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Re: [Healeys] Healeys Digest, Vol 14, Issue 142

To: William Atterbury <watterbury@yahoo.com>, Healeys <healeys@autox.team.net>
Subject: Re: [Healeys] Healeys Digest, Vol 14, Issue 142
From: Michael MacLean via Healeys <healeys@autox.team.net>
Date: Sun, 18 Apr 2021 22:54:56 +0000 (UTC)
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <mailman.5.1618682403.26764.healeys@autox.team.net> <1590869023.3456730.1618702579901@mail.yahoo.com> (com.yahoo.mobile.client.android.mail/6.19.4; Android/11; RP1A.200720.012; d2q; samsung; SM-N975U; 6.24; 2069x1080; )
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I don't know about the six cylinder engines, but during the rebuild of my B=
N2 engine I used 3 ring pistons from Moss.=C2=A0 Not exactly the most exclu=
sive examples of piston technology, but the very experienced engine builder=
 that built my shot block for me said they will do just fine.=C2=A0 Heck I =
don't even remember seeing an oil scraper ring on them.=C2=A0 Not an expert=
, but could the way the bottom ring was ground to shape have an oil scrapin=
g purpose?Mike MacLean=C2=A0Out of my five vehicles, only one has a catalyt=
ic converter.=C2=A0 Take that Greta Thunberg.

Sent from AT&T Yahoo Mail on Android=20
=20
  On Sat, Apr 17, 2021 at 4:37 PM, William Atterbury via Healeys<healeys@au=
tox.team.net> wrote:    Hey Ian,The rumor I heard was that the 5th ring was=
 for hone-and-replace rebuilds to reduce oil consumption.=C2=A0 I'll let ot=
hers comment if these cars were fitted with 4 or 5 rings from the factory (=
I'm guessing 4).=C2=A0 I rebuilt mine with 4, like the others.=C2=A0 Not a =
problem for our coddled Healeys.=C2=A0 Heck, I even know of one fellow who =
only put in three for a hot motor.
Bill AtterburyBT7
----------------------------------------------------------------------

Message: 1
Date: Fri, 16 Apr 2021 19:08:56 +0100
From: "Ian Hey" <rianhey@btinternet.com>
To: <healeys@autox.team.net>
Subject: [Healeys] To fit or not to fit

In a recent engine rebuild of a standard BJ7 engine which was fitted with
four ring pistons, when I looked at replacement pistons they were pictured
with five rings, which did not seem good to me.

I fitted Omega pistons from Denis Welch.=C2=A0 These have three rings with =
a
total width of 3.2mm compared with 9.8mm for the four rings.=C2=A0 (For the=
 oil
rings only the width contacting the cylinder bore is measured
Since friction is in proportion to ring width (possibly due to the lower
pressure required to make thinner rings seat against the cylinder wall) thi=
s
represents a reduction in losses to heat and a power increase (small).

Another, much more expensive, option for consideration.=C2=A0 I also have n=
o
doubts about the quality of the pistons, whereas I am not sure about the
four or five ringed replacements.=C2=A0 They seem very cheap to me.

Ian
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e

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r.mike@att.net

 =20

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I don't know about the six cylinder engines, but during the rebuild of my B=
N2 engine I used 3 ring pistons from Moss.&nbsp; Not exactly the most exclu=
sive examples of piston technology, but the very experienced engine builder=
 that built my shot block for me said they will do just fine.&nbsp; Heck I =
don't even remember seeing an oil scraper ring on them.&nbsp; Not an expert=
, but could the way the bottom ring was ground to shape have an oil scrapin=
g purpose?<div id=3D"yMail_cursorElementTracker_1618786399393">Mike MacLean=
&nbsp;</div><div id=3D"yMail_cursorElementTracker_1618786421646">Out of my =
five vehicles, only one has a catalytic converter.&nbsp; Take that Greta Th=
unberg.<br><br><div id=3D"ymail_android_signature"><a id=3D"ymail_android_s=
ignature_link" href=3D"https://go.onelink.me/107872968?pid=3DInProduct&amp;=
c=3DGlobal_Internal_YGrowth_AndroidEmailSig__AndroidUsers&amp;af_wl=3Dym&am=
p;af_sub1=3DInternal&amp;af_sub2=3DGlobal_YGrowth&amp;af_sub3=3DEmailSignat=
ure">Sent from AT&amp;T Yahoo Mail on Android</a></div> <br> <blockquote st=
yle=3D"margin: 0 0 20px 0;"> <div style=3D"font-family:Roboto, sans-serif; =
color:#6D00F6;"> <div>On Sat, Apr 17, 2021 at 4:37 PM, William Atterbury vi=
a Healeys</div><div>&lt;healeys@autox.team.net&gt; wrote:</div> </div> <div=
 style=3D"padding: 10px 0 0 20px; margin: 10px 0 0 0; border-left: 1px soli=
d #6D00F6;"> <div id=3D"yiv5269241550"><div><div class=3D"yiv5269241550ydpf=
5e37345yahoo-style-wrap" style=3D"font-family:Helvetica Neue, Helvetica, Ar=
ial, sans-serif;font-size:16px;"><div></div>
        <div dir=3D"ltr"><div><div dir=3D"ltr" style=3D"font-family:Helveti=
ca Neue, Helvetica, Arial, sans-serif;">Hey Ian,</div><div dir=3D"ltr" styl=
e=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;">The rumor I=
 heard was that the 5th ring was for hone-and-replace rebuilds to reduce oi=
l consumption.&nbsp; I'll let others comment if these cars were fitted with=
 4 or 5 rings from the factory (I'm guessing 4).&nbsp; I rebuilt mine with =
4, like the others.&nbsp; Not a problem for our coddled Healeys.&nbsp; Heck=
, I even know of one fellow who only put in three for a hot motor.</div><di=
v dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-s=
erif;"><br></div><div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helv=
etica, Arial, sans-serif;">Bill Atterbury</div><div dir=3D"ltr" style=3D"fo=
nt-family:Helvetica Neue, Helvetica, Arial, sans-serif;">BT7</div><div dir=
=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;=
"><br></div><div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica=
, Arial, sans-serif;">-----------------------------------------------------=
-----------------<br></div><div dir=3D"ltr" style=3D"font-family:Helvetica =
Neue, Helvetica, Arial, sans-serif;"><br></div><div dir=3D"ltr" style=3D"fo=
nt-family:Helvetica Neue, Helvetica, Arial, sans-serif;">Message: 1<br></di=
v><div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, s=
ans-serif;">Date: Fri, 16 Apr 2021 19:08:56 +0100<br></div><div dir=3D"ltr"=
 style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;">From: =
"Ian Hey" &lt;<a rel=3D"nofollow noopener noreferrer" ymailto=3D"mailto:ria=
nhey@btinternet.com" target=3D"_blank" href=3D"mailto:rianhey@btinternet.co=
m" style=3D"color:rgb(25, 106, 212);text-decoration-line:underline;">rianhe=
y@btinternet.com</a>&gt;<br></div><div dir=3D"ltr" style=3D"font-family:Hel=
vetica Neue, Helvetica, Arial, sans-serif;">To: &lt;<a rel=3D"nofollow noop=
ener noreferrer" ymailto=3D"mailto:healeys@autox.team.net"; target=3D"_blank=
" href=3D"mailto:healeys@autox.team.net"; style=3D"color:rgb(25, 106, 212);t=
ext-decoration-line:underline;">healeys@autox.team.net</a>&gt;<br></div><di=
v dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-s=
erif;">Subject: [Healeys] To fit or not to fit<br></div><div dir=3D"ltr" st=
yle=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;">Message-I=
D: &lt;002201d732eb$915662a0$b40327e0$@btinternet.com&gt;<br></div><div dir=
=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;=
">Content-Type: text/plain; charset=3D"us-ascii"<br></div><div dir=3D"ltr" =
style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;"><br></d=
iv><div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, =
sans-serif;">In a recent engine rebuild of a standard BJ7 engine which was =
fitted with<br></div><div dir=3D"ltr" style=3D"font-family:Helvetica Neue, =
Helvetica, Arial, sans-serif;">four ring pistons, when I looked at replacem=
ent pistons they were pictured<br></div><div dir=3D"ltr" style=3D"font-fami=
ly:Helvetica Neue, Helvetica, Arial, sans-serif;">with five rings, which di=
d not seem good to me.<br></div><div dir=3D"ltr" style=3D"font-family:Helve=
tica Neue, Helvetica, Arial, sans-serif;"><br></div><div dir=3D"ltr" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;">I fitted Ome=
ga pistons from Denis Welch.&nbsp; These have three rings with a<br></div><=
div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans=
-serif;">total width of 3.2mm compared with 9.8mm for the four rings.&nbsp;=
 (For the oil<br></div><div dir=3D"ltr" style=3D"font-family:Helvetica Neue=
, Helvetica, Arial, sans-serif;">rings only the width contacting the cylind=
er bore is measured</div><div dir=3D"ltr" style=3D"font-family:Helvetica Ne=
ue, Helvetica, Arial, sans-serif;"><br></div><div dir=3D"ltr" style=3D"font=
-family:Helvetica Neue, Helvetica, Arial, sans-serif;">Since friction is in=
 proportion to ring width (possibly due to the lower<br></div><div dir=3D"l=
tr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;">pre=
ssure required to make thinner rings seat against the cylinder wall) this<b=
r></div><div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Ar=
ial, sans-serif;">represents a reduction in losses to heat and a power incr=
ease (small).<br></div><div dir=3D"ltr" style=3D"font-family:Helvetica Neue=
, Helvetica, Arial, sans-serif;"><br></div><div dir=3D"ltr" style=3D"font-f=
amily:Helvetica Neue, Helvetica, Arial, sans-serif;">Another, much more exp=
ensive, option for consideration.&nbsp; I also have no<br></div><div dir=3D=
"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;">d=
oubts about the quality of the pistons, whereas I am not sure about the<br>=
</div><div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Aria=
l, sans-serif;">four or five ringed replacements.&nbsp; They seem very chea=
p to me.<br></div><div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Hel=
vetica, Arial, sans-serif;"><br></div><div dir=3D"ltr" style=3D"font-family=
:Helvetica Neue, Helvetica, Arial, sans-serif;">Ian</div></div><br></div></=
div></div></div>_______________________________________________<br>Support =
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r> </div> </blockquote></div>
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