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The factory parts list AKD 870 for the 100 shows both compression and scrap=
er rings. Four rings, all above the wrist pin.=C2=A0P
-----Original Message-----
From: Michael MacLean via Healeys <healeys@autox.team.net>
To: William Atterbury <watterbury@yahoo.com>; Healeys <healeys@autox.team.n=
et>
Sent: Sun, Apr 18, 2021 6:54 pm
Subject: Re: [Healeys] Healeys Digest, Vol 14, Issue 142
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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r.mike@att.net
=20
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Healeys@autox.team.net
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------=_Part_3661406_827189416.1618789966987
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<div style=3D"color:black;font: 10pt Arial, Helvetica, sans-serif;">The fac=
tory parts list AKD 870 for the 100 shows both compression and scraper ring=
s. Four rings, all above the wrist pin.
<div>P<br>
<br>
<br>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black"><font=
size=3D"2">-----Original Message-----<br>
From: Michael MacLean via Healeys <healeys@autox.team.net><br>
To: William Atterbury <watterbury@yahoo.com>; Healeys <healeys@aut=
ox.team.net><br>
Sent: Sun, Apr 18, 2021 6:54 pm<br>
Subject: Re: [Healeys] Healeys Digest, Vol 14, Issue 142<br>
<br>
<div id=3D"yiv8688423657">
<div>I don't know about the six cylinder engines, but during the rebuild of=
my BN2 engine I used 3 ring pistons from Moss. Not exactly the most =
exclusive examples of piston technology, but the very experienced engine bu=
ilder that built my shot block for me said they will do just fine. He=
ck I don't even remember seeing an oil scraper ring on them. Not an e=
xpert, but could the way the bottom ring was ground to shape have an oil sc=
raping purpose?
<div id=3D"yiv8688423657yMail_cursorElementTracker_1618786399393">Mike MacL=
ean </div>
<div id=3D"yiv8688423657yMail_cursorElementTracker_1618786421646">Out of my=
five vehicles, only one has a catalytic converter. Take that Greta T=
hunberg.<br clear=3D"none"><br clear=3D"none">
<div id=3D"yiv8688423657ymail_android_signature"><a rel=3D"nofollow noopene=
r noreferrer" shape=3D"rect" id=3D"yiv8688423657ymail_android_signature_lin=
k" target=3D"_blank" href=3D"https://go.onelink.me/107872968?pid=3DInProduc=
t&c=3DGlobal_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=
=3Dym&af_sub1=3DInternal&af_sub2=3DGlobal_YGrowth&af_sub3=3DEma=
ilSignature">Sent from AT&T Yahoo Mail on Android</a></div>
<br clear=3D"none"> <blockquote style=3D"margin:0 0 20px 0;">=20
<div class=3D"yiv8688423657yqt9041207387" id=3D"yiv8688423657yqt64350">
<div style=3D"font-family:Roboto, sans-serif;color:#6D00F6;">=20
<div>On Sat, Apr 17, 2021 at 4:37 PM, William Atterbury via Healeys</div>
<div><healeys@autox.team.net> wrote:</div>
</div>
=20
<div style=3D"padding:10px 0 0 20px;margin:10px 0 0 0;border-left:1px solid=
#6D00F6;">=20
<div id=3D"yiv8688423657">
<div>
<div class=3D"yiv8688423657ydpf5e37345yahoo-style-wrap" style=3D"font-famil=
y:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;">
<div></div>
=20
<div dir=3D"ltr">
<div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">Hey Ian,</div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">The rumor I heard was that the 5th ring was for hone-and-replace =
rebuilds to reduce oil consumption. I'll let others comment if these =
cars were fitted with 4 or 5 rings from the factory (I'm guessing 4). =
I rebuilt mine with 4, like the others. Not a problem for our coddle=
d Healeys. Heck, I even know of one fellow who only put in three for =
a hot motor.</div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;"><br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">Bill Atterbury</div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">BT7</div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;"><br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">-----------------------------------------------------------------=
-----<br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;"><br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">Message: 1<br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">Date: Fri, 16 Apr 2021 19:08:56 +0100<br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">From: "Ian Hey" <<a rel=3D"nofollow noopener noreferrer" shape=
=3D"rect" ymailto=3D"mailto:rianhey@btinternet.com"; target=3D"_blank" href=
=3D"mailto:rianhey@btinternet.com"; style=3D"color:rgb(25, 106, 212);text-de=
coration-line:underline;">rianhey@btinternet.com</a>><br clear=3D"none">=
</div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">To: <<a rel=3D"nofollow noopener noreferrer" shape=3D"rect" ym=
ailto=3D"mailto:healeys@autox.team.net"; target=3D"_blank" href=3D"mailto:he=
aleys@autox.team.net" style=3D"color:rgb(25, 106, 212);text-decoration-line=
:underline;">healeys@autox.team.net</a>><br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">Subject: [Healeys] To fit or not to fit<br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">Message-ID: <002201d732eb$915662a0$b40327e0$@btinternet.com>=
;<br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">Content-Type: text/plain; charset=3D"us-ascii"<br clear=3D"none">=
</div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;"><br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">In a recent engine rebuild of a standard BJ7 engine which was fit=
ted with<br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">four ring pistons, when I looked at replacement pistons they were=
pictured<br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">with five rings, which did not seem good to me.<br clear=3D"none"=
></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;"><br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">I fitted Omega pistons from Denis Welch. These have three r=
ings with a<br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">total width of 3.2mm compared with 9.8mm for the four rings. =
; (For the oil<br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">rings only the width contacting the cylinder bore is measured</di=
v>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;"><br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">Since friction is in proportion to ring width (possibly due to th=
e lower<br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">pressure required to make thinner rings seat against the cylinder=
wall) this<br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">represents a reduction in losses to heat and a power increase (sm=
all).<br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;"><br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">Another, much more expensive, option for consideration. I a=
lso have no<br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">doubts about the quality of the pistons, whereas I am not sure ab=
out the<br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">four or five ringed replacements. They seem very cheap to m=
e.<br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;"><br clear=3D"none"></div>
<div dir=3D"ltr" style=3D"font-family:Helvetica Neue, Helvetica, Arial, san=
s-serif;">Ian</div>
</div>
<br clear=3D"none"></div>
</div>
</div>
</div>
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