DC526-2460 – Valve Spring Kit, S63 High Performance Valve Springs

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CarBahn solution

We include high performance valve springs with our engine, however you can purchase the springs separately. Our springs increase valve spring pressure by 20%. We also keep the steel retainers for long term durability.

Additional Information

Steve Dinan has been building racing and high performance road car engines for over 40 years. We are concerned about the trend in high performance valve springs on the new S63 engines. Companies are selling springs with very high spring rates that will rob power and dramatically increase valve train wear.

Theory

The goal of a valve spring pressure is to make it as low as possible. This is because compressing a spring takes energy and robs potential power. In addition, more valve spring pressure increases valve train wear. We work very hard at running just enough valve spring pressure to keep the follower in contact with the camshaft but no more. If you increase the RPM you increase the valve spring just enough to manage the inertia from the increased RPM. The valve spring also needs enough seat pressure and the correct frequency not to bounce when the valve is closed. This is to avoid leaking trapped mass (the fuel air charge).

Boosted engine

With a boosted engine you will need a slight increase in pressure to push back against the boost pressure in the intake trying to hold the valve open. This amount of pressure added is much less than the pressure to control the inertia of the valve train.

Conclusion

If you double the boost pressure you do not need to double the spring pressure since only about 20% of the spring pressure is to control the boost pressure and 80% is to control the valve train mass. An additional 20% of valve spring pressure is all you need to run.

FITS

• 2012-2018 BMW M6 Base Convertible
• 2012-2018 BMW M6 Base Coupe
• 2012-2023 BMW M5 Base Sedan
• 2014-2016 BMW M5 Competition Pkg. Sedan
• 2014-2018 BMW M6 Competition Pkg. Convertible
• 2014-2018 BMW M6 Competition Pkg. Coupe
• 2014-2019 BMW M6 Base Gran Coupe
• 2014-2019 BMW M6 Competition Pkg. Gran Coupe
• 2015-2018 BMW X5 M Base SAV
• 2015-2019 BMW X6 M Base SAV
• 2019-2023 BMW M5 Competition Sedan
• 2020 BMW M8 Base Convertible
• 2020 BMW M8 Base Coupe
• 2020-2021 BMW M8 Base Gran Coupe
• 2020-2024 BMW M8 Competition Coupe
• 2020-2024 BMW M8 Competition Gran Coupe
• 2020-2024 BMW M8 Competition Convertible

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