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Kelford camshafts, Nissan RB25DET NEO (1998-2002)
1 078,00 €
Kelford camshafts for the Nissan RB25DET NEO 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 Nissan RB25DET NEO engine. Profile differences, spring recommendations and required modifications are detailed below.
Technical specifications – available profiles for this engine
Profile 244-A
Street and drift profile for a 54–62 mm turbo. Focused on low and mid-range pull and quick spool, retaining NVCS. Retains the original base circle without head machining for cam clearance. Stock springs suit up to 7500 rpm and 14 psi boost. KVS25NEO-DI springs are recommended beyond this. The exhaust cam has a yoke-type CAS drive.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.25mm cold at the cam | 0.30mm cold at the cam |
| Cam lift | 9.20mm | 9.20mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 8.95mm | 8.90mm |
| Advertised duration @ 0.10mm | 264° | 264° |
| Duration @ 1.00mm valve lift | 226° | 226° |
| Timing EVO @ 1.00mm valve lift | – | 47 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 1 BTDC |
| Suggested centre lines | Variable / VVT | 114° |
| Valve lift at TDC | – | 0.87 mm |
Manufacturer profile information
Profile 244-A2
For street, drift or drag use with a 58–68 mm turbo. Adds mid-range and top-end pull while retaining NVCS. Factory springs can be used up to 7,500 rpm and 14 psi. Beyond this, KVS25NEO-DI springs are recommended. Retains the factory base circle and requires no head clearancing. The exhaust cam has a yoke-style CAS trigger.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.25mm cold at the cam | 0.30mm cold at the cam |
| Cam lift | 9.20mm | 9.20mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 8.95mm | 8.90mm |
| Advertised duration @ 0.10mm | 264° | 272° |
| Duration @ 1.00mm valve lift | 226° | 234° |
| Timing EVO @ 1.00mm valve lift | – | 51 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 3 ATDC |
| Suggested centre lines | Variable / VVT | 114° |
| Valve lift at TDC | – | 1.20 mm |
Manufacturer profile information
Profile 244-B
A higher-lift profile for a 64 mm or larger turbo, also suited to a 3.0-litre bottom end. Intended for powerful street, drift or circuit cars. Retains NVCS. Head machining may be required for lobe clearance. The exhaust cam has a yoke-style CAS trigger. Recommended springs: KVS25NEO.
| Specification | Intake | Exhaust |
|---|---|---|
| Valve clearance | 0.25mm cold at the cam | 0.30mm cold at the cam |
| Cam lift | 9.55mm | 9.60mm |
| Rocker ratio | 1 | 1 |
| Net valve lift | 9.30mm | 9.30mm |
| Advertised duration @ 0.10mm | 264° | 272° |
| Duration @ 1.00mm valve lift | 230° | 238° |
| Timing EVO @ 1.00mm valve lift | – | 55 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 3 ATDC |
| Suggested centre lines | Variable / VVT | 116° |
| Valve lift at TDC | – | 1.27 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
- Nissan Skyline R34 25GT Turbo, RB25DET NEO (1998–2002)
- Nissan Stagea WC34 RS Four / RS V, RB25DET NEO (1998–2001)
- Nissan Laurel C35 RB25DET NEO (1998–2002)
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 |
