[Healeys] 100 piston rings- Moss

Fri Apr 29 11:51:01 MDT 2022

Upon disassembly of the engine for my 100, I also found .060 flat top
pistons installed (just as Steven described). This car had been raced
extensively, and as I understand it a common practice in the 50s was
to use the pistons from a Dodge or Plymouth for more compression
(10-1?). Of course I had to re-sleeve the engine to get back to .020
dished pistons (7-1 compression).
I was able to quickly sell the .060s on ebay to a racer for his
Healey. Hank

	-----------------------------------------From: "Michael MacLean via
Healeys" 
To: "Harold Manifold", "Ahealey help"
Cc: 
Sent: Friday April 29 2022 10:20:06AM
Subject: Re: [Healeys] 100 piston rings- Moss

  I don't know what to tell you guys, but I bought the piston set from
Moss several years ago for the short block of my BN2. The pistons came
with three plain rings and grooves only. Obviously they don't sell
this set anymore. My engine builder said it would be OK when I asked
about the lack of an oil control ring. He just said I would have less
friction this way. Kind of wondering now that I see all your examples.
Mike MacLean

 On Fri, Apr 29, 2022 at 9:58 AM Harold Manifold via Healeys  wrote:

	New pistons should come with a very detailed instructions. See
attached example from Wossner. The engine builder and machine shop
needs this information to properly fit pistons and rings especially if
the pistons are different that OEM. 

	Harold 

	 FROM: Steven Kingsbury via Healeys
SENT: Friday, April 29, 2022 9:03 AM
TO: S and T Miller
CC: healeys at autox.team.net
SUBJECT: Re: [Healeys] 100 piston rings- Moss  

	I rebuilt my engine in October, 2020 and I got my pistons from Austin
Healey Spares in the UK. They were 0.060 over M spec pistons and as
you can see from the photo, they did indeed need the fifth ring. Hope
this helps with your situation and thoughts.   

	The pistons I replaced weren't even AH pistons. My machine shop
couldn't figure out where they originated, but the replacement rings
we found for them that would fit were for a 1950's Plymouth or
Mercury. They were also flat topped and were going to create too much
compression, so that's why I went with the M spec pistons.   

	Steven Kingsbury   

	BN1   

	On Apr 29, 2022, at 6:23 AM, 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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