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Sledgehammer® crankshafts are the perfect foundation for a budget minded engine build. Forged from 4340 non-twist steel, this line of durable Lunati cranks feature a special Nitride heat treatment, sonic cleaning, and micro-polishing for added insurance in performance street engines and mild race applications. Each crankshaft incorporates many premium features normally found on high end race crankshafts, such as drilled lightening holes in the pin arms to reduce reciprocating mass.
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Lunati Pro Series™ forged crankshafts are top of the line units, manufactured from the highest quality 4340 certified steel. Our 4340 steel forgings meet aircraft quality standards for material cleanliness and purity. Every crank is American forged, American machined and quality checked to meet our exact specifications including: a shaft surface finish of grade 5 RMS or better, journal radii are ground to .140 inch, roundness of each journal is .0001 inch or less and each rod journal is drilled with a 7/8 inch or 3/4 inch lightening hole to reduce the inertia weight of the crankshaft. The Pro Series™ by Lunati is engineered with high performance street and all-out race engines in mind.
Pro Series™ Crankshafts have been successfully used in 1,500+ hp applications.
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The Pro Blower™ series is designed to withstand the extreme pressures encountered when using a roots style supercharger, known commonly as a blower. Lunati knows what it takes to handle big power numbers so we paid special attention to critical areas that are affected by power adder applications. They feature dual keyways, a 3/4 inch - 16 thread nose and the flange is drilled to either 1/2 inch or 7/16 inch. There are 7/8 inch lightening holes in the #2, #3 and #4 rod journals, however the #1 journal is not drilled, to provide extra strength on the front of the crankshaft where a roots blower applies extra stress.
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The Alecular material used in Lunati bearings allows a high degree of conformability over other race bearings, whether you are use steel or aluminum rods. Imbedability is four times greater than other bearings, plus they will not flake. The fatigue point of Alecular material is 1100 degrees fahrenheit, while babbitt overlay is only 400 degrees fahrenheit. Thickness tolerancing is held (0.0001), making Lunati bearings an excellent choice for road racing, oval track and drag racing. Lunati Alecular racing bearings are chamfered to fit Lunati crankshafts.
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The Alecular material used in Lunati bearings allows a high degree of conformability over other race bearings, whether you are use steel or aluminum rods. Imbedability is four times greater than other bearings, plus they will not flake. The fatigue point of Alecular material is 1100 degrees fahrenheit, while babbitt overlay is only 400 degrees fahrenheit. Thickness tolerancing is held (0.0001), making Lunati bearings an excellent choice for road racing, oval track and drag racing. Lunati Alecular racing bearings are chamfered to fit Lunati crankshafts.
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