Ford Sigma engine

福特Sigma发动机

Introduced in 1995, the Ford Sigma is a small straight-4automobileengine sold by Ford Motor Company. First evolution of engines were sold as the "Zetec-SE" (although frequently badged as Zetec-S, not to be confused with the trim level). After the upgrade Ford renamed Sigma to Duratec.^[1] Last upgrade of engine is named Duratec Ti-VCT. 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 (a derivative of the even older Kent unit) and smaller capacity CVH units.

1995年，福特开发的小型4缸汽车发动机。第一代发动机是以Zetec-SE的名义销售的。在升级之后，福特将Sigma发动机重新命名为Duratec。最近一次的升级发动机名字是Duratec Ti-VCT。这款发动机是在90年代中旬开发的发动机上一直改进至今的。像SHOV6和SHOV8发动机一样，Sigma发动机的设计得到了Yamaha的帮助（Yamaha是小排量汽油机的牛X厂啊！！！）。为福特的更小车型做准备，Sigma的研发是为了替代更老的HCS发动机和产能更小的CVH发动机。

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.

Zetec-SE发动机与Zetec-E发动机除了名字类似之外，并没有什么通用的零件。这引起了一些困惑，因为它表明他们是同一家庭的成员，但事实上，完全不同。Zetec-E系列都是反置式发动机（进气歧管在发动机后方），而Zetec-SE系列则是前置式发动机（进气歧管在发动机前方）。

Introduction and Innovations

简介

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.

当Zetec-SE于1995年第一次面世，她创造了很多第一次，例如：塑料进气歧管，阶梯式主轴承和曲轴箱组件，连杆轴承盖是整体锻造随后分离的。她还集成了粉末冶金制成的连杆，这是当时相当异乎寻常和值得人们注意的技术。这款发动机首次出现在福特嘉年华MK4（第四代嘉年华）和与其几乎相同的马自达121上，排量为：1.25L，并派生出1.4L，1.6L和1.7L不同排量的发动机。

Difference between Zetec-SE/Zetec-S/Duratec/Duratec Ti-VCT

Zetec-SE/Zetec-S/Duratec/Duratec Ti-VCT的不同之处

• 1.6-Litre-Duratec-Engine with TI-VCT in a 2012 Ford Focus

上图便是新福克斯上的1.6L Duratec TI-VCT发动机

Sigma engined is introduced under Zetec-SE name, after the upgrade it was renamed to Duratec. Latest upgrade of Sigma is called Duratec Ti-VCT.

Sigma发动机曾经命名为Zetec-SE，在升级后，她改名为Duratec。最近一次升级后她被称为：Duratec Ti-VCT

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. Latest versions comply with the EU5 emission level.

1.6L排量Ti-VCT(双独立可变凸轮轴正时)版本包含可变气门正时技术，能比同类非VVT发动机提供更高的功率和更大的扭矩。最近的版本能达到欧Ⅴ排放标准。

上表中红色部分就是我们现在用的1.6L发动机的来历。2008年开始在蒙迪欧（欧版）上使用。

Current Use

现在的使用情况

Today Sigma engine is used by Focus, Fiesta, C-Max and Mondeo.

现在，Sigma发动机搭载在福克斯，嘉年华，C-Max和蒙迪欧上。

1.25/1.4/1.6 L Sigma

These engines in the First generation Focus produced 75 and 100 bhp (75 kW; 101 PS) respectively, but for MkII Focus the 1.4 variant was slightly modified and produced 80 bhp (60 kW; 81 PS). Both engines have belt driven camshafts and Electronic Fuel Injection systems. They weight 90 kilograms. [1][2] The 1.6 Ti-VCT is introduced in 2004, it which features Variable Cam Timing; this 115 bhp (86 kW; 117 PS) version is used in MkII Focus. A new 105/125 bhp EU5 version is used in the MkIII Focus, also a 1.6 L 120 hp (89 kW) version is used in Ford Fiesta Zetec-S. Sigma uses the Ford IB5 5-speed transmission.

1.25/1.4/1.6L Sigma

这些发动机在第一代福克斯上产生75KW的动力，但是福克斯MK2（第二代福克斯）的1.4升发动机略有改动，可以提供80匹马力。这两个发动机都是皮带驱动和电子燃油喷射系统的。他们总重90KG。1.6 Ti-VCT于2004年引进，这款发动机具有可变凸轮正时，这款86KW的版本在福克斯MK2上使用。一个新的105/125马力欧5排放标准的版本在福克斯MK3（新福克斯）上使用，也有一个1.6L 89KW的版本用于福特嘉年华 Zetec-S上。Sigma匹配福特IB5五前速变速箱（变速箱都是世界同步滴！福特不坑爹！）。

Ford Sigma 1.6-litre overview Technical features:

福特Sigma 1.6L技术特点

• High level of running refinement and low emission levels

• 高运转精度和低排放等级

• Aluminium alloy cylinder block and head

• 全铝合金构造

• Cross flow cylinder head

• 横流式缸盖

• Structural aluminium oil-pan for increased engine stiffness

• 发动机油底壳结构铝增加刚度

• Twin overhead camshafts each with five bearings

• 双顶置凸轮轴每轴五个轴承

• Sequential multi-port fuel injection system

• 顺序多点燃油喷射系统

• Long life, glass fibre reinforced camshaft drive belt with automatic tensioner

• 长寿命玻璃纤维增强凸轮轴传动皮带及自动张紧器

• State-of-the-art Twin Independent Variable Camshaft Timing (on Ti-VCT variant)

• 先进的双独立可变凸轮轴正时（在ti-vct上）

全文OVER。

希望这篇译文能给大家一个交代。