[Healeys] 100 piston rings- Moss

[Michael MacLean]

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 <
healeys at autox.team.net> 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 <healeys at autox.team.net>
> *Sent: *Friday, April 29, 2022 9:03 AM
> *To: *S and T Miller <stmiller96 at hotmail.com>
> *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 <
> healeys at autox.team.net> 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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