Ford AU 4 Litre Spool H Beam Conrods and CP Forged Pistons
Ford AU 4 Litre Spool H Beam Conrods and Ross Racing Forged Pistons
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Spool AU 4.0 Litre Ford Conrods and Custom Ross Racing Pistons
This combination uses the BA Rod with a Custom Piston
These are a custom piston made for us and rated at 1000hp by Ross Racing Pistons. The pistons come standard with a 0.200" (5mm) Tool Steel 52100 Gudgeon Pin.
Pistons are available in:
- Compression Ratios: 9.0:1
- Bore Sizes: +0.5mm and +1mm
- Pistons come with rings, gudgeon pins and pin locks
- Forged 2618
Ross Racing Pistons:
All of Ross Racing Pistons (since 1985) have been forged from 2618 billet bar stock and have been heat treated and aged to a T61 condition (2618-T61). 2618-T61 is the material that is used when fatigue resistance and durability are of prime importance by all premium racing piston manufacturers.
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
| Product Name | Ford AU 4 Litre Spool H Beam Conrods and Ross Racing Forged Pistons |
|---|---|
| Brands | Spool |
| Engine | 4.0L Inline 6, AU Inline 6 |
| Make | Ford |
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.
Shipping calculations available at checkout.
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 are the recommended bore clearances for the Ross Racing pistons?
For the Ross Racing pistons in the Ford AU 4.0L engine, a typical bore clearance of 0.0025" to 0.0030" is recommended. However, always consult with your engine builder for specific requirements based on your application and intended use.
What compression ratio options are available with this kit?
This kit includes pistons with a standard compression ratio of 9.0:1. If you require different compression ratios, custom options may be available through Ross Racing Pistons, but this will depend on your specific engine setup and tuning goals.
Do I need to modify the conrods for my engine?
The Spool H Beam conrods are designed to fit the Ford AU 4.0L engine, but it is common to require big-end or small-end honing to ensure proper fitment due to manufacturing tolerances. Always check clearances before installation.
What is the maximum power rating for this conrod and piston combination?
The Ross Racing pistons are rated for up to 1000hp, but actual power handling will depend on your engine's specific setup, including tuning, fuel quality, and boost levels. Reliability is contingent on proper machining and assembly practices.
What type of fasteners are used with the conrods, and what are the torque specifications?
The conrods come standard with ARP2000 fasteners. For 3/8" bolts, torque them to around 55 ft-lb using ARP Ultra-Torque lubricant. If you upgrade to L19 bolts, follow ARP's stretch specifications instead of torque for proper installation.
