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A straight plug (or no-flare plug) is a typical-looking cylinder, without flares, and is kept in place by sliding o-rings against both ends of the plug. A grooved plug is a variation on the straight plug, with grooves carved in the material to hold the o-rings snug.
Most modern engines with a "straight" (inline) layout today use a single cylinder head that serves all the cylinders. Engines with a "V" layout or "flat" layout typically use two cylinder heads (one for each cylinder bank ), however a small number of 'narrow-angle' V engines (such as the Volkswagen VR5 and VR6 engines) use a single cylinder ...
The engine did not use a typical coil-on-plug design, but rather two coil+igniter assemblies mounted near cylinder four, and provided spark via normal high-tension cords (spark plug wires). This change means that the 1997-01 Camry 5S-FE has a blocked off distributor mounting hole and could be used with older 5S-FEs without swapping cylinder heads.
The heads are manufactured from either forged steel, cast iron, die-cast aluminium, die-cast zinc, or plastic. Aluminium and zinc heads are cheaper than steel and iron, but less durable and more prone to inaccuracy. [5] Cast iron and steel heads are also notably heavier. The heads are usually painted except for the flat machined reference faces.
Cylinder head porting refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve their air flow. Cylinder heads , as manufactured, are usually suboptimal for racing applications due to being designed for maximum durability.
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This design also relocated the water outlet from the front of the heads to the top center of the heads. These, designated V8-78, were offered with standard 6.2:1 compression aluminum or 7.5:1 compression iron cylinder heads , rated at 85 hp (63 kW) and 144 lb⋅ft (195 N⋅m) (aluminum) or 94 hp (70 kW) (iron). [ 19 ]
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