Our Sport Compact pistons are made from dedicated forgings produced in-house to give you a light weight piston with superior strength and optimal design. Being the multivalve piston technology leader, the line features specially designed valve pockets, complex dome and crown shapes, the steel nitride/napier xx rings and optimized skirt profiles. The pistons come standard with our ArmorGlide® coating material for reduced friction and noise, freeing up horsepower.
Automotive Forged Piston Advantage
Wiseco leads the performance aftermarket by producing the highest quality forged pistons for domestic automobiles, sport compact and racing applications right here in the USA. Wiseco is unique because we forge all of our own pistons in house, and produce all of our own forge tooling right here in the USA. This allows us to control all aspects of our manufacturing process from raw bar to skirt coating finished parts.
In addition, in-house dyno testing gives Wiseco the ability to develop state-of-the-art technology such as new shapes, coatings, and components, and lead the industry through rigorous R&D. Linking all segments of Wiseco’s organization through design, testing, manufacturing, and distribution allows us to fulfill market needs with minimum lead-times.
Extreme racing conditions demand the strength and toughness that only forged pistons can offer. Compared to cast pistons, forgings are tougher and more durable, and will stand up to the abuse that high performance motorsport applications require. Most castings are brittle, have no grain structure and tend to fail catastrophically when the material yield strength is exceeded. Forgings have condensed grain that is aligned to the features of the part, which produces higher mechanical properties, and resistance to impact and fatigue. Each forging is designed to optimize the strength-to-weight ratio, and maximize performance.
Piston Engineering/ArmorGlide Coating
Wiseco’s detailed skirt shapes and profiles are very specific to each application. Variable cam programming software developed in house allows Wiseco to produce high-performance shapes unique to only Wiseco. The skirt shape (barrel/cam) is one of the most functional areas on the piston, and provides stability and smooth operation in the cylinder bore. Stability is important for proper ring seal, reduced friction, and quiet operation. Each skirt shape is designed for a specific running clearance, based on coefficient of thermal expansion of the piston alloy. Some forging alloys expand more than casting alloys, but each Wiseco piston is designed with the proper installed clearance to produce the most power, least wear, and best seal at running temperature, for each application. Comparing installed clearances on cast vs forged parts is not indicative of the running clearance at temperature. Wiseco engineers have a strong background in all forms of racing applications, and produce the best shapes and designs in the industry.
Some of our forged pistons offer our new ArmorGlide™ skirt coating, which is the result of testing, development, and benchmarking through Wiseco’s rigorous in-house dyno program. The outcome is the ultimate in skirt coating toughness, lubrication, and bond technology working together to minimize friction, maximize horsepower, and provide improved wear resistance. Not only is ArmorGlide™ a high-tech lubricant that reduces friction, but it also allows the piston to be fitted tighter within the bore allowing a better ring seal and reduced noise from piston rock.
Piston Specs:
K640M875
Bore: 87.5mm/3.445in
Over Size: Standard OE Size Bore
Stroke Length: 94mm/3.701in
Rod Length: 150.55mm/5.927in
Compression Height: 32.25mm/1.27in
Head cc's: 42cc
Dome Dish: -13.3cc
Gasket Thickness: 0.5mm/0.018in
Deck Clearance: 1.0- mm/0.040- in
Block Height: 231mm/9.095in
Compression Ratio: 9.5:1
Pin Diameter: 22.5mm/0.886in
Ring Set: 8750XX
Grams: 342g
K640M88
Bore: 88mm/3.464in
Over Size: 0.020in Over Bore
Stroke Length: 94mm/3.701in
Rod Length: 150.55mm/5.927in
Compression Height: 32.25mm/1.27in
Head cc's: 42cc
Dome Dish: -13.3cc
Gasket Thickness: 0.5mm/0.018in
Deck Clearance: 1.0- mm/0.040- in
Block Height: 231mm/9.095in
Compression Ratio: 9.5:1
Pin Diameter: 22.5mm/0.886in
Ring Set: 8800XX
Grams: 348g
