<VV> Odd sound - update

[shortle]

If it was a valve seat issue you would know by your compression test results. Does the odd sound stay consistent? Could something have fallen into the cylinders?
Timothy Shortle in Durango Colorado 81301


-----Original Message-----
>From: Bob Gilbert 1 <bgilbert at gilberts-bc.ca>
>Sent: Apr 16, 2014 4:10 PM
>To: virtualvairs at corvair.org
>Subject: <VV> Odd sound - update
>
>Hi,
>
>A few day ago I requested some help with a sound like a lifter noise but
>with a sharper, "metallic" rap in my recently built (<500 miles) 3.1
>
>Several people suggested a problem internal to the engine so I removed "the
>top" of the engine, carbs on down to and including the turkey roaster.
>
>Nothing is loose and there are no visible marks and no signs of part A
>hitting part B and no sign of any foreign material.
>
>I can turn the engine over easily by hand and there is no indication of
>anything touching or obstructing anything.
>
>And of course, with no plugs I can also spin it over quite fast with the
>starter and still no unusual sound or vibration!
>
>If it was a valve seat issue you'd think I be able to hear it.
>
>I am stumped and the only thing I can think of is a lifter problem that
>doesn't show up under these circumstances.
>
>Is that possible?
>
> 
>
>Any other ideas or suggestions most welcome!
>
> 
>
>Meanwhile I have ordered a borescope to take a look inside the cylinders but
>it will take a week to arrive.
>
> 
>
>Thanks in advance,
>
>Bob Gilbert
>
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