On Thu, 30 Nov 1995, Will Zehring wrote:
> This regards the thread on suspected bearing noise and the observation that
> the noise is occuring once per second. Of course its hard to estimate "once
> per second" by ear, but if the engine is at idle, say at 800 rpm, what
> bearing surface is knocking only once per second? The way I figure it, the
> crank is rotating 14 times a second at even 800 rpm. I'm obviously missing
> some thing here (brain? experience?) so any edifying remarks would be
> muchly appreciated.
Oops. Sorry, Will. I wasn't very clear in my description. By "tock tock
tock tock tock" once per second, I meant five tocks per second. This was
just an estimate without a time measurement device. I guess it is
probably 6-7 per at idle. It's definitely not 14 per. Since Denise
posted than rod knock was a two part sound ("knack-a") I would hypothesize
that that second part is being masked by other sounds. If I had the right
equipment I would record it digitally, get the exact frequency, and post
the sound file for better net.analysis.
Kevin Sullivan -- 1960 MGA
Nichols Research Corp.
Shalimar FL USA
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