Ads
related to: mercury 90 hp 2 stroke runs rough low idle
Search results
Results From The WOW.Com Content Network
Idle speed, sometimes simply called "idle", is the rotational speed an engine runs at when the engine is idling, that is when the engine is uncoupled from the drivetrain and the throttle pedal is not depressed. In combustion engines, idle speed is generally measured in revolutions per minute (rpm) of the crankshaft.
Animation of a two-stroke engine. A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston (one up and one down movement) in one revolution of the crankshaft in contrast to a four-stroke engine which requires four strokes of the piston in two crankshaft revolutions to complete a power cycle.
These bore and stroke dimensions were later used by the 267 cu in (4.4 L) V8 Chevrolet engine. Also like the small block V8 engines, the 200 cu in (3.3 L) V6 used 2.45-inch (62.2 mm) main bearings and 2.1-inch (53.3 mm) rod bearing diameters. Being a 90° V6, Chevrolet took steps to eliminate the rough running tendencies of the 200.
90° V angle: This design historically derives from chopping two cylinders off a 90° V8 engine, in order to reduce design and construction costs. An early example is the 3.3 L (200 cu in) and 3.8 L (229 cu in) Chevrolet 90° V6 engines , which have an 18° offset crankshaft resulting in an uneven firing interval.
Diesel engine runaway is an occurrence in diesel engines, in which the engine draws extra fuel from an unintended source and overspeeds at higher and higher RPM, producing up to ten times the engine's rated output until destroyed by mechanical failure or bearing seizure due to a lack of lubrication. [1]
Four-stroking is a condition of two-stroke engines where combustion occurs every four strokes or more, rather than every two. Though normal in some instances at idle, extremely high engine speeds, and when letting off the throttle, such firing is uneven, noisy and may, in cases of malfunction, damage the engine if allowed to continue unabated.
By 1939, several two-stroke diesel types were in widespread use, and others were being developed for high-power applications,. [11] Of several two-stroke aircraft diesel engine concepts, the Junkers Jumo 205 was the only type to be made in significant quantities, with approximately 900 units in all. [12]
These range from 2-, 3-, and 4-cylinder models generating 15 to 135 horsepower (11 to 101 kW) suitable for hulls up to 17 feet (5.2 m) in length to powerful V6 and V8 cylinder blocks rated up to 627 hp (468 kW)., [2] with sufficient power to be used on boats of 37 feet (11 m) or longer.