Re: [Harp-L] Double Reed Plate Harmonicas

[Vern <jevern@xxxxxxx>]

Joe,

I’m with Halchak on this one.

Let P =  volume swept by the moving Piston. 
      H =  Head volume at the top of the stroke.
      R = compression Ratio.

 (H + P) is the  total volume at the bottom of the stroke
R = vol at bottom of stroke / vol at top of stroke,  or  R = (H + P) / H
If P is bored larger, then R is also larger….assuming that you don’t mess with the head volume H.

Vern

 
> On Apr 9, 2016, at 6:12 PM, Joseph Leone <3n037@xxxxxxxxxxx> wrote:
> 
> 
> 
> Begin forwarded message:
> 
>> From: Joseph Leone <3n037@xxxxxxxxxxx>
>> Date: April 9, 2016 9:11:31 PM EDT
>> To: Vern <jevern@xxxxxxx>
>> Subject: Re: [Harp-L] Double Reed Plate Harmonicas
>> 
>> 
>> 
>>> 
>>>> ….If you bore out the cylinders on an engine to make them larger, it increases the displacement and raises compression.
>> 
>> If you bore out a cylinder and make the volume of the cylinder larger, you reduce the compression. 
>> 
>> smo-joe
>