Description

Tomei Valve Spring SR20DE(T)

Tomei typically has stock available the same day. (Their factory/ warehouse is 5 minutes around the corner from us.) However, we will let you know if there are backorders or any delays. If you are looking for parts that are not on our website or want to place a bulk stock order, please contact us via the contact form.

 

High quality designed springs is required to transfer the exact movement of the camshaft to the valves at high engine speeds on high performance engines. The TOMEI products are always engineered with precision in mind to suit the user’s needs. So with this in mind careful choices in material selection is made with surface coating and other technologies. Then the pre-production products are put through an extensive testing program for checking durability, quality and performance. We spend time and money to help you save your valuable time and money.

 

PRODUCT INFO

APPLICATION TYPE COMPATIBLE LIFT(mm) P/N NOTES
SR20DE(T)
 A ～12.50 173004
B ～12.50 163055
Double springs and special titanium retainers With spring seats
RNN14 ～12.50 13203R301
Double Spring (Discontinued)

 

FEATURE / SPEC

DIA METER FREE LENGTH(mm) SET LENGTH LIFT LENGTH COMPRESSED LENGTH SET LOAD LIFT LOAD MATERIAL PROCESS
A TYPE Φ4.00mm 48mm 40mm 27.5kgf 26.5kgf 25.6±7% 81.6±7%
B TYPE
 INNER Φ2.50mm 35.2mm 32.2mm 19.7kgf 18.7kgf 3.4±8% 23.4±8%
OUTER Φ4.00mm 48mm 40mm 27.5kgf 26.5kgf 25.6±7% 81.6±7%
COMBINED 29.0±8% 105.0±8%
RNN14
 INNER Φ2.30mm 43.3mm 31mm 19kgf 17.5kgf 9 24
OUTER Φ3.80mm 46.4mm 38mm 26kgf 24.4kgf 20 60
COMBINED 29 84

 

â–  Multi Coil Unequal Pitch Springs
By combining several steps of spring rates into the one spring and vibration frequency becomes amazingly high. This greatly minimizes resonance and the chances of surging.

 

â–  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 even further. 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 the engines speeds RPM limit.

â–  Shot Peening
A process that strikes many small steel balls onto the surface of the spring at high speeds 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.

â–  Warm Setting
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.

â–  Nitriding
The surface treatment method for making nitrogen permeates the spring and gives it large surface compression repulsion. This method was chosen to raise the fatigue limit to suit the demands or running high lift camshafts. The dangers of spring failure is greatly reduced with the 1.5 times increase in the springs fatigue limit with the combined use of Oil tempered chromium-silicone alloy steel wire and Nitriding. This is how our valve springs are suitable for use on extreme engine speed conditions of super-high revs exceeding 10,000 RPM which had not been previously possible with high lift camshafts.