I noticed the same thing about Spring pressure that info is not correct. Even so it is a good video with some good entry level info. His second video on the same subject is also very good and a little more advanced. On that video he talked a lot about exhaust scavenging but least out an important aspect of it, specifically how the exhaust gas during overlap will actually pull in the intake charge during overlap. This is how a naturally aspirated engine can exceed 100% VE
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Tim Corcoran
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