<html><body>The way I understand it, is today its all about friction. Many of the modern day pistons are three ring only. In the old days we needed all the squeeze we could get to keep oil out of the combustion. With todays machining capabilities, tolerances are so close that its not as much an issue as in the past. If you want less drag on your engine you can leave out the oil control set, but you may get some blow by on these old iron clunkers. <div><br></div><div>I tend to follow the proper parts assembly, so that if there are five slots I fill them with 5 rings. My NOS replacement .020 Mahle pistons had 4 and a matched set of Grant rings fit perfect. No blowby and good compression. Hank<br><br><div class="reply-new-signature"></div><p>-----------------------------------------</p>From: "Michael Salter via Healeys" <healeys@autox.team.net><br>To: "S and T Miller"<br>Cc: "healeys@autox.team.net"<br>Sent: Friday April 29 2022 7:07:22AM<br>Subject: Re: [Healeys] 100 piston rings- Moss<br><br>
<div>I have gone through all my TSBs but couldn't find
the 1 that I was looking for.
<div>As I recall there was one, I seem to remember that
I was applicable to the 100/6 engine, that said to delete the
bottom ring during rebuilds. </div>
<div><br></div>
<div>M</div>
</div>
<br><div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri., Apr. 29, 2022, 9:22 a.m.
S and T Miller via Healeys, <<a>healeys@autox.team.net</a>>
wrote:<br></div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>
<div style="font-family:inherit;font-size:inherit;color:inherit;">
Hoping to validate my decision before buttoning things up on my 100
engine. Ordered .020 over standard (not 100M) piston set from Moss.
Piston is a 4 ring piston, but came with 5 rings. They were
identified where each ring should be fitted #1-5, with #4 (3 piece
oil control ring), and #5 (one piece oil control ring). Obviously
not a groove for #5. Ring set was marked 100/100M, so I'm assuming
they send the same set for both and you just leave off the #5 (one
piece oil control ring) on the 100 pistons. This is what I decided
to do. Now Moss's 4 ring set on the website shows the three upper
rings and the #4 ring being the 3 piece oil control ring
reinforcing the thought that the #5 (one piece ring) should be
disregarded. </div>
<div style="font-family:inherit;font-size:inherit;color:inherit;">
<br></div>
<div style="font-family:inherit;font-size:inherit;color:inherit;">
Called Moss Tech support and after a week they got back to me and
said that he didn't know the answer, and they would get back to me.
That was another week ago and still no answer. Also nothing
is indicated in the piston directions. Thought I would check
to see if anyone on the list ran across this?</div>
<div style="font-family:inherit;font-size:inherit;color:inherit;">
TY, Shawn</div>
<div><br></div>
<div>The Millers<br>
<br>
"Always drive them, but remember each drive in an antique car is a
test drive."<br></div>
</div>
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