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valve spring installed height

Practical Engine Building

Discussion and questions related to the course Practical Engine Building


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I see no mention of checking and correcting valvespring installed height, any specific reason for this?

There was a quick mention of testing 1 rodbolt for correct stretch to see the torque value. Then that value was used for all rod bolts?

When you dont check the length of all rod bolts before installing, how can you decide on the next rebuild if it is still a good bolt. There are stretch limits given by the manufacturer. I am missing this info in the course.

Unfortunately we can't cover every possible topic that relates to engine building within the course. What we usually do to cover specific topics like valve spring installed height is to produce a webinar on the topic. This way we can dive in deep on the topic for those that need to understand it without making the engine building course larger than it already is. In essence though the process is quite straightforward - Measure the valve spring installed height according to the manufacturers recommendations. If the installed height needs to be reduced you can shim the spring base to achieve the desired target height.

With regard to the rod bolts, there are a variety of ways of installing them. In the simplest form is simply using a torque wrench. A better option of course is to use a stretch gauge to essentially test your torque wrench calibration and then rely on the torque wrench. Lastly you can measure and record the stretch on each rod bolt so that you can refer back to this on subsequent tear downs.