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Haynes Owner's Workshop Manuals (commonly known as Haynes Manuals) is a series manuals from the British and American publisher Haynes Group Limited. The series focuses primarily on the maintenance and repair of vehicles. The manuals are aimed at beginner and advanced DIY consumers rather than professional
A uniflow engine is a piston engine where gas flow through the cylinder proceeds in a single unidirectional flow, without reversals between strokes. This gives thermodynamic advantages as each group of ports can stabilise at an equilibrium temperature, rather than being alternately heated and cooled.
Complete power assembly replacements, where all of the assemblies in an engine are replaced, are least common and are normally done as part of a comprehensive engine overhaul. In a normal in-service power assembly replacement situation, the replacement will follow an inspection of the engine specifically performed to find internal engine failures.
In sidevalve engines the head is a simple plate of metal containing the spark plugs and possibly heat dissipation fins. In more modern overhead valve and overhead camshaft engines, the head is a more complicated metal block that also contains the inlet and exhaust passages, and often coolant passages , Valvetrain components, and fuel injectors .
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. Ports can be modified for maximum power, minimum fuel consumption, or a ...
A crossflow head gives better performance than a Reverse-flow cylinder head (though not as good as a uniflow), but the popular explanation put forward for this — that the gases do not have to change direction and hence are moved into and out of the cylinder more efficiently — is a simplification since there is no continuous flow because of valve opening and closing.
A crossflow T-head sidevalve engine The usual L-head arrangement Pop-up pistons may be used to increase compression ratio Flathead with Ricardo's turbulent head. A flathead engine, also known as a sidevalve engine [1] [2] or valve-in-block engine, is an internal combustion engine with its poppet valves contained within the engine block, instead of in the cylinder head, as in an overhead valve ...
Harley-Davidson Panhead engine at the Harley-Davidson Museum Harley-Davidson panhead motor Replicas of the Captain America bike and Billy Bike at the Harley-Davidson Museum in Milwaukee [1] The Panhead is an overhead-valve Harley-Davidson motorcycle engine , so nicknamed because the rocker covers resembled cooking pans.