Torque is essentially the force which will move your vehicle forwards faster. This is why torque has always seen such huge popularity in the drag racing scene where off-the-line speed is essential. Stealthy, unsuspecting sleepers are awesome and this additional power is tucked away inside the motor — so no-one will suspect a thing! Well, provided you can keep quiet about it! Since we now know that a stroker will increase your engine displacement by providing additional length to the stroke of the piston.
A stroker kit will be compiled of engine components which have been uprated from OEM specifications to achieve the required stroke increase.
This will allow the piston to travel further inside the cylinder bore due to the use of a different crankshaft. The length of the journals along the crankshaft will be adjusted by the specified distance depending on the kit chosen. With the wrong parts or incorrect spacing, the piston is likely to hit the cylinder head, which will inevitably end in engine failure.
Firstly, a costly, or time-consuming option of doing it without a kit is to increase the height of the block deck or the cylinder cavity. If this choice is best for you, we would recommend attempting to purchase a specific aftermarket block deck which has been designed for the use of stroker kits.
CNC machining your own block is likely to be far more hassle and more expensive. Alternatively, you can shorten the connecting rod itself, or adjust the piston pin higher up the connecting rod. This would prevent the need for the complicated cylinder head or wall machining to allow for the increased stroke. We would personally opt for a tried and tested off-the-shelf kit.
As an example, a popular engine in drifting would be the SR20, and Tomei have created their own stroker kit which turns your 2. By utilizing forged pistons, forged full-counter crankshaft, and forged H-beam rods, the stroker kit is filled with all the best parts to greatly improve the bottom end.
The bigger the bore size, the higher the displacement. This Tomei kit and the related parts are designed for use on engines that will be outputting 1, HP at over 10, RPM. Pretty insane capabilities for an SR, right?! We would much prefer to go with a setup like this which has had proper tried and tested research development methods carried out to ensure the best results.
Take a look around this hp 2. Often used by the best drifters in the world, such as Daigo Saito, this kit will give you a whopping 3. Additional information:. Depending on bore size that you decide, the BC kit will take you up to a 3. As usual, each BC kit features custom CP aluminum forged pistons, alloy wrist pins and complete ring pack. Built for high horsepower and torque. Stroker kits also available with lightweight crank option -8 lbs and Carrillo rod option.
BC crankshafts are made from the finest, aerospace grade steel billet material. Every crankshaft features large radius journals that add rigidity for high horsepower, high boost, high rpm applications.
Gun drilled, CNC ground oil holes feature a smooth surface for extra oiling, tear dropped for added oil scoop, cross drilled for priority main feeding to the rods and micro polished to a mirror finish for optimum bearing lubricity. All cranks are stress relieved, shot peened, magna flux inspected and nitrided multi step heat treatment for ultimate performance. The math is a little more complex but it basically stems from the fundamental moment equation where torque is equal to force multiplied by the perpendicular distance to the pivot.
Increasing this distance increases the torque and is what a stroker kit does. To increase the length of stroke basically means changing many key engine components. Firstly, a custom crankshaft is fitted with shorter rod journals. Then custom rods and pistons with higher gudgeon pin locations are fitted.
Entire kits are usually available from trusted aftermarket houses like AMS Performance but fitment is not an insignificant task and should be undertaken by a competent mechanic. The answer is that it quite radically changes engine characteristics. Stroker engines have a lower rev limit because the pistons travel further. The tighter piston and rod tolerances leave little room for failure and when it does occur interference is common and can cause serious damage. The longer stroke also means more contact time with the piston rings on the cylinder wall, causing more engine wear and the block runs hotter.
Back in the day racers use to stroke ci engines down to ci to allow for high revs and more power. To summarize, just remember that a stroker motor is a standard engine, but with an increased stroke in the cylinder. This increases total displacement resulting in more torque and more horsepower. These motors are often used in muscle cars, as they give it that muscle feeling.
It is very common in the tuner world. In my endeavors to be knowledgeable. I would like to go to a parts yard look for the multiple pieces for the inches I want to build.
Machines those parts as needed, and bypass every stroker that finds a place in my pocket. Its a lot of money to have the desire, and watch your hard earned cash supply another racers corner. And for the info I do find here and what I can use and understand. Im hoping for some kind of success.
I know this is an older article but it is the simplest I have come acros that gave me the oh i get it moment. Currently you have JavaScript disabled. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page. Click here for instructions on how to enable JavaScript in your browser. How an Engine Works The standard internal combustion engine works by taking linear force and turning it into rotational force through a rotating assembly crankshaft.
What is Torque? Why Increase Stroke? How Does It Increase Torque? Common Stroker Motors The most common size stroker motor varies from engine to engine. Summary To summarize, just remember that a stroker motor is a standard engine, but with an increased stroke in the cylinder.
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