■Optimized 'velocity' and 'acceleration'.

■Designed for high power setups.

■Optimizes engine performance.

■Higher lift than other profiles of the duration.

■Reduced stress/wear on the valve train.

1⃣

The VALC profile allows the valves to open faster and for longer. This translates to faster lift and increased area under the 'lift curve' (see fig. ①) which in turn generates more power. (Greater area under the 'lift curve' = greater air intake)

①
CAM ACCELERATION		CAM ACCELERATION
LOW		HIGH
LIFT		LIFT
LOW		HIGH
AIR INTAKE		AIR INTAKE
LOW		HIGH

2⃣

Unlike the valve opening, the VALC profile ensures that the valves close at a slower rate, helping to prevent common valve train related issues.

3⃣

With a conventional direct-acting valve train, the maximum lift is usually determined by the size/diameter of the valve lifter. Selecting a high-lift camshaft without taking this into consideration often results in the camshaft lobes travelling beyond the surface of the valve lifter. This causes the lobe to make contact with the edge of the lifter, damaging both components over time. （see fig. ②）

Therefore, the ideal performance orientated high-lift camshaft needs to have a profile that maximizes lobe travel on the lifter without exceeding the outer edge.

VALC profile camshafts have achieved this ideal by deliberately reducing the maximum cam velocity to limit lobe travel on the lifter surface.　（Maximum cam velocity = lobe travel distance on lifter)　

②

High lift profile without taking lifter size/radius into account.

Compared to standard profile camshafts of the same lift, VALC profile camshafts are able to then then off-set the difference for even greater lift/performance gains

Poncam Single AVCS Camshaft Set 258/266 for 1998-2000 Subaru WRX STI w/ EJ207 by Tomei

With a conventional direct-acting valve train, the maximum lift is usually determined by the size/diameter of the valve lifter. Selecting a high-lift camshaft without taking this into consideration often results in the camshaft lobes travelling beyond the surface of the valve lifter. This causes the lobe to make contact with the edge of the lifter, damaging both components over time. Therefore, the ideal performance orientated high-lift camshaft needs to have a profile that maximizes lobe travel on the lifter without exceeding the outer edge. VALC profile camshafts have achieved this ideal by deliberately reducing the maximum cam velocity to limit lobe travel on the lifter surface.

Please Note: This product has a number of parts which are required to be used in tandem with these camshafts which are not included in this kit. Below is a comprehensive list based on part type:

Valve Spring: OEM or TA304A-SB01A

Features

• Intake Duration: 258
• Exhaust Duration: 266
• Intake Cam Lift: 9.60
• Exhaust Cam Lift: 9.80

Benefits

• Optimized 'velocity' and 'acceleration'
• Designed for high power setups
• Reduced stress/wear on the valve train

Applications

• 1998-2000 Subaru STI EJ207 w/ Single AVCS only

What's In The Box?

• 1 - Camshaft or Set of Camshafts

References

• Tomei's Part Guide