Quote:
Originally Posted by RocktimusPryme
Let me rephrase slightly. Is it a useful question to ask when putting together a top end "What is my lightest spring I can safely run to meet goals here?" And go with that spring.
On the surface to me it seems like having valve float slightly earlier than you want, is a better option than increased likelihood of catastrophic valvetrain failure.
This particular debate not withstanding, I have become a big believer that most classic motor builds probably run too much spring in general. No matter the cam type.
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Worthwhile question.
To answer it regarding acceleration and inertial forces from an aggressive lobe, the following page gives an explanation and has a link to a downloadable xl spreadsheet tool. You will need the lobe profile's deceleration over the nose (I took a few data points on mine with a degree wheel and then took 2 derivatives). But it gives your spring force "margin" over the nose, in my case I had about 175 lbf at 6k rpm left over (or about 30% margin). Prob could go with less spring for me
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