Sounds like a classic situation of engine or other item (like an exhaust
pipe) resting against an engine mount or the cowling. I realize that in
a coordinated turn the weight of the engine still pulls downward, but it
effectively weighs more due to the G force. That could shift it just
enough to contact something.

I'd check both the mounts for deterioration for the correct hardware
holding the engine in the mounts. Try removing the top cowling - then
have someone pull down on the prop (near the hub of course) while you
look at exhaust pipe clearance. Or, while you pull down on the prop,
note whether it feels like it is moving and "bottoming out."

David
N6359V


Glen Ward wrote:
> 
> HI all,
> Anybody ever notice that their engine vibrates way more in turns?   Mine
> runs pretty smooth at cruise RPM 2250 but it shakes a good bit in turns.  I
> can feel a
> pounding in the rudder pedals when turning.  That plane's vibrations really
> bug me.  It always shakes 1500-2100 rpm too whether turning or not but I
> just avoid that range.  There is an odd "put-pupu-put-pop" around 1600, I am
> not sure if it is normal or not for these old engines. Glen Ward
> 
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