| We are building and installing Z32 motors with Wiseco pistons weekly. We aren't having any issues with piston slap. We've also built several Z32s with 9.0:1 pistons. Raising the CR a little does more for low end torque than going with 89mm. The bore increase just isn't enough to make a substantial difference. The pistons we use are the 2618 which is a more forgiving alloy than the 4032. In the event of unexpected problems at high power levels the 2618 is less likely to crack or break. We haven't been forced to consider the 4032 because we aren't having issues that demand it. Quote from Wiseco's site:
"After thorough inspection, the parts go through an extensive heat-treat and finishing process. This creates an excellent forging with maximum strength and minimum variance. Another benefit to making our own forgings is the ease of making the finished piston design dedicated to your specific engine combination. Most companies buy one-size-fits-all forgings that require massive amounts of milling to create a useable part. These parts are heavy and are not nearly as strong as Wiseco Piston. Wiseco can forge a variety of advanced materials including S.A.E. 4032 and 2618 alloys. High silicon 4032 is a durable and lighter material usually used in naturally aspirated engines. 2618 Alloy is designed for the rigors of blown, marine, and nitrous applications."
Russell Floyd Z1 Motorsports
www.z1motorsports.com
1990+ Nissan Z specialists Used Parts, New parts, Service/Repair and Performance 1200 Carrollton Hwy
Temple, Ga 30179 770-562-8668
770-562-8664 (fax) .JPG)
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