Product Description:
Withstanding the Pressure, Surpassing the Standard
As emission norms get stricter, engines lighter and more efficient, and customers more demanding, pistons have to work reliably under combustion temperatures reaching from 1000°C to 2500°C, and ignition pressures of up to 250 bar. Additionally, OEMs are offering million-mile warranties to end users.To keep up with these demands, a variety of new materials and treatments are being developed by OEM vendors.
Garima Global works with such leading vendors of pistons in India to manufacture cutting edge pistons for the aftermarket industry. Our customers also trust us to source pistons and piston rings, and assemble them with our cylinder liners to make liner-piston kit sets. Garima Global supplies these AutoGRACE® brand pistons to discerning customers worldwide.
Pistons serve three important functions in an IC engine:
POWER TRANSFER: Harness the power generated by combustion of air-fuel mix to the crankshaft through the connecting rod
SEALING: Prevent combustion gases from entering crankcase and lubricating oil from entering combustion chamber, and
HEAT DISSIPATION: Transfer heat away from the combustion chamber and into the cooling media.
DESIGN
The crown and the body of the piston may incorporate various design elements to serve a wide variety of purposes.
STEEL STRUTS
Since monometal pistons usually exhibit high thermal expansion, steel or ceramic struts are cast into the piston boss area especially when used in cast iron engine blocks. This restricts the expansion of the piston thus enabling smaller piston-block clearance.
NI-RESIST / ALFIN RING CARRIERS
Diesel engines operate at higher temperatures and pressures than gasoline engines, which causes excessive loads on the piston crown. To re-inforce the top one or two ring grooves, Ni-resist or ALFIN ring carriers are cast into the piston. These ring carriers made from high-strength, austenitic cast iron increase the wear resistance and fatigue resistance of the grooves at elevated temperatures. Dual Ni-Resist, or ring carriers with two ring grooves are also used in particularly heavy-duty engines.
COOLING GALLERY
In turbo-charged / super-charged / inter-cooled / after-cooled engines, thermal loads tend to be even higher. To counter these, a cooling gallery may be cast into the crown of the piston using a salt core. Lubricating oil is sprayed into this gallery from the crankcase which reduces the temperature of the bowl rim, top land and ring grooves, thus guaranteeing longer life.
PISTON PIN BUSHING
Pistons used in engines that operate under especially high loads require a bushing, similar to a con rod small end bushing, to be installed on the piston pin bore. This bushing serves to improve lubrication between pin and piston.
PISTON CROWN DESIGN
There are literally thousands of piston crown designs:
VALVE RELIEF POCKETS
Allow the piston to approach extremely close to the cylinder head without hitting the valves thus maximizing compression ratio.
COMBUSTION BOWLS
Are especially prevalent in diesel pistons since these engines do not have the ignition phase. Cavities of various sizes and shapes are cast / machined into the piston crown inside which combustion occurs. The geometry of the bowl is designed to maximise combustion thus producing higher power.
SPECIAL CONTOURS
To “swirl and squish” or direct the fuel-air mixture are cast / machined into the piston head. They increase the turbulence of air-fuel mix as the piston approaches TDC which causes better mixing and more complete combustion, again maximizing power output.
AutoGRACE® pistons have been developed with the exact head geometry as per OEM specifications, thus ensuring your engine gives the same power output and efficiency as a brand new engine!
Additional Information:
Production Capacity: 50000
Delivery Time: 60 Days
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