Kelford camshafts, Toyota 4A-GE 20V (1991-2001)

Kelford camshafts, Toyota 4A-GE 20V

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 Toyota 4A-GE 20V engine. Profile differences, spring recommendations and required modifications are detailed below.

Technical specifications – available profiles for this engine

Profile 194-A

Stage 1 for a mildly tuned naturally aspirated 4A-GE 20V with basic intake and exhaust upgrades. Adds mid-range pull while retaining street driveability and intake VVT. Recommended springs: KVS51-B.

Manufacturer profile information

Profile 194-B

For a mildly modified naturally aspirated 4A-GE 20V used in rallying or circuit racing. Adds mid-range and top-end pull up to approximately 8,500–9,000 rpm. Intake and exhaust upgrades are recommended. Retains intake VVT.

Manufacturer profile information

Profile 194-C

Naturally aspirated race profile for increased compression, a mildly ported head and suitable intake and exhaust parts. More top-end pull than 194-B, working to around 9000–9500 rpm depending on the build. Suits circuit or rally cars with close-ratio gearing. Kelford recommends removing intake VVT and using fixed timing with adjustable cam gears. Recommended springs: KVS51-B.

Manufacturer profile information

Profile 194-D

Naturally aspirated race profile for high compression, a ported head and suitable intake and exhaust parts. Also suits a 7A-based bottom end. More top-end pull than 194-C, working to around 10000 rpm depending on the build. Kelford recommends removing intake VVT and using fixed timing with adjustable cam gears. Recommended springs: KVS51-B.

Manufacturer profile information

Profile 194-E

For a high-rpm naturally aspirated 4A-GE 20V racing engine with high compression and a ported head. Suitable for 7A-based rotating assemblies and stroker kits. More top-end pull than 194-D, extending beyond 10,000 rpm. Intake VVT deletion and fixed timing with adjustable gears are recommended.

Manufacturer profile information

Profile 194-TA

For a turbocharged 4A-GE 20V with a 46–54 mm turbo. Retains street manners and intake VVT. Adds mid-range and top-end pull compared with factory cams and suits E85. Recommended spring upgrade: KVS51-B.

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

• Toyota Corolla Levin / Sprinter Trueno AE101, Silver Top (1991–1995)
• Toyota Corolla Levin / Sprinter Trueno AE111, Black Top (1995–2000)
• Toyota Corolla/Sprinter AE101/AE111 4A-GE 20V (1991–2000)
• Toyota Carina AT210 GT 4A-GE Black Top (1996–2001)
• Toyota Sprinter Carib AE111 BZ Touring, 4A-GE Black Top (1996–2000)

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.

Kelford Cams