[Healeys] 100 piston rings- Moss

[gradea1 at charter.net]

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. 
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

	-----------------------------------------From: "Michael Salter via
Healeys" 
To: "S and T Miller"
Cc: "healeys at autox.team.net"
Sent: Friday April 29 2022 7:07:22AM
Subject: Re: [Healeys] 100 piston rings- Moss

 I have gone through all my TSBs but couldn't find the 1 that I was
looking for. 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.  
 M  
 On Fri., Apr. 29, 2022, 9:22 a.m. S and T Miller via Healeys,  wrote:
    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.   
  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?  TY, Shawn 
 The Millers

 "Always drive them, but remember each drive in an antique car is a
test drive."
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