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Tomei Japan Valve Spring Kit Fits Nissan Silvia S13 CA18DET
Genuine Tomei Japan ProductHigh 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.
Applications:
Diameter: Φ3.90
Free Length: 41.0
Set length: 35.0
Lift length: 25.0 Compressed length: 24.0Set load: 24.0±7% Lift load: 80.6±7%
Material: SWOSC-VX
Process: Nitride
Colour ID: BLUE
■ 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.
■ 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.
■ 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.
■ 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.
■ 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.
■ Nitriding Using highly durable oval wire allows the valve springs to compress even further whilst still retaining sufficient force. Compatible with many high lift camshafts, these springs provide reliable performance even under load at higher RPMs.
Terminoligy
【Surging】
The Phenomenon which material of the valve spring resonance and causes the spring itself to vibrate violently.
【Jump】
The Phenomenon that the valve rallies to the cam surface instead of
settled back. It happens when the valve cannot follow the camshaft
rotation and lifted irregally.
【Bounce】
The Phenomenon that the valve is bouncing repeatedly from valve seat other than sticking to it when it is closing.
【Fatigue】
Breakage that occurs during the repeat operation of the spring. (The larger lift, the more possibilities to get fatigued)
【Sag】
The Phenomenon in which the load (free play) of a spring decreases while
inuse. It is related to the maximum stress under operation and use
time.
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- We ship all items within 3 working days unless otherwise specified.
- The listing delivery price is for shipping to the Mainland UK ONLY. This does not include Channel Islands, Northern Ireland and Scottish Highlands. Please contact us for a shipping quote to these destinations or any overseas destinations. Shipping, Handling and Insurance Fees are not negotiable.
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- We will ship worldwide, please email us your complete address for a quote.
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- You will be required to sign for your parcel when it is delivered. If you are not at home when the parcel arrives, a card will be left for you to arrange an alternative delivery date with the courier.
- What can I do if the item I've received is not as described or damaged?
Please contact us as soon as possible to make us aware of a problem, we'll do our best to solve this for you as quickly as we can.
- When will you post my item?
Within 3 working days, unless otherwise specified.
- When will I receive my item?
All Mainland UK orders are dispatched by Royal Mail First Class or City Link, depending on the size and weight of the item. You should receive your item within 1 - 2 days of dispatch. For all Offshore and International orders please contact us to find out the delivery time to your country.
- Can I ask for a refund or replacement if I haven't received my item?
If your item has been sent my Royal Mail you should allow 15 days from the date of dispatch before an item is considered lost. If your item has been shipped by City Link please contact us within 1 - 2 days. If you have any queries regarding your delivery please contact us.
- Can I ask for a refund or replacement if I'm not satisfied with the item I've received?
According to the Distance Selling Regulations you have 14 working days from the day you receive the item to cancel your order. We allow 14 DAYS for you to cancel your order and return it to us, return postage is to be paid for by yourself and we recommend suitable insurance. Once the item has been returned and checked over we will issue a refund EXCLUDING the cost to us of the original delivery charge, even if the item is listed with Free Delivery.
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