INTERNAL ENGINE MODIFICATIONS Valvetrain |Heads | Strokers | Design | Assembly

sewing machine sound

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Old Aug 9, 2006 | 08:21 AM
  #21  
reveille5's Avatar
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From: New Orleans
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Anyone had any luck on getting rid of the "sewing machine sound" as a result of a cam swap?

I listned to it today and it is a slight ticking sound. Also as the rpms go higher the sound gets a little faster.

Last edited by reveille5; Aug 9, 2006 at 09:44 AM.
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Old Aug 20, 2006 | 01:38 PM
  #22  
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From: Denton, Texas
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Contact your cam manufacturer and find out if it's lobes are ground on a smaller base circle. It is very common that it is. Comp typically grinds their cams on a .05 smaller base circle, requiring a .025 longer pushrod to maintain the previous rocker arm geometry.
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