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why does exhaust manifold rattle only during acceleration?

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Old 12-26-2005, 08:32 PM
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why does exhaust manifold rattle only during acceleration?

1992 SE w/ cracked manifold studs:

why does it only rattle during acceleration? I would think that the exhaust pressure would depend on the RPMs only, regardless of whether the RPMs are increasing or remaining constant. or does it depend on vibration from the torque?
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Old 12-26-2005, 08:39 PM
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i would think the torque and twisting of the motor.. or maybe the backpressure that the exhaust creates
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Old 12-27-2005, 04:46 AM
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rotational forces (AKA torque and twisting)
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