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-   -   Roller Rockers on Stocker Engine ? (https://classracer.com/classforum/showthread.php?t=18244)

Bill Edgeworth 06-08-2009 02:26 PM
Re: Roller Rockers on Stocker Engine ?
 
Quote:
Originally Posted by randy wilson (Post 124412)
pushrod length does not change valve lift or duration. only cam profile, rocker ratio, and valve lash can do that.
Randy,
You are incorrect. It especially affects punched steel (non roller tip) rockers. When you use a long pushrod it brings the short side of the fulcrum closer to center effectively increasing rocker ratio. It affects roller tip rockers less because the tip radius is much smaller compared to the pad on a punched steel rocker.

Alan Roehrich 06-08-2009 05:18 PM
Re: Roller Rockers on Stocker Engine ?
 
Quote:
Originally Posted by randy wilson (Post 124412)
pushrod length does not change valve lift or duration. only cam profile, rocker ratio, and valve lash can do that.
Pushrod length directly effects valvetrain geometry, thereby directly effecting rocker ratio, and from there it effects lift, and duration.


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