FACTOID # 178: There are more known reptile species in Australia than in all other listed countries combined.
 
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Encyclopedia > Lifter
For the ionic propulsion device, see Lifter (ionic propulsion device).

Piston engines

In piston engines, a lifter, cam follower, or tappet is a device that actuates a poppet valve through rocker arms and pushrods. Cam followers are needed to transfer the radial forces caused by the rotating cams on the camshaft to the engine block, leaving only an axial force on the pushrod.


Use of Hydraulic lifters eliminates the need to regularly adjust the valve play, but can be inefficient. Solid lifters are used in performance applications.


In engineering, lifter has some unrelated meanings.


  Results from FactBites:
 
American AntiGravity - Lifter 4 Antigravity Prototype 2 (825 words)
Upward-bowing of the chassis of the Lifter 4 was unexpected, due to the structural reinforcements that we added during construction.
The increased thrust is distributed evenly across the Lifter, but has a normal additive effect on the center of the Lifter that causes upward bowing in the structure.
The Lifter 4 uses slightly more current than the Lifter 3 does -- when powered by the 100kV Hvolt 100 power supply, the current draw for the Lifter 4 is between 3.5 and 4 milliamps -- for the Lifter 3 the current draw is between 2 and 3.5 milliamps.
The Lifters Experiments home page by Jean-Louis Naudin (453 words)
The Lifter works without moving parts, flies silently, uses only electrical energy and is able to lift its own weight plus an additional payload.
experiment, that a Lifter can be scaled up and also that such a device is able to lift 60 g of payload.
The Lifter has been fully tested by the [dstl], a part of the British Ministry of Defence
  More results at FactBites »


 

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