Tomei Forged Pistons (without Valve Recession) 86.5mm for Nissan RB26DETT

 

(For both RB26 and the RB28 setup using a Tomei crankshaft)



From the combustion chamber to the cylinder, a piston works inside the core of the engine assembly where the energy of the explosion is converted into rotational movement. The piston suffers the most abuse out off all the components inside an engine, withstanding such factors as the force from constant amounts of massive energy and severe fluctuation in temperatures.


 

Since the piston is one of the most important components in an engine assembly, transferring combusted energy to mechanical movement, it must have enough strength to withstand severe temperature fluctuations and high pressures. Stock OEM manufactured pistons are typically made from cast metal and is ideal for mass production, however they cannot sustain the stress when used in highly modified engines that produce over 100 horsepower per cylinder. By using forged metal made from aluminum alloy to construct our pistons, the metal can then endure severe circumstances beyond the stock level. These forged pistons can withstand combustion pressures of 200 kgf and 11 tons of force with the combusted gas temperatures up to 2,500 degrees Celsius. Tomei pistons that are used in highly tuned RB26 and SR20 engines are the same type of pistons used in Group C and F1 racing.

 

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The metal expansion rate in each piston will differ according to the material of the piston and driving conditions. In order to develop the perfect piston for each and every engine types, we have studied the characteristics of heat expansion in aluminum with many prototypes and countless hours on the engine bench dynamometer. The resulting product is a 3 dimensional profile of the oval and barrel design. We have succeeded to produce a piston in 1/1000 mm of accuracy that applies to the appropriate piston to wall clearance.



Too big of a clearance results in power loss due to escaping gases between the cylinder wall and piston rings (blow-by), with decreased combusted energy transferred to mechanical movement. Another factor that causes blow-by is when the clearance is too large; the piston begins to rock at its pin axis inside the cylinder, causing the piston to scuff the cylinder walls at times. Perfectly circled pistons are unable to wholly expand into the diameter of the cylinder, especially because of the difference in thermal expansion between the top land and piston skirt areas. This is why in some engines, the contact occurs at the vertical position of the perfectly circled piston because of the uneven expansion.

 

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The pistons inside the most modern race engines and high performance engines of today utilize an oil controlled heat eliminating design called the cooling channel. The direct advantage is of course, a cooler piston operation that results in increased torque, improved compression, higher RPMs, increased load capabilities, and prolonged engine life. Since the exhaust gases emit close to 2500° C of heat, it is required for the underside of the piston to sustain less than 300°C in order to maintain the strength in the metal and be able to withstand the enormous energy of the combustion. The larger the thermal energy, the better, however there is a certain temperature limit that must not be exceeded. It is very important to understand not to cross this line when making adjustments. The cooling channel design is proven to reduce 50°~60°C of heat compared to standard pistons, making it advantageous for the engine in terms of overall characteristic.

 

 

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We selected high performance thinner piston ring for less friction loss and to prevent fluttering. This can also prevent having a floating piston ring by reducing its inertia to help cut down the blowby. In addition to it, there will be more open area for designing between the piston head and piston pin; it is possible to set the size and shape of the piston topland freely. Designed in an ideal spec the pistons strength has been dramatically increased.

Our Racing Piston Rings help reduce increase friction durability by 30x over standard. Scuff durability is 1.4x higher than standard rings. We have added Titanium coating to the top ring for added strength.

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About Raw Brokerage

Located in Orlando, Florida, Raw Brokerage was founded at the beginning of 2008. The company started out as an used Nissan RB engine parts website connecting enthusiast with hard to find parts in the United States. Since then Raw Brokerage has expanded into it's 4,500 square foot facility where it distributes thousands of new and used performance automotive parts, perform extensive car and engine builds specializing in the Nissan RB platform. We have accounts on over 300 brands and access to over 1,000,000 parts. Raw Brokerage focuses on it's core values of integrity, value and service. This allows our team to ensure top level customer satisfaction that you can rely on. Regardless of motorsport we are here to assist in getting your car to perform to it's highest potential. So shop with confidence with us when looking for your next body kit, engine block, turbo, or other performance parts.

 

What does that mean for you?

Our team is dedicated to more than just customer service, it's driven to provide customer success.  Just like you we are car enthusiast looking to enjoy the process of the build, the satisfaction of the improvements and the success at the track.


With over a decade operating in the performance automotive industry our team has been there, broke that part, compared the alternatives, and have been part of countless projects.


Just like our cars and yours, we're a company focused on always improving.  We seek to provide quality information, process your order quickly and accurately. 


This is the reason why countless car owners return each day to Raw Brokerage for their performance parts needs.

 
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