Atomic Ford Barra Billet Street Chain Tensioner
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Atomic Barra Street Chain Tensioner
Upgrade the factory Ford Barra timing system with Atomic's Australian-machined OEM+ street tensioner. Designed for stock and performance street engines, its billet-steel body, piston and EN-steel ratchet improve alignment, engagement and durability while retaining factory-like operating behaviour.
Key features
- CNC-machined billet-steel body and piston
- Single-tooth, 90-degree ratchet engagement with reduced tooth count
- Integrated Check Valve (ICV) and Tuned Flow Damping (TFD)
- Improved cold-start air bleeding and increased main-spring stiffness
- Mechanical backstop and over-extension protection
- Designed for approximately +/- 1 mm deck-height variation
Specifications
| Application | Ford Barra 4.0L DOHC; factory replacement and performance street builds |
|---|---|
| Body | CNC billet steel |
| Piston | CNC billet steel |
| Ratchet | CNC billet EN steel |
| Damping | ICV and TFD hydraulic circuits |
| Recommended maximum oil pressure | 80 psi |
| Recommended guide | Atomic Billet Street Chain Guide |
| Manufacturer part number | 306563 |
Critical installation warning
Do not add clicks to the ratchet, force out the piston or lever the guide. Install the tensioner as supplied and remove only the retention pin after installation. Modification or removal of the check-valve components voids the manufacturer's warranty.
Apply Loctite to mounting bolts, rotate the engine by hand before sealing, and prime the oil system by cranking before first start. A brief buzzing noise may occur while air bleeds from the system. This street tensioner is not intended for extreme high-oil-pressure, very high spring-load or harsh-limiter race combinations.
| Product Name | Atomic Ford Barra Billet Street Chain Tensioner |
|---|---|
| Brands | Atomic |
| Engine | Barra XR6 |
| 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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If you have issues calculating freight, please get in touch. We are happy to help.
If you are outside of Australia, you are responsible for any duty or taxes charged by your government."
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).
Will this tensioner suit a Ford Barra engine?
Yes. It is designed as a drop-in OEM+ timing-chain tensioner for Ford Barra 4.0L DOHC engines used in factory replacement and performance street applications.
What oil pressure is this tensioner designed for?
Atomic recommends a maximum of 80 psi for optimum operation. Higher pressure increases chain load and can contribute to chain or guide failure; this is not the race-spec tensioner for extreme oil-pressure setups.
How should the ratchet be set during installation?
Do not add clicks, force the piston out or lever the guide. Install the tensioner in its supplied position and remove only the retention pin after installation.
What deck-height variation can it accommodate?
Atomic states a tolerance of approximately plus or minus 1 mm. Engines with thick head gaskets or unskimmed blocks and heads may require guide modification; confirm the combination before installation.
What should I do before first start?
Apply Loctite to the mounting bolts, rotate the engine by hand, then prime the oil system by cranking so the cylinder head and tensioner fill with oil. Ensure the retention pin has been removed.
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