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Tomei Procam for R34 RB26DETT Duration 272 Lift 10.25

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TOMEI
$680.00
SKU:
TA301A-NS05F
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 Product Description

*Sold as a set of 2 (IN and EX)

Single P/N :

INTAKE - TA301C-NS05C

EXHAUST - TA301E-NS05F

 
NISSAN RB26DETT CAMSHAFT  
 
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
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
272
10.25
IN
9.80
0.45
110
30.0
*1 or *2
*3
EX
9.87
0.38
115
282
10.80
IN
10.35
0.45
110
EX
10.42
0.38
115
292
11.50
IN
11.05
0.45
110
*2
EX
11.12
0.38
115
*1 TOMEI RB26 TYPE-A Valve Springs required for installation (P/N 173001) .
*2 TOMEI RB26 TYPE-B Valve Springs required for installation (P/N 173002) .
*3 TOMEI RB26 Valve Lifters required for installation (P/N TA307A-NS05A) .
''VALC' profile features- Velocity, Acceleration, Lift, Control
 ■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.
 
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.
PRECISION MACHINING
LOBE HEIGHT
Machining each lobe to the strictest tolerances allows for smoother and more precise adjustments in valve clearances.
Based on: 9.15mm max lift, Φ32 base circle
SPEC. 41.15mm
ACTUAL (avg.) 41.1455mm
DIFFERENCE (avg.) 0.0045mm
DIFFERENCE (%) 0.0001%
The greater this 'difference', the more shims and time required to adjust the valve clearance.
 
PHASE ANGLE
Lobe nose interrelationship (front view)
Strict phase angle tolerances minimizes the risk of valve timing issues and ensures each valve opens and closes precisely.
SPEC. See above
DIFFERENCE (avg.) 0°4′41″(0.078°)
DIFFERENCE (%) 0.0026%
Our research showed that some camshafts from other manufacturers had more than 5 degrees difference in the phase angle! This makes it near impossible to achieve the correct valve timing.
 
 
 
 
   
 

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