How do engineers choos the Bore/Stroke ratio for a new engine??
some choose a long stroke, and others choose ashorter one...
based on what do they choose these specifications???
what are the advantages of the long stroke???
what are the advantages of the shorter strokes???
what about a square engine (B=S)???
why isnt it used in racing vehicles???
2007-01-09 10:45:56 · 4 answers · asked by Anonymous in Cars & Transportation ➔ Other - Cars & Transportation
Well they all stay around the same length and bore to get a certain Cubic Inch..... example.... Chevy made a 302 cubic inch engine in 1960 and 1970 only for the Camaro Z28.... Bore is 4.0 inches.... strike 3.0 inches. This gave the engine the ability to rev really high due to a short stroke, but attain high horsepower with a good size bore.
Advantages of long stroke- more torque, but engine revs lower, good for trucks.
Short stroke - Higher revs, god for racing and quick horsepower
Never heard of a square engine.....
2007-01-09 13:12:59 · answer #1 · answered by Anonymous · 0⤊ 0⤋
well a lot of Square engines are used in racing, most are European made and supercharged. Engineers have to figure out how to build an engine to fit into a specific space, horsepower, torque, drivability, and fuel mileage. Some like the Z28 were limited by the racing events. GTU, GTA, TRANS-AM, and SCCA events limit cubic inches or litres, Example--the Z28 was build to not exceed the 5 litre naturally aspirated limit (or 2.5 litre turbo/supercharged with boost limited to no more than 30 psi.) from the rules of the racing events. Longer stroke means more torque and longer burn allowing to use all the expanded gases to transfer their energy---but more rod mass causes lower max rpms for fear of throwing a rod, also slower acceleration of the engine. shorter stroke allows for faster acceleration of the engine, less torque, and expanding gases are not used efficiently.
2007-01-09 16:54:36 · answer #2 · answered by redrepair 5 · 0⤊ 0⤋
Bore is the inside diameter of the cylinder, stroke is the distance the head of the piston travels from top dead center to bottom dead center within the cylinder. The ratio is one measurement to the other. Most times, these values are very close, making it "square". When you hear of a cylinder design called "oversquare" that means the stroke is shorter than the cylinder is wide. The opposite is "undersquare".
2016-05-23 00:13:46 · answer #3 · answered by Anonymous · 0⤊ 0⤋
are you planning on becoming a engine engineer?
2007-01-09 11:03:50 · answer #4 · answered by ptcruisher2001 5 · 0⤊ 0⤋