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Ductile Iron

  • June 10, 2010

Ductile iron is a form of cast iron which has improved strain resistance due to the spherical shape of the graphite particles in the alloy. Because of this ductile iron is an ideal material for applications that require high stress…

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Metal Casting

  • June 10, 2010

Metal Casting

Metal casting is a manufacturing process where metal is heated to a liquid form and poured into a hollow mold. The metal is allowed to solidify and the resultant casting is removed from the mold.

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Priority Main Oiling

  • June 10, 2010

Priority Main Oiling Block Cut-Away

In a priority main oiling system, the oil from the engines primary oil galley is supplied first to the main bearings and then to the cam, lifters and top end. This ensures that the critical crankshaft main bearings receive adequate lubrication for highly stressed racing applications.

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Heat Treatment (T61)

  • June 10, 2010

When specifying aluminum alloys, there are usually two important numbers used. As an example, C355-T61 is the alloy Dart uses for all of our cast aluminum blocks and cylinder heads. The C355 number refers to the specific elements contained in the alloy, and the T61 refers to the heat treatment used to condition the metal after it is cast to shape.

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Compacted Graphite Iron

  • June 10, 2010
The microscopic structure of gray iron is shown on the left, the stronger CGI is shown on the right.

The microscopic structure of gray iron is shown on the left, the stronger CGI is shown on the right.

Compacted graphite iron (CGI) is a form of cast iron which has elongated graphite particles mixed with spherical graphite particles present within the alloy, as opposed to the graphite “flakes” present in typical cast iron.

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6061 Aluminum

  • June 10, 2010

A billet 6061 aluminum block.

A billet 6061 aluminum block.

6061 is an aluminum alloy containing elements of silicon and magnesium, and is typically supplied in billet rather than cast form.  The alloy has excellent mechanical properties that make it highly suitable for a wide range of high strength manufacturing applications, from automotive parts to aircraft components.

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CNC Machining

  • June 8, 2010

A CNC Machining Center

Computer Numerical Control machining, commonly called CNC, means that all of the actions of the machining center are controlled by a computer program rather than directly by the human operator.

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Platinum Series Cylinder Heads

  • June 8, 2010

The as cast chambers of a Platinum series cylinder head.

The as cast chambers of a Platinum series cylinder head.

The Platinum version of the Dart’s popular Iron Eagle and PRO 1 heads are the direct descendants of Dart’s Pro Stock engine program. wet-flow technology and improved combustion efficiency propelled the project.

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Wet Flow Technology

  • June 8, 2010

A wet flow cylinder, displaying the flow of fluorescent dye.

A wet flow cylinder, displaying the flow of fluorescent dye.

Wet flow testing allows a cylinder head designer to look at how the air/fuel mixture behaves when routed through a head and into the combustion chamber. The air/fuel mixture is much heavier and behaves very differently than dry air, so managing the mixture efficiently gives much better results than just increasing air flow will.

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Billet Aluminum

  • February 3, 2010

Blocks of solid aluminum and various stages of machining a billet engine block.

Blocks of billet aluminum and various stages of machining on billet engine blocks.

The term “billet” generally refers to components which are machined from a drawn or forged blank of aluminum, usually 6061 alloy, rather than a cast shape. Billet aluminum differs from cast aluminum both in alloy and grain structure.

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