NEWRELEASEINFORMATION
Vol.346

VALVE SPRING

wed！
ene！
5:
RVQ3 cam lift
highrofdsuiteuct！
dorpd
New 2JZ:
irclec、2
1JZ D baseor ST& stock！
fel
icab
fts
Appl camsha

Photo:VQ

Renewal & long-awaited new lineup!！
TOMEI's R&D concept on production technology , such as materials used, surface treatments and much more, is always
refined and of the latest technology in the industry.Our strict thorough quality control methods and testing methods areapplied to each Valve Spring off the production line.High power generating engines which operate at high engine
speeds require precision durable vale springs to suit the aggressive performance camshaft profiles thar are used.

Warm Setting

Multi Coil Unequal Pitch Springs
Progressive Unequal Pitch

By combining several steps ofspring rates into the one spring andvibration frequency becomesamazingly high. This greatly
minimizes resonance and thechances of surging.

Advanced Oil Tempered Chromium-silicone Alloy Steel Core
Oil tempered chromium-silicone alloy steel wire is used which is considered to be
the best material for springs for performance applications and evolved it evenfurther. Combined with a new optimized design, not only did we make it tougher,
we also succeeded in suppressing valve jumps or bounce even when raising theengines speeds RPM limit.

The process that is adding higher loads beyond the actual limits to the highly
heated spring. This will modify its shape and keep it permanently fixed. We
succeeded in securing the highest performance over a long period of time while
preventing sagging.

Nitriding
VALVE SPRING FATIGUE LIMIT

Oscillation Amplitude(ra)Equal Pitch

StandardForce(rm)Shot Peening

A process that strikes many small steel balls onto the surface of the spring at highspeeds is made to enhance the surface of the spring to raise its fatigue limit.
Although it has been carried out earlier during the manufacturing process.

APPLICATION

P/N

VQ35DE/HR

163063

1JZ-GTE

1630612JZ-GTE

163062JPY

The surface treatment method formaking nitrogen permeates thespring and gives it large surface
compression repulsion. Thismethod was chosen to raise thefatigue limit to suit the demands or
running high lift camshafts. Thedangers of spring failure is greatly
reduced with the 1.5 times increasein the springs fatigue limit with thecombined use of Oil tempered
chromium-silicone alloy steel wireand Nitriding. This is how our valve
springs are suitable for use on
extreme engine speed conditions ofsuper-high revs exceeding 10,000
RPM which had not been previously
possible with high lift camshafts.

NOTES

39,00036,000Oval wire core suited for high cam lift
Applicable for STD base-circled camshafts & stock Outer Shim system
Oval wire core . Applicable for STD base-circled camshafts & stock Outer Shim system

SPECDIA METER FREE LENGTH SET LENGTH COMPATIBLE LIFT LIFT LENGTH COMPRESSED LENGTH SET LOAD LIFT LOAD（ｍｍ）

VQ35DE/HR 3.05×3.80

（kgf）

（kgf）

MATERIAL PROCESS COLOR

（ｍｍ）

（ｍｍ）

（ｍｍ）

（ｍｍ）

（ｍｍ）

46.2

37.0

〜11.5

25.5

21.5

21.8±7% 57.5±7% NHK620 Nitride Yellow

1JZ-GTE

Φ3.90

41.0

34.5〜10.25

24.5

22.5

21.7±7% 74.5±7% SWOSC-VX Nitride Blue

2JZ-GTE

3.40×4.25

41.6

34.5

〜10.2524.5

21.526.2±7% 72.1±7% NHK507 Nitride L Blue