Rick I once had a 65 Elan S2 and still have the factory issued shop and
parts manuals. If you think those tolerances are listed in there I will
check for you. They are in my library of shop manuals that go back eons. I
sold the cars buit always kept the shop manuals for ever car I ever owned.
Let me know if the list can't provide the help you seek. I am surprised
Barney hasn't responded. Even tho it's not an A he seems to be knowledgable
about many more cars that As.
Frank Krajewski
----- Original Message -----
From: "Rick Lindsay" <rolindsay@yahoo.com>
To: <mgs@autox.team.net>
Sent: Friday, December 07, 2012 7:29 PM
Subject: [Mgs] Ring groove width tolerance
> Hello Friends,
>
> When it comes to technical issues beyond my knowledge, I turn to you guys,
> independent of the engine manufacturer. The engine I'm building is a
> Lotus-Ford Twin Cam from a '65 Elan S2. Here's the story and the
> question;
>
> Bore = 3.250"
>
> First compression ring = 0.083" ring groove width, ring is designed for
> 0.078" width.
>
> Second compression ring = 0.079" ring groove width, which is within spec.
>
> Oil ring = correct.
>
> Lotus specifies that the groove width limit is 0.080" but that's for a new
> engine. My question is whether 0.005" is a little too large for an engine
> destined for mild street motoring (with a few moments of spirited driving
> tossed in). Or am I going to have to source custom rings? :-o
>
> Thanks in advance for any and all advice. Respond off-list if desired.
>
> -rick
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