Spool RB30 (SOHC) Forged Connecting Rods and Custom CP Pistons.
Pistons are available in:
Compression Ratio: 8.5:1
Bore Sizes: 86.5mm
Pistons come with rings, gudgeon pins and pin locks
Spool Connecting Rods Feature:
ARP 2000 fasteners (L19 fasteners are available as an upgrade)
High tensile 4340 forged steel
2 Piece forging
Hardness of HRC36-42
Dowelled caps for precision alignment
X-RAY & Sonic tested
Quenching and heat treated
Shot peened
100% Magnafluxed
Weight Matched Sets +/- 1 gram
Vacuum degassed to remove impurities
CP Pistons standard features include:
5310 gudgeon pins (9310 thicker wall thickness pins are available as an upgrade)
Deep valve reliefs accommodate high lift camshafts
Larger valve reliefs for +1mm valve sizes
Custom skirt cam and barrel design
Accumulator grooves
High strength aluminium forgings
High performance rings
Fully CNC machined and balanced to +/- 1 gram
Wrist pins included
Double pin oilers force fed from oil ring groove
Pick lock grooves for easy lock removal
Pin fitting included
Note: We recommend Joe Gibbs Break in Oil for all new engines.
More Information
Product Name
Nissan RB30 (SOHC) Conrods and CP 8.5:1 Forged Pistons
Brands
Spool
Engine
RB30ET (SOHC)
Make
Holden, Nissan
Delivery & Freight
We are an Australian-based company that ships items nationally and internationally, usually within 48 hours of receiving your order. High-value items shipped internationally are sent via DHL Express, while lower-value items are sent via Australia Post Express unless otherwise instructed.
You can calculate shipping rates inside the shopping cart. After adding all the products you would like, navigate to the cart and click the ESTIMATE SHIPPING & TAX link. .
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If you have issues calculating freight, please get in touch. We are happy to help.
Disclaimer:
Product images are for description purposes only. Actual product may vary.
Kits usually include pistons, rings, rods, bearings and related hardware depending on the engine family. Check the listing for exact inclusions.
Do I still need machining with a full engine kit?
Yes. The block must be honed and all clearances checked and set by your builder. Assembly should only occur after full measurement and verification.
What is the recommended bore clearance for the CP 8.5:1 forged pistons?
The recommended bore clearance for the CP 8.5:1 forged pistons in the RB30ET engine typically ranges from 0.0015" to 0.0025". However, it's crucial to confirm this with your specific engine build and intended use, as clearances can vary based on factors like operating temperature and power levels.
What are the torque specifications for the ARP2000 bolts in the conrods?
For the ARP2000 bolts included with the Spool RB30 conrods, the recommended torque value is around 55 ft-lb when using ARP Ultra-Torque lubricant. Always ensure to follow ARP's latest instructions for the most accurate specifications.
Do the CP pistons require specific ring gap settings?
Yes, the CP pistons come with high-performance rings that require specific ring gap settings. It's advisable to set the ring gaps based on your engine's intended use, typically around 0.004" to 0.005" per inch of bore diameter, but consult your engine builder for precise recommendations.
Can I use higher compression pistons with the RB30ET conrods?
While the conrods are designed to work with the CP 8.5:1 pistons, you can use higher compression pistons if your engine build supports it. However, ensure that your tuning, fuel quality, and boost levels are adjusted accordingly to maintain reliability and performance.
What is the benefit of the dowelled caps on the conrods?
The dowelled caps on the Spool conrods provide precision alignment during assembly, which helps maintain consistent bearing clearances and improves overall strength and reliability under high-stress conditions. This feature is particularly beneficial in performance applications.
