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Thanks Charlie, I have a BT7, and already have bought a rear main oil =
seal conversion kit, but thanks for the offer.
=20
Mirek
=20
From: Charles Schott <schottc@knology.net>=20
Sent: April 19, 2021 9:07 AM
To: m g sharp <m.g.sharp@sympatico.ca>
Cc: healeys@autox.team.net
Subject: Re: [Healeys] Ring Choice - closing the loop
=20
Mirek,
=20
You might be too far along for this, but if you're doing a 100-4 engine =
I have a new single lip seal conversion kit for the rear of the engine. =
It requires machining of the crankshaft and the engine block. Also, you =
can buy a timing chain cover that has been modified to take a single lip =
seal.
=20
Regards,
=20
Charlie=20
=20
_____ =20
From: "m.g.sharp--- via Healeys" <healeys@autox.team.net =
Sent: Monday, April 19, 2021 7:14:19 AM
Subject: [Healeys] Ring Choice - closing the loop
=20
Many thanks to everyone who responded to my question about the rings. =
Seems that there are examples of people fitting that fifth ring and =
leaving it off, and no-one reported a problem or bad experience either =
way. It also seems there is no hard knowledge on why that bottom ring =
was fitted, but several of us, me included, think it may have been =
aesthetic: simply to reduce the noise from piston slap. I thought =
Earl=E2=80=99s response was most telling in that he had been through a =
complete engine cycle (i.e. he is on his second rebuild after 140,000 =
miles on the first) with a 5-ring piston and there were no issues noted =
on the strip-down and good performance.
=20
While I have no doubt that extra ring may result in extra friction and =
rob the engine of a horsepower or two, no-one has measured it, so we do =
not know if that is significant in any way. The only other potential =
down-side is that the bottom ring will scrape the oil from the cylinder =
wall on the down-stroke, reducing lubrication on any piston-cylinder =
wall contact between the two oil control rings. However, the bottom =
ring may also prevent the piston from making contact with wall, or at =
least reduce the friction, so maybe that is not an issue.
=20
My goal is a well-built, reliable, original car with factory-level =
performance. Given that, and some concerns about the unknown =
consequences of an empty ring groove, I am electing to install the 5th =
ring. Also, I think there is wisdom in Hank=E2=80=99s comment that as a =
general rule parts should be installed as the manufacturer intended =
=E2=80=93 who are we to second guess the engineers who thought it =
necessary to add that ring?
=20
Interesting discussion, and if anyone ever turns up hard engineering =
evidence as to why that extra ring was added, I would be very happy if =
they would share it.
=20
As always, this list is amazing for providing a forum for providing a =
forum for discussion on the things we find interesting =E2=80=93 as =
arcane they may be!
=20
With thanks, Mirek
_______________________________________________
=20
Archive: http://www.team.net/pipermail/healeys =
http://autox.team.net/archive
=20
http://autox.team.net/mailman/listinfo/healeys
=20
http://autox.team.net/mailman/options/healeys/schottc@knology.net
=20
=20
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vlink=3Dpurple style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal>Thanks Charlie, I have a BT7, =
and already have bought a rear main oil seal conversion kit, but thanks =
for the offer.<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>Mirek<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-CA'>From:</span></b><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-CA'> Charles Schott =
<schottc@knology.net> <br><b>Sent:</b> April 19, 2021 9:07 =
AM<br><b>To:</b> m g sharp <m.g.sharp@sympatico.ca><br><b>Cc:</b> =
healeys@autox.team.net<br><b>Subject:</b> Re: [Healeys] Ring Choice - =
closing the loop<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman",serif;color:black'>Mirek,</span><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman",serif;color:black;mso-fareast-language:EN-CA'><o:p></o:p></span></=
p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman",serif;color:black'><o:p> </o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman",serif;color:black'>You might be too far along for this, but if =
you're doing a 100-4 engine I have a new single lip seal conversion kit =
for the rear of the engine. It requires machining of the crankshaft and =
the engine block. Also, you can buy a timing chain cover that has been =
modified to take a single lip seal.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman",serif;color:black'><o:p> </o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman",serif;color:black'>Regards,<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman",serif;color:black'><o:p> </o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman",serif;color:black'>Charlie <o:p></o:p></span></p></div><div><=
p class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times =
New Roman",serif;color:black'><o:p> </o:p></span></p></div><div =
class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman",serif;color:black'><hr size=3D2 width=3D"100%" align=3Dcenter =
id=3Dzwchr></span></div><div><p class=3DMsoNormal><b><span =
style=3D'font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black'=
>From: </span></b><span =
style=3D'font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black'=
>"m.g.sharp--- via Healeys" <<a =
href=3D"mailto:healeys@autox.team.net";>healeys@autox.team.net</a>><br>=
<b>To: </b><a =
href=3D"mailto:healeys@autox.team.net";>healeys@autox.team.net</a><br><b>S=
ent: </b>Monday, April 19, 2021 7:14:19 AM<br><b>Subject: </b>[Healeys] =
Ring Choice - closing the loop<o:p></o:p></span></p><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black'=
><o:p> </o:p></span></p></div><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:black'>Many thanks to everyone who responded =
to my question about the rings. Seems that there are examples of =
people fitting that fifth ring and leaving it off, and no-one reported a =
problem or bad experience either way. It also seems there is no =
hard knowledge on why that bottom ring was fitted, but several of us, me =
included, think it may have been aesthetic: simply to reduce the noise =
from piston slap. I thought Earl=E2=80=99s response was most =
telling in that he had been through a complete engine cycle (i.e. he is =
on his second rebuild after 140,000 miles on the first) with a 5-ring =
piston and there were no issues noted on the strip-down and good =
performance.</span><span style=3D'color:black'><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:black'> </span><span =
style=3D'color:black'><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:black'>While I have no doubt that extra ring =
may result in extra friction and rob the engine of a horsepower or two, =
no-one has measured it, so we do not know if that is significant in any =
way. The only other potential down-side is that the bottom ring =
will scrape the oil from the cylinder wall on the down-stroke, reducing =
lubrication on any piston-cylinder wall contact between the two oil =
control rings. However, the bottom ring may also prevent the =
piston from making contact with wall, or at least <u>reduce</u> the =
friction, so maybe that is not an issue.</span><span =
style=3D'color:black'><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:black'> </span><span =
style=3D'color:black'><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:black'>My goal is a well-built, reliable, =
original car with factory-level performance. Given that, and some =
concerns about the unknown consequences of an empty ring groove, I am =
electing to install the 5<sup>th</sup> ring. Also, I think there =
is wisdom in Hank=E2=80=99s comment that as a general rule parts should =
be installed as the manufacturer intended =E2=80=93 who are we to second =
guess the engineers who thought it necessary to add that =
ring?</span><span style=3D'color:black'><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:black'> </span><span =
style=3D'color:black'><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:black'>Interesting discussion, and if anyone =
ever turns up hard engineering evidence as to why that extra ring was =
added, I would be very happy if they would share it.</span><span =
style=3D'color:black'><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:black'> </span><span =
style=3D'color:black'><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:black'>As always, this list is amazing for =
providing a forum for providing a forum for discussion on the things we =
find interesting =E2=80=93 as arcane they may be!</span><span =
style=3D'color:black'><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:black'> </span><span =
style=3D'color:black'><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:black'>With thanks, Mirek</span><span =
style=3D'color:black'><o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black;=
mso-fareast-language:EN-CA'><br>_________________________________________=
______<br>Support Team.Net <a =
href=3D"http://www.team.net/donate.html";>http://www.team.net/donate.html<=
/a><br>Suggested annual donation =
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