Crankshafts


They say that the heart of the engine is the camshaft, since it is one of the key components that dictates the engine’s power level, power band, idle quality, and other characteristics. If the cam is the heart, then the crankshaft is the spine. The crankshaft also dictates power and powerband, but in a much more ambivalent way (through its stroke which, along with the bore size, dictates the engine’s cubic-inch displacement). The crank is what transfers the up and down reciprocating movement of the piston and rod into the rotating motion required to drive the transmission. It carries the weight of all eight rods and pistons, and must deal with the shock loads of the combustion process. A stock crank does this fine...in a stock engine. But when power levels start to climb, that stock crank will eventually give under the tremendous loads imposed upon it.








Cast.
Superstreet Series

Speedmaster cast nodular iron crankshafts are perfect for mildly built street engines or just to replace stock crankshafts that have seen better days. These Speedmaster crankshafts are precision-ground and micro-polished to exacting tolerances.

Product Line Benefits

- Greater carbon content than comun cast iron cranks
- Precision-ground and micro-polished to exacting tolerances
- Economical aftermarket pieces with improved ductility

35%
Stronger than stock cranks



Maximun Strength
Tensile strength of 95,000 Psi
Let’s get one
From US
From AU













Forged-51.
Outlaw Series

Speedmaster 5140 forged steel crankshafts are perfect for high compression or blown street applications as well as most race cars. Horsepower ratings should be limited to the 700HP range for maximum efficiency. For the most serious street and racing applications look to the 4340 Series crankshafts. Speedmaster crankshafts are precision-ground, heat-treated, shot-peened, inspected, and micro-polished for superior tolerance control. Speedmaster crankshafts are also nitride-hardened for superior wear resistance, have straight-shot and chamfered oil holes, and feature lightening holes in all rod throws. These crankshafts also have a large radius on all journals for improved strength and wear resistance

Product Line Benefits

- Better grain structure comparing to cast
- Greater strength
- Much more impact and fatigue resistance than cast

21%
Stronger than our Cast Line



Maximun Strength
Tensile strength of 115,000 Psi
Let’s get one
From US
From AU















Forged-43.
Sportsman Series

For absolutely serious street and racing applications, a 4340 forged steel Speedmaster crankshaft is the only choice. They are perfect for high horsepower, torque and RPM's and work great for all levels of power adders. Horsepower ratings are good for 1000 HP. Speedmaster crankshafts are precision-ground, heat-treated, shot-peened, inspected, and micro-polished for superior tolerance control. Speedmaster crankshafts are also nitride-hardened for superior wear resistance, have straight-shot and chamfered oil holes, and feature lightening holes in all rod throws. These crankshafts also have a large radius on all journals for improved strength and wear resistance

Product Line Benefits

- More chrome and nickel wich increases strength
- Premium grain structure and heat-treating process
- Very high fatigue properties
- Total maximun strength

26%
Stronger than our Forged-51



Maximun Strength
Tensile strength of 145,000 Psi
Let’s get one
From US
From AU
















Billet.
Blacklabel Series

Billet crankshafts are at the top end of the high-performance crankshaft scale, They are precision CNC-machined from a solid chunk of forged steel on state-of-the-art equipment by master craftsmen for precise indexing and throw-to-throw consistency. The grain structure is not stretched or deformed; This makes for a stronger, stiffer, more durable finished product. Most Top Fuel drag racers run billet cranks, as do many circle track racers. Choose a better made billet crankshaft from Speedmaster™ and choose peace of mind.

Product Line Benefits

- Fully Counter Weighted
- The grain structure is not stretched or deformed
- 100% CNC-machined
- Core-hardened and nitrided

13%
Stronger than our Forged-43



Maximun Strength
Tensile strength of 162,000 Psi
Let’s get one
From US
From AU















Quick Comparison




 
Product Line
Cast
Forged-51
Forged-43
Billet
 
Series
Superstreet
Outlaw
Sportsman
Blacklabel
 
Material
Nodular Iron
5140 Steel
4340 Steel
4340 Chromoly Steel
 
Manufacturing Process
Cast
Forged
Forged
Billet
 
Tensile Strength
95,000 Psi
115,000 Psi
145,000 Psi
162,000 Psi
 
Supported HP
500HP
700HP
1000HP
2500++HP



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