Eagle Rods Mazda Miata (1.6/1.8 B6/BP engines) CRS5233M3D

Fitment Information

• Mazda Miata (1.6/1.8 B6/BP engines)

Specs

• Sold as a full set
• Recommended up to 900hp
• length: 5.233 in.
• rod journal: 1.7700 in.
• housing bore: 1.8900 in.
• pin size: 0.787 in.
• big end width: 0.8580 in.
• pin end width: 0.8580 in.
• thickness above pin: 0.180 in.
• typical weight: 535g

Product Description

All Eagle H-beam rods are forged from certified 4340 chromoly steel. While a lot of companies make rods from this material, if you pay close attention, you will notice not all 4340 is the same. For instance, to be classified as “4340 steel” certain alloying elements must be present in certain percentages. AISI/SAE specifications call for 1.65% to 2.00% nickel content. While this seems like a small difference, understand that this is almost an 18% variation. 4340 steel with 1.65% nickel will act a little differently than 4340 steel with 2.00% nickel content. This is just one of many alloying elements involved in creating 4340 steel. Through extensive material testing, Eagle works closely with the foundry we use to achieve a much tighter tolerance of all alloying elements to our specific requirements. Along with this, the heat treatment and tempering process used is vital to producing a stong steel. While exactly what we do is a closely guarded secret, all of this attention to detail results in a stronger and much more consistent material. Our “4340” steel routinely tests 10-15% stronger than “typical” SAE/AISI spec 4340 steel.

Another important design feature is all Eagle H-beam rods are manufactured from a 2 piece forging. This is significant because it enhances the strength of the rod cap by orienting the “grain” of the metal with the direction of stress. The stress exerted on the cap is perpendicular to the stress on the beam. Forged metal, like wood, has a grain “flow”.

Eagle’s commitment to quality and service has resulted in customer loyalty and satisfaction. This, in turn, has fueled rapid growth over the years. Eagle added crankshafts to our lineup a few years later as well as expanding our offerings in connecting rods. Continuous design improvements and improvements in materials and manufacturing techniques have resulted in Eagle being the largest and most respected aftermarket connecting rod and crank manufacturer in the industry. We never stop researching ways to make our products lighter, stronger, more efficient to manufacture, and more diverse. When you stop moving forward, you get passed by the competition.

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