New Noise
02-04-2009, 02:23 PM
#1
New Noise
Tap,tap,tap,...........Tap,tap,tap,............Tap ,tap,tap,............Tap,tap,tap,............
At about 1700 rpm it is the most noticeable. Three taps, at the same speed you would knock on a door, then a pause for the same amount of time. I got up on top of the engine, and it seems to be centered in the engine, deep.
At 1900 rpm there might be four taps, at 1200 two.
I've always had a very noisy valve train, I never adjusted it since new, and now I won't be able to do anything until it gets warm outside. The cadence of this new noise is just plain weird.
Comp Hyd 222 224 .566 .568 115 LSA, Comp 875 roller lifters, Comp 3153 timing chain set, Comp 13753 roller rockers, Comp 3/8" x 7.500" pushrods.
At about 1700 rpm it is the most noticeable. Three taps, at the same speed you would knock on a door, then a pause for the same amount of time. I got up on top of the engine, and it seems to be centered in the engine, deep.
At 1900 rpm there might be four taps, at 1200 two.
I've always had a very noisy valve train, I never adjusted it since new, and now I won't be able to do anything until it gets warm outside. The cadence of this new noise is just plain weird.
Comp Hyd 222 224 .566 .568 115 LSA, Comp 875 roller lifters, Comp 3153 timing chain set, Comp 13753 roller rockers, Comp 3/8" x 7.500" pushrods.
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02-06-2009, 07:14 PM
#10
I tried taking a video several times, it is too dificult to distinguish the noise. I even videoed inside while I was driving, then all you can hear is exhaust noise and tire tread noise. My tires are as quiet as any car's, and my exhaust is stock. It's weird how cameras decide how to equalize the sound. The noise is so obvious to my (nearly) human ears.
It sounds like somebody tapping on the inside of the aluminum intake manifold with a 10mm wrench, in the cadence I described in the first post.
It sounds like somebody tapping on the inside of the aluminum intake manifold with a 10mm wrench, in the cadence I described in the first post.