Head and Valvetrain
The Mazda FE-DOHC uses a wide-angle, DOHC, belt-driven valvetrain configuration with flat-tappet 33 mm HLA bucket lifters. It is a non-interference design. There are two valve springs per valve and four valves per cylinder. While a dual valve spring configuration is used, the stock springs are fairly low-sprung. Low spring rates were chosen for increased valvetrain longevity and low friction with the dual valve springs for the reduction of harmonics and increased valve stability. It is advised to increase the spring rate for turbo and high-RPM applications.
Read more about this topic: Mazda FE-DOHC Engine
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