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I’m it a guru by any means but here’s my experience. When (trying to) time my cams using the one-rocker technique, per Wayne’s book, I was plagued by cam “snap back.” After making the initial setting when I removed the pin to rotate the crank back to Z1 the cam would immediately and instantly rotate off the setting. This is because of the valve spring tension (operating through the rocker) acts on the cam lobe, rotating the cam.
Someone on this forum, Bruce I think, suggested installing all of the other rockers with the adjusters backed off. Voila problem solved. All those other springs and rockers applied enough pressure on other lobes to counter-balance the forces and the cam stayed in place. Cured my frustration!
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“As new technologies become indistinguishable from magic, and I can no longer tinker, the magic goes away for me.”
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