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TOMEI

Tomei PROCAM RB25DE(T) R33(97.9-) EX 256-8.5mm

Tomei PROCAM RB25DE(T) R33(97.9-) EX 256-8.5mm

SKU: 1419256085
£272.08
£272.08
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Some items may take 3-5 days to ship.

PRODUCT INFO



TYPE APPLICATION DURATION（°） MAX CAM LIFT（mm） IN/EX P/N
ENGINE MODEL IN EX IN EX
RB25DE(T) R33(1st),WGNC34(1st),C34 256 256 8.50 8.50 IN & EX Set 143020
R33(2nd) WGNC34(2nd)) 143050
A R34,WGNC34(3rd)
NEO straight 6(exclude RB25DE)		 252 252 9.15 9.15 IN & EX Set 143046
B 260 260 IN & EX Set 143023
RB20DE(T) 256 256 8.50 8.50 IN & EX Set 143019

※PRESET VALVE TIMING
※STOCK VALVE SPRING COMPATIBLE
※WGNC34: 1st;1996.10 - 2nd;1997.9 - 3rd;1998.8.31 -
※ECR33: 1st;1993.8 - 2nd;1997.9 - (changed crank angle sensor)



APPLICATION DURATION（°） MODEL MAX CAM LIFT（mm） IN/EX P/N NOTE
RB25DE(T) 256 R33(1st),WGNC34(1st),C34
LASH TYPE		 8.50 IN 1415256085 same as PONCAM
EX 1412256085
R33(2nd),WGNC34（2nd）
LASH TYPE		 IN 1415256085
EX 1419256085
252 R34,WGNC34(3rd)
NEO straight 6(exclude RB25DE)
GENUINE SOLID TYPE		 9.15 IN 141D252091
EX 1426252091
260 9.15 IN 141D260091
EX 1426260091
SOLID TYPE
(NOT COMPATIBLE WITH NEO STRAIGHT 6)		 9.25 IN 1417260092 ※Special valve spring、solid lifter、and adjust shim are required.
EX 1418260092
R33(2rd),WGNC34(2nd) 1419260092
10.25 IN 1417260102
EX 1418260102
R33(2rd),WGNC34(2nd) 1419260102
270 9.25 IN 1417270092
EX 1418270092
R33(2rd),WGNC34(2nd) 1419270092
10.25 IN 1417270102
EX 1418270102
R33(2rd),WGNC34(2nd) 1419270102
RB20DE(T) 256 LASH TYPE 8.50 IN 1411256085 same as PONCAM
EX 1412256085
260 8.80 IN 1411260088
EX 1412260088
270 8.80 IN 1411270088
EX 1412270088
260 SOLID TYPE 9.25 IN 1417260092 ※Special valve spring、solid lifter、and adjust shim are required.
EX 1418260092
10.25 IN 1417260102
EX 1418260102
270 9.25 IN 1417270092
EX 1418270092
10.25 IN 1417270102
EX 1418270102

FEATURE / SPEC



●About types for RB25 NEOstaight6

・ Type A
In order to get stable idle and raise low-mid RPM torque, we set the duration of EX camshaft shorter.
Best suit used with stock turbine or N1 turbine.

・Type B
By giving longer duration timing than type a, it eables to raise both response and peak power at the same time, even with mid-large sized turbine.


■ SPEC
ENGINE Duration Max Cam lift (mm) IN/EX Max Valve lift （mm） Cold Valve Clearance
（mm）［±0.01］		 Valve Timing Centerline
(Deg)		 Base circle Note
RB25DE(T) 252 9.15 IN 8.70 0.45 120 32 PONCAM
R34 NVCS
EX 8.70 0.45 115 PONCAM
256 8.50 IN 8.50 – 120 PONCAM
R33 LASH NVCS
260 9.15 IN 8.70 0.45 120 PONCAM
NVCS
EX 8.70 0.45 115 PONCAM
RB25DE(T)
RB20DE(T)		 256 8.50 EX 8.50 – 115 32 PONCAM
LASH
260 9.25 IN 8.80 0.45 110 29 SOLID
EX 8.87 0.38 115
10.25 IN 9.80 0.45 110
EX 9.87 0.38 115
270 9.25 IN 8.80 0.45 110
EX 8.87 0.38 115
10.25 IN 9.80 0.45 110
EX 9.87 0.38 115
RB20DE(T) 256 8.50 IN 8.50 – 115 32 PONCAM
LASH
260 8.80 IN 8.80 – 115 LASH
EX 8.80 – 115
 270 8.80 IN 8.80 – 115
EX 8.80 – 115


Theme of TOMEI CAMSHAFT

Asymmetrical G-Controlled Profile

When opening the intake valve during high acceleration the G from the camshaft requires to send as much mixture to the cylinder in the shortest time possible. However if the speed is too high it can damaged the Valves, Valve Seats and Valve Springs if the Acceleration G is too high. The Asymmetrical profile design given to the camshafts will allow the Intake and Exhaust Valves to fulfill the target requirement with the wider duration and high lift without damaging the Valve System.

Maximizing the Valves Efficiency



The general purpose of engine tuning is to change the torque characteristics of the engine by changing the cams duration timing and cam lift amount for maximum torque and horse power. However tuning the engine is not only based on that. When going into finer details by maximizing the Valves efficiency is not just about timing and height lift but to also maximize the intake efficiency. The high valve lift allows huge amounts of air in but at the same time it mechanically damages the valve train and gains added friction loss. Longer cam durations and big cam lifts give deliver more power at higher engine speeds but it also gives a rough idle and at low engine speeds. Tomei engineers worked hard to produce camshafts that will deliver a well balanced profile at 1.3-1.5 times more than the stock camshaft.

Quality Control

Every camshaft is carefully built through these production processes. Plus, strict inspection will be given to them and only the highest quality products are shipped.

Surface Coating


Coating the surface of camshaft with manganese phosphate in order to protect from damage even when the camshaft has not lubricated yet. This has done by steeping press process that produces 0.5mm to 15 micromillimeter thin of manganese phosphate coating on its surface to prevent from direct contact with other metal parts while realizing smooth operation.

CNC Super Precise High Speed Grinding



The combination of a ultra high-speed main bearing and diamond grindstone is controlled by the computer. By using the same special-purpose machine as an automaker, high precision grinding is realized though in 1/3 period of time. Consequently, incredible accuracy of profile and remarkable price were realized at the same time.

Wavy Groove Finish by Oscillation Grinding

Wavy groove is curved to the cam profile surface by oscillation during cam grinding process. Oil pool that is formed on the cam profile surface reduces a friction loss and prevents locking.



Factory Camshaft specs


Model Engine Type Cam Duration/IN (°) Cam Duration/EX (°) Cam lift/IN (mm) Cam lift/EX (mm) Pre-Set Valve Timing/IN (°) Pre-Set Valve Timing/EX (°) NVCS NVCS range(rpm)
R31 RB20DET Lash 248 240 7.80 7.80 108 118 None
HCR32 RB20DE Lash 232 240 7.30 7.80 111 117 None
RB20DET 240 240 7.80 7.80 115 120 None
RB25DE 240 232 7.80 7.30 111 118 None
ECR33 RB25DE Lash 240 240 7.80 7.80 120 117 ○ 1050～5700
RB25DET 240 240 7.80 7.80 120 117 ○ 1050～4500
ER34 RB25DE Solid 236 232 8.40 6.90 119 115 ○ Below 5700
RB25DET 236 232 8.40 8.70 119 115 ○ Below 5400
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