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Kelford camshaft, Sea-Doo Rotax 1503/1630 4-TEC
1 143,00 €
Kelford camshaft for the Sea-Doo Rotax 1503/1630 4-TEC 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 Sea-Doo Rotax 1503/1630 4-TEC engine. Profile differences, spring recommendations and required modifications are detailed below.
Technical specifications – available profiles for this engine
Profile 232-A
Stage 1 for Sea-Doo 1503/1630 Rotax 4-TEC engines. Adds pull up to the factory rev limit. Designed for standard springs and compatible with RET03-STD titanium retainers. Lobe separation: 116°.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 5.99mm | 5.99mm |
| Rocker ratio | 1.72 | 1.72 |
| Net valve lift | 10.30mm | 10.30mm |
| Advertised duration @ 0.10mm | 276° | 282° |
| Duration @ 1.00mm valve lift | 230° | 236° |
| Timing IVO @ 1.00mm valve lift | 1 ATDC | – |
| Timing IVC @ 1.00mm valve lift | 51 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 54 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 2 ATDC |
| Suggested centre lines | 116° | 116° |
Manufacturer profile information
Profile 232-B
Stage 2 for a Sea-Doo 1503/1630 Rotax 4-TEC with an upgraded supercharger. With KVS03 springs, the manufacturer specifies operation up to 25 psi and 9,500 rpm. Lobe separation: 118°.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 6.28mm | 6.10mm |
| Rocker ratio | 1.72 | 1.72 |
| Net valve lift | 10.80mm | 10.50mm |
| Advertised duration @ 0.10mm | 282° | 290° |
| Duration @ 1.00mm valve lift | 236° | 240° |
| Timing IVO @ 1.00mm valve lift | 2 ATDC | – |
| Timing IVC @ 1.00mm valve lift | 58 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 56 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 4 ATDC |
| Suggested centre lines | 120° | 116° |
| Valve lift at TDC | 0.90mm | 1.40 mm |
Manufacturer profile information
Profile 232-C
Turbo profile for over 300 hp with a 48–54 mm turbo. Intended for high rpm and boost. At around 10000 rpm, KVS03 springs and titanium retainers are required.
| Specification | Intake | Exhaust |
|---|---|---|
| Cam lift | 6.40mm | 6.25mm |
| Rocker ratio | 1.72 | 1.72 |
| Net valve lift | 11.00mm | 10.75mm |
| Advertised duration @ 0.10mm | 286° | 294° |
| Duration @ 1.00mm valve lift | 240° | 244° |
| Timing IVO @ 1.00mm valve lift | 0 TDC | – |
| Timing IVC @ 1.00mm valve lift | 60 ABDC | – |
| Timing EVO @ 1.00mm valve lift | – | 58 BBDC |
| Timing EVC @ 1.00mm valve lift | – | 6 ATDC |
| Suggested centre lines | 120° | 116° |
| Valve lift at TDC | 1.00mm | 1.40 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
- Sea-Doo 1503 / 1630 Rotax 4-TEC -engines, 1.5/1.6-litre four-stroke models
| Weight | 10 kg |
|---|---|
| Brand |
