...................	5.00/5.25x16, 5.50x16, 
					5.60x15(wire wheels), 5.00x15
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APPROVED OPTIONAL EQUIPMENT (Allowed in both Class C and E)
	15" Dunlop wire wheels
	11" Disc brakes on front wheels
	Electric fuel pump (in addition to mechanical pump)
	Oversize liners (122166)
	Oversize pistons (122208)
	Cylinder head gasket (2054481)
	Bore becomes 86mm

APPROVED OPTIONAL EQUIPMENT (Only permitted in Class C, prohibited in class E)
	4 Branch exhaust system
	Special inlet manifold
	Aluminum sump
	Oil cooler
	High-lift camshaft
	Competition push rods
	Competition valve springs
	Aluminum bodywork (Dry weight becomes 1764 lbs)
	2 Weber 42 DCOE or 45 DCOE Carburators