Ford Sigma engine

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1.7L Zetec-S VCT in a 1999 Ford Puma

The Ford Sigma is a small straight-4 automobile engine sold by Ford Motor Company as the "Zetec-SE" and renamed Duratec[1] and by Mazda as the "MZI". The engine was introduced in the mid-1990s and production continues through the present. Like the SHO V6 and SHO V8, the Sigma was designed with help from Yamaha. Intended for Ford's smaller models, it was intended to replace the older HCS and smaller capacity CVH units.

The Zetec-SE has no common parts or design with the larger Zetec-E engines apart from the name. This gives rise to some confusion since it suggests that they are members of the same family, but are in fact, completely different. Zetec-E units are mounted transversely with the inlet manifold at the rear, whereas the Zetec-SE units are mounted with the inlet manifold at the front, and obviously the exhaust at the rear.

Contents

[edit] Introduction and Innovations

When the Zetec-SE first arrived in 1995 it included many firsts, such as a plastic inlet manifold, a "ladder" style main bearing and crankcase assembly, and big-end bearing caps which are forged in one piece and subsequently split. It also incorporates powder metal connecting rods, which were quite exotic and notable at the time. The engine first appeared in the Mk4 Ford Fiesta and the virtually identical Mazda 121 in 1.25L (1242cc) capacity, with 1.4 L (1388cc), 1.6 L (1596cc) and 1.7 L (1679cc) derivatives coming later.

[edit] Zetec-SE

Code Years Displacement (bore x stroke)/Type Power@rpm torque@rpm Compression (:1)
1.25 Duratec? 2008- 1,242 cc (1.242 L; 75.8 cu in) (71.9 mm (2.83 in)x76.5 mm (3.01 in)) I4 60 PS (44 kW; 59 hp)@ 109 N·m (80 lb·ft)@ 10?
1.25 Duratec? 1995- 1,242 cc (1.242 L; 75.8 cu in) (71.9 mm (2.83 in)x76.5 mm (3.01 in)) I4 75 PS (55 kW; 74 hp)@6000 110 N·m (81 lb·ft)@4000 10
1.25 Duratec? 2008- 1,242 cc (1.242 L; 75.8 cu in) (71.9 mm (2.83 in)x76.5 mm (3.01 in)) I4 80 PS (59 kW; 79 hp)@ 114 N·m (84 lb·ft)@ 10?
1.4 Duratec? 1998- 1,388 cc (1.388 L; 84.7 cu in) (76 mm (3.0 in)x76.5 mm (3.01 in)) I4 75 PS (55 kW; 74 hp)@ 124 N·m (91 lb·ft)@ 10.3?
1.4 Duratec? 2002- 1,388 cc (1.388 L; 84.7 cu in) (76 mm (3.0 in)x76.5 mm (3.01 in)) I4 80 PS (59 kW; 79 hp)@5700 124 N·m (91 lb·ft)@3500 10.3?
1.4 Duratec? 1995- 1,388 cc (1.388 L; 84.7 cu in) (76 mm (3.0 in)x76.5 mm (3.01 in)) I4 90 PS (66 kW; 89 hp)@ 125 N·m (92 lb·ft)@ 10.3
1.4 Duratec? 2008- 1,388 cc (1.388 L; 84.7 cu in) (76 mm (3.0 in)x76.5 mm (3.01 in)) I4 96 PS (71 kW; 95 hp)@ 125 N·m (92 lb·ft)@ 10.3?
1.6 Duratec? 1998- 1,596 cc (1.596 L; 97.4 cu in) (79 mm (3.1 in)x81.4 mm (3.20 in)) I4 100 PS (74 kW; 99 hp)@6000 145 N·m (107 lb·ft)@4000 11
1.6 Duratec? 2004- 1,596 cc (1.596 L; 97.4 cu in) (79 mm (3.1 in)x81.4 mm (3.20 in)) I4 100 PS (74 kW; 99 hp)@6000? 150 N·m (110 lb·ft)@4000 11?
1.6 Duratec Ti-VCT? 2004- 1,596 cc (1.596 L; 97.4 cu in) (79 mm (3.1 in)?x81.4 mm (3.20 in)?) I4 115 PS (85 kW; 113 hp)@6000 155 N·m (114 lb·ft)@4150 11?
1.6 Duratec Ti-VCT? 2008- 1,596 cc (1.596 L; 97.4 cu in) (79 mm (3.1 in)?x81.4 mm (3.20 in)?) I4 120 PS (88 kW; 120 hp)@ 152 N·m (112 lb·ft)@ 11?
1.6 Duratec Ti-VCT? 2007- 1,596 cc (1.596 L; 97.4 cu in) (79 mm (3.1 in)?x81.4 mm (3.20 in)?) I4 125 PS (92 kW; 123 hp)@6300 160 N·m (120 lb·ft)@4100 11?
1.7 Duratec VCT? 1997- 1,679 cc (1.679 L; 102.5 cu in) (80 mm (3.1 in)x83.5 mm (3.29 in)) I4 126 PS (93 kW; 124 hp)@6300 157 N·m (116 lb·ft)@4500 10.3
1.7 Duratec VCT? 1999- 1,679 cc (1.679 L; 102.5 cu in) (80 mm (3.1 in)x83.5 mm (3.29 in)) I4 155 PS (114 kW; 153 hp)@7000 162 N·m (119 lb·ft)@4500 10.3?

The original 1,388 cc (1.388 L; 84.7 cu in) engine was rated 90 PS (66 kW; 89 hp) and 125 N·m (92 lb·ft), but tougher emissions laws meant the output was reduced to 80 PS (59 kW; 79 hp)@5700rpm and 124 N·m (91 lb·ft)@3500rpm beginning with the 2002 Ford Fiesta.

The 1,596 cc (1.596 L; 97.4 cu in) Ti-VCT (Twin independent Variable Camshaft Timing) version includes variable valve timing, and generates more power and torque over non-VVT counterparts.

The 1,679 cc (1.679 L; 102.5 cu in) engines uses a heavily modified 1.6 L engine block and features Variable Cam Timing on the inlet camshaft. This displacement has only been used in Ford Puma.

[edit] Crate engine versions

Crate engine versions of Zetec-SE engines are sold by Ford Power Products under the name ZSG Range.

Code Years Displacement (bore x stroke)/Type Power@rpm torque@rpm Compression (:1)
ZSG 414 ?- 1,388 cc (1.388 L; 84.7 cu in) (76 mm (3.0 in)x76.5 mm (3.01 in)) I4 75 PS (55 kW; 74 hp)@5700 124 N·m (91 lb·ft)@3500 11
ZSG 416 ?- 1,595 cc (1.595 L; 97.3 cu in) (79 mm (3.1 in)x81.4 mm (3.20 in)) I4 100 PS (74 kW; 99 hp)@6000 146 N·m (108 lb·ft)@4000 11

[edit] Applications

Engine type ratings vehicles
1,242 cc (1.242 L; 75.8 cu in) I4 60 PS (44 kW; 59 hp), 109 N·m (80 lb·ft)
75 PS (55 kW; 74 hp)@6000, 110 N·m (81 lb·ft)@4000
80 PS (59 kW; 79 hp), 114 N·m (84 lb·ft)
1,388 cc (1.388 L; 84.7 cu in) I4 75 PS (55 kW; 74 hp), 124 N·m (91 lb·ft)
80 PS (59 kW; 79 hp)@5700, 124 N·m (91 lb·ft)@3500
90 PS (66 kW; 89 hp), 125 N·m (92 lb·ft)
96 PS (71 kW; 95 hp), 125 N·m (92 lb·ft)
1,596 cc (1.596 L; 97.4 cu in) I4 100 PS (74 kW; 99 hp)@6000, 145 N·m (107 lb·ft)@4000
100 PS (74 kW; 99 hp)@6000?, 150 N·m (110 lb·ft)@4000
1,596 cc (1.596 L; 97.4 cu in) I4 Ti-VCT 115 PS (85 kW; 113 hp)@6000, 155 N·m (114 lb·ft)@4150
120 PS (88 kW; 120 hp), 152 N·m (112 lb·ft)
125 PS (92 kW; 123 hp)@6300, 160 N·m (120 lb·ft)@4100
1,679 cc (1.679 L; 102.5 cu in) I4 VCT 126 PS (93 kW; 124 hp)@6300, 157 N·m (116 lb·ft)@4500
155 PS (114 kW; 153 hp)@7000, 162 N·m (119 lb·ft)@4500
  • 1999-2002 Ford Racing Puma 1.7

[edit] See also

[edit] References

  1. ^ Fuel, performance and emissions Ford Fiesta, Ford.co.uk, 21 April 2009.
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