Magnum X-S II

Magnum X-S

Magnum X-S cranks are fully machined, stress-riser free, lightweight crankshafts. These have been designed to accommodate the specific requirements of high level motorsports competitiors. All X-S cranks feature the Callies Angalite rod journal drilling. Small Block Magnum X-S Totally machined and flawless, describes the entire surface of each small block Magnum X-S. This shaft is intended for high level competition, and high output engines. A 3.800 in. stroke Chevy SB crank will typically weigh 45 lbs. when balanced to a 1850 bob weight. Shorter strokes are lighter. The SB Magnum X-S is not intended to be an extremely light crankshaft. Our goal is to produce a durable shaft that possesses the characteristics of high durability and low inertia weight. Magnum X-S shafts are not center counterweighted. Counterweights have been strategically located for reduced bearing loads on the number 2 and 4 main bearings. This is accomplished by relying more on inboard counterweights vs. the large end counterweights for balance. To reduce bearing loads, the intermediate counterweights have been purposely made larger. SB Magnum X-S feature center drilled mains and Angalite drilled rod journals. Big Block Magnum X-S Full symmetric counterweights located for inertia positioning can be seen in this view. Counterweight location has often been determined strictly by the balance characteristics of the assembly. Equally important and often overlooked is their function of offsetting inertia loads generated while in operation. These loads determine oil film thickness and the resulting frictional losses within the engine. Big block crankshafts with our symmetric counterweight configuration are the most successful and accepted design for endurance applications. Bearing wear is minimized producing excellent long term reliability. In drag racing, the light weight Magnum X-S big blocks have been the choice of top engine builders around the country. This shaft will have an average weight at least 6-10 lbs. lighter than a conventional BB crankshaft. A typical 4500 stroke BB will tip scales at only 68 lbs., balanced. Magnum X-S Additional Features Pin Arm Profiling Magnum X-S rod arms are uniquely profiled. This profiling creates a completely contoured structural member. The rounded corners are beneficial in the reduction of weight and power robbing windage. Strength is not sacrificed through the elimination of all sharp corner stress risers. Gun drilled main bearing hole Another view of contouring and lightening hole work that has been done on the Magnum X-S. Main centered gun drilling is done to specific standards. Inside diameter (I.D.) surface finish requirements for the center lightening hole are set at 9 Rms micro finish or less. The opening of each hole is detailed with a .100 in. radius. These two elements insure that stiffness and long term bending fatigue have not been compromised. After our ion nitride heat treat, the Magnum X-S is actually a stronger shaft. Big Block Post The gear and damper fit area on each Magnum X-S crank is fully finished. Blower engines using the crank post to power the supercharger, and endurance engines both benefit from this detail. Crankshaft posts often times are subjected to severe bending loads. The post radius and post shoulder radius can be potential areas of fatigue. Surface finish is critical on any area that is subject to bending loads. A ground and polished surface finish is significantly less notch sensative, and is effective in eliminating an origin point for potential crack propogation. All Callies BB posts feature dual keyways.

Magnum Plus Crankshafts

Small Block Chevy Crankshafts Callies Magnum Plus crankshafts are manufactured from the finest 4340 forgings, subject to the most critical quality control and inspection procedures in the industry. Available in strokes from 3.000 - 4.250-inch they are premium heat treated to a depth of 0.015 - 0.022-inch. All rod and main journal fillets are ground with full .125 radii. Journals are micro-finished to 5 microns or less and out-of-roundness is held to less than 60 millionths. Small block crankshafts are machined with Callies unique deep hold post drilling, a feature that has virtually eliminated crankshaft post failure. For additional weight reduction, the Magnum can be ordered with Callies original Inertia Light option. Magnum Plus cranks have the Angalite drilled four rod journal lightening holes and are center main drilled. Magnum Plus Big Block Magnum Plus Chevy BB crankshafts are intended for the most demanding applications. These fully counterweighted crankshafts are made from our premium 4340 material that is double heat treated, then hardened to produce one of the toughest crankshafts ever made. Callies produces these shafts in strokes from 3.750 to 5.300 in. All journals feature Callies Tru-form radii for maximum strength. Each rod journal is Angalite drilled reducing rotating inertia. Magnum Plus crankshafts can be specially drilled for applications using larger than standard flange and post bolts. Special keyway configurations are also available upon request. One Piece Rear Seal Flanges Big Block - One piece seal design available for 1990 and newer, 4.250: and 4.375" stroke. Small Block - One piece seal design available for 1986 and newer, 3.750" and 3.875" stroke

PRO-I Connecting Rod

The Callies Pro-I Connecting Rod is designed for serious high performance street and sportsman class competition. The Pro-I rod is now available for big block and small block Chevy engines. This completely profiled forged billet, I-beam, rod is stronger more resistant to stress-riser induced failures. The Pro-I is a fully machined 4340E part, with many features that prove we have gone the extra mile in the design and machining of this rod. All bore faces are Blanchard ground to ensure parallel contact with the crankshaft and adjacent rods. Callies Pro-I small block rods are available in 5.7, 5.850, 6.0 and 6.125 inch lengths. A typical weight for the 6.0 inch rod is 660 grams. Big block Pro-I rods are available in 6.385 and 6.535 lengths. The 6.385 rod will typically weigh 790 grams. ARP 190,000 PSI, 7/16 in. diameter bolts are used to fasten this rod. These bolts are made with 7/16 in. wrenching. The advantage to 7/16 in. wrenching is found in greater rod bolt to block pan rail clearance. This head configuration does not compromise any aspect of the bolt's ability to maintain a solid clamping load. Precision dowel sleeves are installed in the rod cap, maintaining exact alignment between all surfaces. PRO-I Features Counter bore in bolt hole of tower shoulder This machining operation removes unused threads cut into the tower shoulder. Left untouched these threads are potential stress risers located in a sensitive area. The counter bore provides a smooth notch free surface. Chamfered parting faces A slight chamfer has been placed on the inside edge of the mating faces within the rod journal housing bore. This step in our process eliminates your need to de-burr the rod during assembly. Eliminating the potential for burr interference helps ensure roundness within the assembles housing bore. Tower and Bore Faces All edges are chamfered throughout the rod, eliminating sharp corners. A rounded corner is considerably less likely to sustain a threatening nick. Due to the nature of the bending loads placed on the rod tower, this region is notch sensitive. After this step in our process the rod is completely shot peened creating a case hardened layer of residual strength.