[SEL] Compression question

[James OHAGAN]

Russell, By removing the upper ring, you will lower the compression ratio, a
step in the wrong direction. Jimmy

-----Original Message-----
From: sel-bounces at lists.stationary-engine.com
[mailto:sel-bounces at lists.stationary-engine.com] On Behalf Of Mark Shulaw
Sent: Monday, May 07, 2012 6:59 PM
To: The SEL email discussion list
Subject: Re: [SEL] Compression question

Hi Russell,
IF you were to cut a fourth groove I would rather empty one of the 
middle grooves or just fill them all with a ring. Three rings towards 
the center of the piston might tend to promote a teeter totter effect 
on the piston. Causing a similar effect to "skirt wear or scuff" at 
the top of the piston.
And also be warned look closely builders tended to reduce thickness 
of piston walls once they got past where they intended rings to be to 
reduce weight. So there may not be enough depth for a fourth ring 
further back.
  You could also just put in two rings per groove,  This helps in a 
cylinder with small pits.  For example If they are 1/4 " grooves put 
in two 1/8" rings per.

Mark


At 05:47 PM 5/7/2012, you wrote:
>How ever if it is a problem; I was thinking instead of boring or 
>sleeving. Could I just cut another ring groove further back along 
>the piston; remove the top ring and put in the lower new groove?? 
>This would avoid the pitted area mostly and the majority of rings 
>would be running in a clean bore? Any issues with something like this?


Mark Shulaw
454 County Road 33
Bluffton, OH. 45817
USA

Frappi at wcoil.com / 419.358.5206  Home
Hobby Collector and Dealer in John Deere
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