<VV> Odd sound - update

[Bob Gilbert 1]

Hi,
I've got 185 plus or minus a couple in each cylinder and the sound stays consistent. I'm hoping the arrival of the borescope next week will identify any internal cylinder damage, for whatever reason.
I did view one Corvair video where the sound - which was very like mine - was attributed to a broken (or leaking?) manifold. I can't imagine an exhaust sound like that so I was wondering if anybody else has heard anything like that?
Thanks,
Bob


-----Original Message-----
From: shortle [mailto:shortle556 at earthlink.net] 
Sent: April 16, 2014 2:12 PM
To: Bob Gilbert 1; virtualvairs at corvair.org
Subject: Re: <VV> Odd sound - update

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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