Why replace your cylinder when you can replace the piston for a fraction of the cost and time? Namura offers direct replacements for the original equipment as well as hi-compression and a variety of oversizes to meet your ride’s needs. They are available in 0.25mm increments, from the -1 (0.25mm) through the -8 (2mm) oversize. The Company also carry B (0.01mm) and C (0.02mm) oversizes which help extend the life of your expensive coated cylinders; a selection of big bore piston kits is available for some applications. Combine this with the MOS2 coating and hard anodizing, Namura gives you a higher performance piston without the higher price. Namura piston kits come with the piston individually wrapped; a set of OEM quality rings packed in their own box, a wrist pin, and circlips.
MOS2 (Teflon/Molybdenum) Coated Skirts - A rolled-on application process provides a bond that is 10 times stronger than other spray on coatings. Benefits include increased heat transfer, reduced friction, and helping to eliminate cold seizures.
Machined Smooth Heads - Reflects combustion heat and reduces carbon buildup, protecting the top of the piston. Some tests have shown this feature can increase horsepower and fuel economy by up to 6%.
Anodized Domes - Increases heat resistance and durability; pistons with anodized domes are 75% stronger than non-anodized pistons.
Hypereutectic Casting Process - Provides higher silicon content for reduced expansion rates and additional wear resistance; it also has an ability to withstand higher cylinder temperatures.
Namura is proud to bring you the next step in the evolution of powersport pistons. The new Hyperdryve line of pistons was specifically designed as an alternative to the OE for applications that call for the use of forged internals. The major advantage of Hyperdryve pistons is the ability to hold up under temperatures never before seen by cast pistons, without the extra cost of forged equipment.
Hyperdryve pistons are composed of a new hypereutectic aluminum alloy developed for use in the space industry. Engineered to maintain its high tensile strength up to 700°F (370°C), 50% higher than a conventional cast piston, this gives Hyperdryve the strength to perform under operating conditions normally reserved for forged pistons. Hyperdryve is the exclusive line of pistons for 250 and 450CC motocross bikes, as well as select sport quads.
Extensive testing went into the company's choice of material; the images below show two cast aluminum pistons that have been magnified to 1,000 nanometers. Both pistons were soaked for 100 hours at 600°F (316°C) to simulate operating conditions. It's easy to see that the conventional aluminum alloy's particles coarsen significantly; this weakening of the material's bonds will lead to a sharp drop in piston strength. The particles of Namura’s new aluminum alloy have only coarsened slightly, showing that they are still able to maintain a higher strength for longer periods of time.
Additional testing shows figure 1 that the biggest hardness drop occurs after 10 hours of use; Namura’s new aluminum alloy still maintains twice the hardness of conventional alloys, even after 20 hours!
Still not satisfied, figure 2 illustrates the comparison of the company's new material to a typical 4032 forged aluminum alloy. Measurements are noted in HRB on the Rockwell scale (a hardness scale based upon the indentation impression of the material) and MPa (megapascals, a unit commonly used to measure stiffness or tensile strength of materials).
This revolutionary alloy, combined with our already existing features of machined smooth anodized heads (for better heat reflection) & MOS2 coated skirts (giving you smoother startups & break ins) meets the demands of today's 4-stroke engines.
After spending 100 hours soaking at 600°F the particles in the conventional cast piston have coarsened and loosened significantly, leading to a sharp drop in tensile strength. The particles in the Hyperdryve piston have only coarsened slightly, displaying the strength and durability of the material. Even after 100 hours at extreme conditions, the Hyperdryve piston retains a visibly higher tensile strength.
Quality materials mean increased longevity and continued performance. A critical aspect of any rebuild, gaskets are often given little thought. However, the right materials can make all the difference.
Company do all of the thinking, so you don't have to. Company gaskets are manufactured from materials specifically chosen for each individual application. From top-end sets to complete kits for a full teardown, you can be sure that Namura gaskets are up to the task at hand.
Namura gaskets are manufactured to OE-specs, which means no trimming or fitment issues. Company materials are explicitly selected for their temperature, oil, fuel, and coolant-resistant qualities as well as tested using ASTM standards. Each design is evaluated against rigid quality-control standards to ensure each set meets or exceeds OE performance. Clutch gaskets are available for certain applications.
AF Gasket Material - Composed of non-asbestos Nitrile Butadiene bonded Cellulose fiber materials; they are commonly used in clutch cover, oil pump, and coolant applications. Components maintain their tensile strength and torque retention in operating conditions of over 300ºF.
Steel & MLS (Multi-Layer Steel) Gaskets - No other gasket is more crucial than your head gasket. The seal between your cylinder and cylinder head is exposed to more heat and extreme pressures than anywhere else in your engine. In order to match these extreme conditions Company offers one of the most advanced head gaskets on the market. Constructed from multiple layers of stainless steel to resist corrosion and erosive chemicals commonly found in your engine, then using an on-off pattern, Company MLS gaskets are coated/embossed with a Fluoroelastomer based rubber to tightly seal the metallic mating surfaces. By doing this they can withstand the sheering forces created by the two surfaces (cylinder head and cylinder). This coating also enhances the bond between the gasket material and the imperfect surfaces commonly found when rebuilding your engine.
Seals & O-rings - NBR, Fluoroviton, and Silicone are selected for each application based upon the following characteristics: Temperature Resistance, Abrasion Resistance, Chemical Resistance, and their Aniline Point. A Teflon coating is applied on certain applications to prolong performance life.
A top-end rebuild can help to improve the performance of your ride, keeping it running in peak condition. Namura?s Top-End Kits include everything you need to get your ride operational again; pistons, a top-end gasket kit and wrist-pin bearings (where applicable) are all included in this convenient, time saving kit.
Often overlooked and unglamorous, they are an essential part of piston performance, engine efficiency, and durability. The materials used in the manufacturing of piston rings are one of the most critical factors in their performance. Namura’s rings are designed specifically for their application. The type of cylinder sleeve, sleeve coating, size of the engine, and the stroke (2 or 4) all play a role in determining the composition best suited for the operating environment. While it may vary by model, Company have outlined some of the key features below:
Compression Rings - Composed of either a highly ductile cast iron or stainless steel alloy; both materials possess excellent wear resistance and provide a gastight seal. Chrome, phosphate and nitride coatings are also used to meet the demands of the application.
Oil Rings - Oil rings consist of three separate components. Two scraper rails constructed from highly ductile cast iron or a stainless steel alloy and also have a chrome, nitride, or phosphate coating. The single expansion ring is manufactured from stainless steel.