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CAMSHAFT SET PONCAM EJ255/257 SINGLE AVCS 254-10.30

parts # TA301A-SB02A
msrp $880.00
engine SUBARU EJ25 SINGLE AVCS
model SUBARU WRX, SUBARU WRX STI
main category HEAD RELATED
sub category CAMSHAFT
shipping size 29 x 8 x 5 inch / 72 x 19 x 13 cm
shipping weight 23 lbs / 11 kg
qty in stock 12
note In Stock Now!

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Item Description

ENGINEEJ25 SINGLE AVCS
MODELWRX 2004-2007
IN/EXINEXINEX
DURATION254272
CAM LFIT10.311.010.8
PART NO.TA301C-SB02ATA301E-SB02ATA301C-SB02BTA301E-SB02B
SET PART NO.TA301A-SB02ATA301A-SB02B
REQUIRED
PARTS
VALVE
SPRING
PART NO.
TA304A-SB01ATA304A-SB01A
VALVE
LIFTERS
PART NO.
OEMOEM
VALVE
SHIMS
PART NO.
  
CAMGEARS
PART NO.
OEMLH:TA302F-SB01A
RH:TA302G-SB01A
OEMLH:TA302F-SB01A
RH:TA302G-SB01A

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.

valc_gluf.jpg

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)

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) 

cam_lifter_01_s.jpg
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

a.jpg