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Hydraulic tappets (along with rockers, valves and cylinder head) for a 1980-1985 Ford CVH engine. A hydraulic tappet, also known as a "hydraulic valve lifter" and "hydraulic lash adjuster", contains a small hydraulic piston that becomes filled with pressurised engine oil.
An asymmetric cam either opens or closes the valves more slowly than it could, with the speed being limited by Hertzian contact stress between curved cam and flat tappet, thereby ensuring a more controlled acceleration of the combined mass of the reciprocating componentry (specifically the valve, tappet and spring).
A hydraulic tappet, also known as a hydraulic valve lifter or hydraulic lash adjuster, is a device for maintaining zero valve clearance in an internal combustion engine. Conventional solid valve lifters require regular adjusting to maintain a small clearance between the valve and its rocker or cam follower. This space prevents the parts from ...
The 1.8 L CVH was only used in the European Ford Sierra. Bore is the same 80 mm (3.15 in) as the 1.6 L CVH, but a different crankshaft with a stroke of 88 mm (3.46 in) raises displacement to 1,769 cc (108.0 cu in). The cylinder head is equipped with hydraulic roller camshaft followers to reduce noise.
These engines also included cast-aluminum flat-top pistons, stiffer valve springs, a high-performance hydraulic camshaft, and a squarebore Autolite 4300-A carburetor. [1] The 1970 engines had an advertised 11.0:1 compression ratio and were rated at 300 bhp (224 kW; 304 PS) at 5400 rpm.
The engines all employ hydraulic tappets which operate in aluminum guides that are machined into the crankcase. The tappets are built from four parts, a cam follower body, cup, cylinder, and piston and operate with clearances of 0.03 in (1 mm) to 0.11 in (3 mm). The pushrods are steel and feature pressed-in ball ends. [1]
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