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Kelford camshafts, Subaru EJ20/EJ25, Dual AVCS (2007-2021)
1 262,00 €
Kelford camshafts for the Subaru EJ20/EJ25, Dual AVCS engine. Choose a profile to suit your engine parts and intended use. Profile specifications and required modifications are detailed below.
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Kelford is a New Zealand camshaft manufacturer with roots in Christchurch dating back to 1968. Its profiles range from upgrades for street-driven cars to fully built race engines. Choose the cam around the rest of the engine and its intended use, rather than simply picking the longest duration.
This selection is for the Subaru EJ20/EJ25, Dual AVCS engine. Profile differences, spring recommendations and required modifications are detailed below.
Technical specifications – available profiles for this engine
Profile 220-A
Torque and throttle-response profile for a near-stock EJ257. Suits rally classes using a 36 mm intake restrictor and a 46–54 mm turbo. Recommended springs: KVS109-STI.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.20mm cold at the cam | 0.25mm cold at the cam |
| Cam lift | 9.75mm | 9.75mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 9.55mm | 9.50mm |
| Advertised duration @ 0.25mm | 256° | 260° |
| Duration @ 1.00mm valve lift | 218° | 222° |
| Timing IVO @ 1.00mm valve lift | 21 ATDC | – |
| Timing IVC @ 1.00mm valve lift | 59 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 57 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 15 BTDC |
| Suggested centre lines | 130° | 126° |
Manufacturer profile information
Profile 220-B
Higher-lift circuit and rally profile for a 54–60 mm turbo, aiming for better throttle response and mid-range pull. Recommended springs: KVS1847-BT.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.20mm cold at the cam | 0.25mm cold at the cam |
| Cam lift | 10.90mm | 10.45mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 10.70mm | 10.20mm |
| Advertised duration @ 0.10mm | 264° | 260° |
| Duration @ 1.00mm valve lift | 230° | 226° |
| Timing IVO @ 1.00mm valve lift | 15 ATDC | – |
| Timing IVC @ 1.00mm valve lift | 65 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 59 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 13 BTDC |
| Suggested centre lines | 130° | 126° |
| Valve lift at TDC | 0.15mm | 0.22mm |
Manufacturer profile information
Profile 220-C
Race profile for a built EJ257 with a 58–66 mm turbo. Suitable for E85. Head machining is required for the high-lift lobes. Recommended springs: KVS1847-BT.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.20mm cold at the cam | 0.25mm cold at the cam |
| Cam lift | 11.50mm | 10.75mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 11.30mm | 10.50mm |
| Advertised duration @ 0.10mm | 272° | 268° |
| Duration @ 1.00mm valve lift | 236° | 232° |
| Timing IVO @ 1.00mm valve lift | 12 ATDC | – |
| Timing IVC @ 1.00mm valve lift | 68 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 62 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 10 BTDC |
| Suggested centre lines | 130° | 126° |
| Valve lift at TDC | 0.25mm | 0.37mm |
Manufacturer profile information
Profile 220-D
Top-end-focused race profile for a 64–72 mm turbo and a larger intake manifold. Suitable for E85. Head machining is required for the high-lift lobes. Recommended springs: KVS1847-BT.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.20mm cold at the cam | 0.25mm cold at the cam |
| Cam lift | 11.70mm | 11.25mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 11.50mm | 11.00mm |
| Advertised duration @ 0.10mm | 282° | 278° |
| Duration @ 1.00mm valve lift | 244° | 242° |
| Timing IVO @ 1.00mm valve lift | 8 ATDC | – |
| Timing IVC @ 1.00mm valve lift | 72 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 67 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 5 BTDC |
| Suggested centre lines | 130° | 126° |
| Valve lift at TDC | 0.47mm | 0.62 mm |
Manufacturer profile information
Profile 220-E
Drag profile for high rpm and boost. Intended for a ported head, 1 mm oversize valves and a turbo of at least 67 mm. For E85 or methanol. Requires fixed cam timing and AVCS removal. Recommended springs: KVS1847-BT.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.20mm cold at the cam | 0.25mm cold at the cam |
| Cam lift | 11.20mm | 11.25mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 11.00mm | 11.00mm |
| Advertised duration @ 0.25mm | 292° | 294° |
| Duration @ 1.00mm valve lift | 250° | 252° |
| Timing IVO @ 1.00mm valve lift | 13 BTDC | – |
| Timing IVC @ 1.00mm valve lift | 57 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 64 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 8 ATDC |
| Suggested centre lines | 112° | 118° |
| Valve lift at TDC | 2.42mm | 1.85 mm |
Manufacturer profile information
Checking heights are shown with the duration figures. Net lift is the net valve movement specified by the manufacturer, while cam lift is listed separately. IVO/IVC denote intake valve opening/closing and EVO/EVC exhaust valve opening/closing. BTDC/ATDC mean before/after top dead centre, and BBDC/ABDC before/after bottom dead centre.
Installation and profile selection
Confirm the exact engine version, valvetrain design and the modifications required by the profile. Check cam timing and valve-to-piston clearance during installation. Springs, lifters and other supporting parts mentioned with a profile are not included unless the profile explicitly states that they come with the kit.
Examples of related vehicle applications
- Subaru Impreza WRX STI GR/GV EJ207/EJ257 (2007–2014)
- Subaru WRX STI VA EJ207/EJ257 (2014–2021)
The list covers versions with the specified engines only. Exact fitment and required modifications depend on the selected profile, cylinder head, lifters and timing system.
| Weight | 10 kg |
|---|---|
| Brand |
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