![]() ![]() Note the pushrod guide plates in the left photo. “However, the accelerations are moving the opposite direction to achieve even shorter seat timing with more area. That said, I do not see a day where we would desire a real ‘zero’ opening and closing velocity as would be required at zero lash.” “As valvetrain systems have become more rigid and allow for higher accelerations, opening and closing velocities have counterintuitively migrated down a bit,” continues Godbold. “Hence, you would like to be able to control both the opening and closing velocity of the system as the valve opens and closes. With zero lash, the system would be forced to have zero velocity at opening and closing, and this would limit engine performance. “We’re talking opening and seating velocity. Typically, with any collision exhibiting elastic characteristics, you want to make contact with non-zero relative velocity,” says Godbold. There’s an adjustment nut and a locking screw that work together to properly position the rocker. Perhaps the most popular method of adjusting valve lash is with a polylock on a stud-mounted rocker.
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