Spool RB30 - RB34 3.4L Stroker Kit with Custom CP Pistons
We carry a limited range of pistons for this kit in stock. If we don't have your exact requirements it will take 6-8 weeks to have pistons made.
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SPOOL RB34 94mm 3.4L Stroker Kit
World's biggest capacity off the shelf RB30 Stroker Kit: RB34 Stroker Crank to Suit Nissan Skyline RB30 and Holden RB30 VL Commodore engines.
CP Pistons available for RB30 (RB26 or RB25 Twin Cam cylinder head conversions) and SOHC cylinder heads. Any bore size or compression ratio available.
Note: The std OEM crank girdle can be used with the RB34 crank setup. The girdle may require minimal clearancing.
RB34 Stroker Kit Includes:
- Spool Billet 4340 full counter weight 94mm Stroker Crankshaft
- Spool H 3/8 ARP-2000 Bolts (ARP L19 Bolts and Custom Age +625 available as an upgrade) or I Beam Forged Connecting Rods with 3/8 ARP L19 Bolts (Custom Age +625 available as an upgrade)
- CP Custom Pistons (rings, pins and locks included)
- 9310 0.200" Gudgeon Pins standard (5mm wall thickness) (0.250" Pins available as an upgrade)
If you're planning to stroke your RB30 you have come to the right place. SPOOL offers the worlds biggest off the shelf RB30 stroker kit. The kit includes a 94mm full counter weight Billet 4340 Nitrited crankshaft with long oil pump drive, I beam connecting rods and CP forged pistons and rings.
As you can see from the table below. The RB34 has a very similar rod/stroke ratio as the Nissan CA18 and Toyota 2JZ both of which love to rev and have been around a long long time.
| Engine | Rod Length(mm) | Stroke(mm) | Rod/Stroke Ratio |
|---|---|---|---|
| SR20 Stroker | 136.3 | 91 | 1.50 |
| 2JZ 3.4 | 142 | 94 | 1.51 |
| CA18 Stroker | 133 | 87.6 | 1.52 |
| LS Stroker | 155.57 | 101.6 | 1.53 |
| BA | 153.92 | 99.31 | 1.55 |
| EL/EF | 149.35 | 96.31 | 1.55 |
| 3RZ | 147 | 95 | 1.55 |
| RB28 | 121.5 | 77.7 | 1.56 |
| SR20 | 136.3 | 86 | 1.58 |
| CA18 | 133 | 83.6 | 1.59 |
| RB34 | 152.5 | 94 | 1.62 |
| 2JZ | 142 | 86 | 1.65 |
| RB26 | 121.5 | 73.7 | 1.65 |
| RB32 | 152.5 | 91 | 1.68 |
| 1JZ | 125.25 | 71.5 | 1.75 |
| RB30 | 152.5 | 85 | 1.79 |
Like all SPOOL cranks, this is a true billet crank machined from forged 4340 bar stock.
All components, crank, connecting rods and pistons are balanced.
With the increased cubic capacity from the 94mm stroker crank, increases of up to 50% in torque and low to mid range power are achievable. Boost will come on earlier in the rev range and peak power will increase.
CP pistons come with rings, pins and lock. The gudgeon pins are upgraded to 9310 hardened alloy steel with 5mm wall thickness.
We have customers making over 1000 hp with our billet crankshafts
Note: Clearancing of the cylinder block is sometimes required.
| Product Name | Spool RB30 - RB34 3.4L Stroker Kit with Custom CP Pistons |
|---|---|
| Brands | Spool |
| Engine | RB30DET (DOHC), RB30ET (SOHC), RB34 Stroker |
| 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.
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Disclaimer:
Product images are for description purposes only. Actual product may vary.
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If you are unsure, get in touch by emailing [email protected], messaging us on Facebook, or phoning us at +61 7 5645 1333 (8am to 2pm AET).
What is included in a typical Spool engine kit?
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 machining for the Spool RB34 Stroker Kit?
The Spool RB34 Stroker Kit may require honing of the big-end and small-end of the conrods to achieve the correct clearances. Additionally, the cylinder block may need clearancing to accommodate the 94mm stroker crank. It's essential to ensure that all components are balanced as a complete assembly.
What are the compression ratio options for the CP pistons in this kit?
The CP pistons included in the Spool RB34 Stroker Kit can be customised to any bore size or compression ratio based on your specific engine setup and performance goals. It's crucial to discuss your requirements with your engine builder to ensure optimal performance.
Can I use the standard OEM crank girdle with this stroker kit?
Yes, the standard OEM crank girdle can be used with the RB34 crank setup. However, it may require minimal clearancing to fit properly, so be sure to check for any interference during installation.
What are the torque specifications for the ARP bolts included in this kit?
The Spool RB34 Stroker Kit comes standard with ARP2000 bolts, which should be torqued to around 55 ft-lb for 3/8" bolts. If you opt for L19 bolts, they should be tightened by stretch, specifically 0.0060"–0.0065" for 3/8" bolts. Always refer to ARP's latest instructions for the most accurate specifications.
What power gains can I expect from using the RB34 Stroker Kit?
With the increased cubic capacity from the 94mm stroker crank, you can typically achieve increases of up to 50% in torque and enhanced low to mid-range power. However, actual performance will depend on factors such as tuning, fuel quality, boost levels, and overall engine setup.
