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The 1962 Glas 1004 was the first mass-produced vehicle to use a timing belt. The 1966 Pontiac OHC Six engine was the first US mass-produced vehicle to use a timing belt, [21] [22] while the 1966 Fiat Twin Cam engine was the first mass-produced engine to use a timing belt with twin camshafts. Carmakers began to adopt timing belts in the 1970s ...
For twin-cam or DOHC engines, VCT was used on either the intake or exhaust camshaft. (Engines that have VCT on both camshafts are now designated as Ti-VCT.↓) The use of variable camshaft timing on the exhaust camshaft is for improved emissions, and vehicles with VCT on the exhaust camshaft do not require exhaust gas recirculation (EGR) as retarding the exhaust cam timing achieves the same ...
The long stroke necessitated a raised engine block deck, a design also shared with later units. All 1.9s from 1989 on are equipped with a roller camshaft and roller lifters. The camshaft and water pump are driven by the timing belt. This engine is a non-interference design. Output is 86 hp (64 kW) and 100 lb⋅ft (136 N⋅m) with a carburetor.
SOHC design (for a 1973 Triumph Dolomite Sprint) . The oldest configuration of overhead camshaft engine is the single overhead camshaft (SOHC) design. [1] A SOHC engine has one camshaft per bank of cylinders, therefore a straight engine has a total of one camshaft and a V engine or flat engine has a total of two camshafts (one for each cylinder bank).
The camshaft is usually driven either directly, via a toothed rubber "timing belt"' or via a steel roller "timing chain". Gears have also occasionally been used to drive the camshaft. [15] In some designs the camshaft also drives the distributor, oil pump, fuel pump and occasionally the power steering pump.
The engine also received variable camshaft timing technology in some XR6 models, Fairlane/LTD models and the Fairmont Ghia which allowed the ECU to advance or retard camshaft timing depending on engine speed, which results in a broader power band. The Composite Headgasket from the previous models was replaced with a Multi-Layer-Steel (MLS) gasket.