<VV> Corvair 110 sounds like 10 lb hammer
hallgrenn at aol.com
Sun Jul 19 23:39:46 EDT 2015
In my experience a dropped valve seat is more a clacking to a sharp light thudding sound related to the accompanied miss. But it also can reseat (poorly) and quiet down for a short time before getting worse. Hope whatever it is will be cheap to fix for you.
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-------- Original message --------
From: chaz--- via VirtualVairs <virtualvairs at corvair.org>
Date: 07/19/2015 10:56 PM (GMT-05:00)
To: virtualvairs at corvair.org
Subject: <VV> Corvair 110 sounds like 10 lb hammer
Hey Guys ~
Hi again ~ I've been busy with a new place ~ with a GARAGE finally!!!
Unfortunately, my formerly sweet-running Vair obliged me with a malady
and is now laid to temporary rest in her new garage:
After over 5000 miles of smooth-running bliss, the loudest noise being
the fan and the air rushing over the windshield, all of a sudden it
sounded like 10 lb hammer on an anvil.
The banging is in synch with the RPM, driving and then at idle, 1:1,
maybe 2:1 with RPM, but definitely in synch with the RPM.
Being in a bad area at night, and AAA taking almost a half hour to
answer my call, I drove about a mile home (AAA answered after I was
The drive was smooth except the rapping noise, and even in 4th gear at
25 MPH, and had good power although I did not push it too hard.
Twice, the noise went away for a few seconds with no noticeable change
in power, just back to her former purring.
I thought maybe a dropped valve seat that re-seated for a moment, but
the compression is (right side) 130/90/130 and (left side) 110/100/110
There is no noticeable noise or resistance when I turn her over with the
fan belt or with a wrench.
There is also no noticeable noise or resistance when I crank her over
with the starter (with the coil wire off) ~ she sounds "normal" ~ just
smoothly cranking over.
Tomorrow I may pull the right head where the source of the banging noise
seems to originate, but I figured a little theory might help me see what
I might find when I open her up?
So, what do you think?
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