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Two piston rings mounted on a two-stroke engine piston. The ring gap for the bottom ring is visible in the centre of the image. A piston ring is a metallic split ring that is attached to the outer diameter of a piston in an internal combustion engine or steam engine. The main functions of piston rings in engines are:
The 4.7-liter version was the first of this family, appearing in the 1999 Jeep Grand Cherokee.The displacement is 4.7 L; 286.7 cu in (4,698 cc) with a bore and a stroke of 3.66 in × 3.405 in (93.0 mm × 86.5 mm).
The pistons have three rings and smaller piston pins. [1] [2] A75-1 A75-2 A75-3 A75-4 A75-5 A75-6 A75-14 A80 80 hp (60 kW), Compression ratio 7.55:1, max rpm 2,700, fuel consumption at cruise 5.2 US gph. The connecting rods have a 0.125 in (3 mm) hole drilled in the rod cap to improve lubrication. The pistons have five rings and smaller piston ...
Piston Rings End gap, .011 in. to .016 in. Vertical play, .001 in. and .002 in. on scraper. ... Spec Make Type Bore Block Main Pilot Slide Cut-away Jet Groove Note
The Toyota E engine family is a straight-four piston engine series, and uses timing belts rather than chains. The E engines were the first multi-valve engines from Toyota designed with economy, practicality and everyday use in mind (rather than performance).
The RE also has an unusual coolant distribution manifold. The RE's designers retained the valve angles and sizes, pent-roof combustion chambers, dual chain-driven camshafts, and stock piston crown shapes of the production Quad 4. [13] The RE is a wet sleeve design, with four cast iron cylinder liners attached to an upper cylinder block deck ...
The head itself was flat with each engine capacity (1.1 and 1.3 L (1,098 and 1,298 cc)) featuring different pistons with different sized bowls in 681F and 711M blocks. The 1.6 L (1,599 cc) 691M block had the stronger 'square' bearing caps later used in the 711M, and small combustion chambers in the near-flat head (the bulk of the volume being ...
For the 1999 model year all pistons were totally redesigned. Both engines used the flat top pistons with 2 valve recesses and featured a new hypereutectic design with coated skirts. Also for 1999 all connecting rods switched to a slightly longer powder forged design and cracked bearing caps. The piston pins floated in the connecting rod bushings.