Why does a car with a high lift cam and roller rockers sound like a sewing machine?

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  • Why does a car with a high lift cam and roller rockers sound like a sewing machine?


Answer #1 | 08/02 2014 10:50
Generally speaking a long duration high lift cam will either have roller hydraulic lifters which require a very narrow rocker arm adjustment for proper high bleed-off roller lifter adjustment. It's very important for the person who built the engine to use a mechanical devise to be able to pick out the proper push-rod length and new adjustable push-rod guide plates from Comp Cams. 99% of the time with a cam change, different push rods must be changed so the *roller rocker arm tip that rolls over the end s or the valves *stay in the end valve as much as possible. What you may be hearing is a mechanical solid or roller lifter camshaft. You will hear a mild click, click, click because you have to adjust the rocker arm so the roller in the end of the rocker-arm that pushes the valve has .012 - .025. clearance when the rocker-arms are adjusted.
Positive: 68 %

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