Tomei

Tomei PONCAM Intake Camshaft 254 Duration 9.15mm Lift Nissan Skyline GT-R R32 R33 R34 RB26DETT TA301C-NS05A

SKU: TA301C-NS05A
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$332.00
-2% $340.00 $332.00

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Tomei PONCAM Intake Camshaft 254 Duration 9.15mm Lift Nissan Skyline GT-R R32 R33 R34 RB26DETT

-
NISSAN RB26DETT CAMSHFT
 
IN
EX
■ Pre-set valve timing
■ Works best with 'bolt-on' type turbos
■ Stable idle
■ Compatible with stock valve springs
■ Noticable, linear gains in performance
SINGLE MSRP＄340.00(USD)
SET MSRP＄680.00(USD)
*Sold as a set of 2 (IN and EX)
Duration
(° )
Max cam
lift
（mm）
Application
IN/
EX
Single P/N
Set P/N
254
9.15
BNR32/ BCNR33
IN
TA301C-NS05A
TA301A-NS05A
EX TA301E-NS05A
BNR34
IN
 TA301C-NS05A TA301A-NS05B
EX TA301E-NS05B
262
9.15
BNR32/ BCNR33
IN
 TA301C-NS05B TA301A-NS05C
EX TA301E-NS05C
BNR34
IN
 TA301C-NS05B
TA301A-NS05D
EX
TA301E-NS05D
262
10.25
BNR32/ BCNR33
IN
 TA301C-NS05F TA301A-NS05L
EX TA301E-NS05L
BNR34
IN
 TA301C-NS05F
TA301A-NS05M
EX TA301E-NS05M
Duration
(° )
Max cam
lift
（mm）
IN/
EX
Max
valve lift
（mm)
Cold valve
clearance
（mm）［±0.01］

Valve timing
center
Line (° )
Base
circle
(Φ)
Stock
valve spring
compatible
 Stock
valve Lifter
compatible
254
9.15
IN
8.70
0.45
110
32.0
√
√
EX
8.77
0.38
115
262
9.15
IN
8.70
0.45
110
EX
8.77
0.38
115
262
10.25
IN
            
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：LOW
・LIFT：LOW
・AIR INTAKE：LOW		   ・CAM ACCELERATION：HIGH
・LIFT：HIGH
・AIR INTAKE：HIGH
Unlike the valve opening, the VALC profile ensures that the valves close at a slower rate, helping to prevent common valve train related issues.
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.
Conventional profile based on lifter size/radius.
'VALC' profile.
''VALC' profile + additional lift.
Lift comparison between a conventional profile and 'VALC' profile.
 Conventional profile
 'VALC' profile
 'VALC' profile + additional lift.