[SEL] Piston Rings and old engines.

[curt at rustyiron.com]

Tommy,George,
I just replied to George on his question about predicting the ID of the
blank ring to have the ID come out to the correct ID to work in the ring
groove. Now I'm not so sure that you can increase the blank ring ID by the
removed segment length/PI. Despite using wire to compress, I'm not
convinced the entire hoop of the ring deflects evenly. Still have a couple
of rings to turn for the smaller piston, so I'm going to make a point take
a few measurements and report back. It could turn out to be simply that
the smallest dimension on the ID oval is simple 1/2 the gap amount. In
otherwords, if the gap is to be 1/2", the smallest oval dimension will be
1/4" less. But I'll measure and report back.
Curt


> Tommy,
>
> Think you have that backwards.  Measuring the "land" tells you the
> minimum internal ring diameter of the compressed ring, plus of course
> some clearance as you don't want the ring to bottom out against the
> land.
>
> The measurement I was wondering about is the internal diameter of the
> uncompressed ring.
>
> George
>
> -----Original Message-----
> From: sel-bounces at lists.stationary-engine.com
> [mailto:sel-bounces at lists.stationary-engine.com] On Behalf Of Tommy
> Turner
> Sent: Thursday, October 02, 2008 1:19 PM
> To: 'The SEL email discussion list'
> Subject: Re: [SEL] Piston Rings and old engines.
>
> George, wouldn't you simply measure the land (bottom) of the ring groove
> and that would give you the maximum internal diameter?  You would then
> probably deduct 10 to 15 thousandths to prevent binding of the ring when
> it gets hot.  Not sure this would be right but I don't know why it
> wouldn't work.
>
> Tommy Turner
> Magnolia, KY
>
>
>
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