Question:
When someone says that there engine is a "stroked 350" what does the stroked part mean? Does it have something to do with the cam shaft, or the roller rockers? Please answer, and please help! All answers are appreciated and will be read, please no uneducated guesses!Thanks.
Answers:
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The longer stroke produces more power than a stock stroke. The piston can pull in more fuel, because it travels farther down in the cylinder than stock. The extra fuel, when burned, exerts more force on the piston. In turn, the piston has a longer "arm" to turn the crankshaft, because the stroke is bigger. This generates even more torque for a given RPM and compression ratio.
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If the piston is travelling farther, why doesn't it pop out of the block? The stroker engines require special pistons or rods to keep the deck height the same. Deck height is the distance between the top of piston and block deck at TDC. The closer to 0, the better. Its called "zero deck".
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So when the crank stroke is at TDC, the piston is even with the block. This is done by using custom pistons that move the pin location on the piston, or using shorter rods. The piston is even with the block at TDC, and travels farther down the cylinder at BDC due to the longer stroke.
The common stroker crank to use with a 350 is a 400 SBC crank, which has a 3.75" stroke. This results in a 383 cubic inch engine.
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So if somebody says they have a stroker motor, ask them what the new stroke is. If they say a 400 crank, or 3.75" stroke, they may be telling the truth.
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Engine volume is calculated by bore multiplied by stroke. Bore is the diameter of the piston, and stroke is the distance the piston travels from top dead center to bottom dead center. When the engine is stroked, the crankshaft has been modified to produce a longer stroke to either produce more compression or to produce greater volume.Happy Motoring
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the first answer is a good answercrankshaft is changed and rods are longer to add length to travel of pistons giving more combustion area and horsepower. Hope this helps
When referring to a stroked engine one is usually saying that they have changed the length of the piston rods. By using a shorter rod this gives the cylinder more space thus increasing the cubic inches of cylinder displacement. Often a stroked 350 or a stroker has been increased to 383 cubic inches.
stroking is not only modding the crank, but using a different (shorter) lenght piston rod is the most common (and easiest) way to increase the cylnder volume. the new geomerty also gives a major torque increase.
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Stroking is a reference to a stroked crankshaft, ( one with longer stroke )A 350 has a factory stroke of 3.5 inches.
An example would be to put a crank with a 3.6 inch stroke in.
Coupled with a .030 overbore would = 367 cubic inches.
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electron is exactly right. usually a 350 stroker is a 350 with a 400 crank. you used to have to do some modifying, but now they sell complete balanced kits, rods pistons crank balancer flex, for under 1000 bucks.More Questions & Answers ...
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