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Rafael -
All good advice from Michael, these are not original ... and look like the
piston's been modified to save weight.
That said, how many miles are on your engine? Was it performing well? If
it's had this set up for over 70K-100K miles and there's no wear on the
cylinder walls, I'd say just redo it the way it was set up.
That said, the original 5 ring set up will last a very long time with
minimal wear if done and run right.
If you are saving money, no need to get new pistons....
Best,
Alan
On Fri, Jan 9, 2015 at 10:34 AM, Michael Salter <michaelsalter@gmail.com>
wrote:
> Hi Rafael,
> I don't think the piston in your picture is an original Austin piston. I
> have never seen an original piston with the "slipper" shape or one with t=
he
> groves on the body that yours has consequently, the ring package is not
> what would normally be used.
> The top ring is indeed a compression ring but the others are all what we
> used to call "cord" rings and are I believe designed for oil control not
> compression. I'm pretty sure that all original pistons had 2 compression
> rings.
> That said however there is no good reason why they should not work.
> Although the picture is not very clear it would also appear that the
> piston is slightly "domed". I'm pretty sure that the original pistons in =
a
> tri-carb were flat top so I would strongly recommend that you check the
> actual compression ratio to ensure that the engine has not been modified =
so
> much that it will not run well on pump fuel.
> I'm sure that your machine shop knows what they are doing but the
> cylinders should not be "polished" but honed before reassembly.
> Hope that helps.
>
> Michael S
> BN1 #174
> http://www.netbug.net/blogmichael/?p=3D445
>
> On Thu, Jan 8, 2015 at 8:43 PM, Rafael Abugattas <rafaelabugattas@yahoo.e=
s
> > wrote:
>
>> Hi all,
>>
>> I just started a nut and bolt restoration on my 1962 BT7 Tri Carb. Today
>> we took the engine apart and sent the block and head to the machine shop=
.
>> On a first inspection, it seems that the cylinders do not need to be bor=
ed,
>> only polished.
>>
>>
>>
>> My mechanic is concerned about the pistons and the type of rings it uses=
.
>> Enclosed is a picture of one of the pistons and the three set of rings.
>>
>>
>>
>> I am no expert but according to his explanation: Starting from the
>> right, the first thick ring on the picture is the compression ring. The
>> middle or second set includes two additional thin compression rings and
>> what seems like an heptagon that I understand helps keep the rings open.
>> The third set includes three lubrication rings.
>>
>>
>>
>> He mentioned that the middle set of two thin compression rings with the
>> heptagon is not a very common configuration. He was wondering whether th=
ey
>> could be substituted with one regular compression ring.
>>
>>
>>
>> He has worked before on a Healey engine and he doesn=C2=B4t recall pisto=
ns
>> with the grooves on the side like the one on the picture. I guess the
>> groove design helps with the lubrication and cooling of the pistons. Are
>> these original pistons? Would you recommend changing them?
>>
>>
>>
>> Thanks in advance for your comments.
>>
>>
>>
>> Best regards,
>>
>> Rafael
>>
>>
>>
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>>
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>>
>>
>>
>
>
> --
> *If you can't fix it with a hammer, you've got an electrical problem.*
>
>
> _______________________________________________
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<div dir=3D"ltr">Rafael -<div><br></div><div>All good advice from Michael, =
these are not original ... and look like the piston's been modified to =
save weight.</div><div><br></div><div>That said, how many miles are on your=
engine?=C2=A0 Was it performing well?=C2=A0 If it's had this set up fo=
r over 70K-100K miles and there's no wear on the cylinder walls, I'=
d say just redo it the way it was set up.</div><div><br></div><div>That sai=
d, the original 5 ring set up will last a very long time with minimal wear =
if done and run right.</div><div><br></div><div>If you are saving money, no=
need to get new pistons....</div><div><br></div><div>Best,</div><div><br><=
/div><div>Alan</div></div><div class=3D"gmail_extra"><br><div class=3D"gmai=
l_quote">On Fri, Jan 9, 2015 at 10:34 AM, Michael Salter <span dir=3D"ltr">=
<<a href=3D"mailto:michaelsalter@gmail.com"; target=3D"_blank">michaelsal=
ter@gmail.com</a>></span> wrote:<br><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div =
dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sans ms=
,sans-serif;font-size:small">Hi Rafael,<br></div><div class=3D"gmail_defaul=
t" style=3D"font-family:comic sans ms,sans-serif;font-size:small">I don'=
;t think the piston in your picture is an original Austin piston. I have ne=
ver seen an original piston with the "slipper" shape or one with =
the groves on the body that yours has consequently, the ring package is not=
what would normally be used.<br><div class=3D"gmail_default" style=3D"font=
-family:comic sans ms,sans-serif;font-size:small">The top ring is indeed a =
compression ring but the others are all what we used to call "cord&quo=
t; rings and are I believe designed for oil control not compression. I'=
m pretty sure that all original pistons had 2 compression rings.<br></div><=
div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;f=
ont-size:small"></div></div><div class=3D"gmail_default" style=3D"font-fami=
ly:comic sans ms,sans-serif;font-size:small">That said however there is no =
good reason why they should not work. <br></div><div class=3D"gmail_default=
" style=3D"font-family:comic sans ms,sans-serif;font-size:small">Although t=
he picture is not very clear it would also appear that the piston is slight=
ly "domed". I'm pretty sure that the original pistons in a tr=
i-carb were flat top so I would strongly recommend that you check the actua=
l compression ratio to ensure that the engine has not been modified so much=
that it will not run well on pump fuel.<br></div><div class=3D"gmail_defau=
lt" style=3D"font-family:comic sans ms,sans-serif;font-size:small">I'm =
sure that your machine shop knows what they are doing but the cylinders sho=
uld not be "polished" but honed before reassembly.<br></div><div =
class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-=
size:small">Hope that helps.<br><br></div><div class=3D"gmail_default" styl=
e=3D"font-family:comic sans ms,sans-serif;font-size:small">Michael S<br></d=
iv><div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-ser=
if;font-size:small">BN1 #174<br><a href=3D"http://www.netbug.net/blogmichae=
l/?p=3D445" target=3D"_blank">http://www.netbug.net/blogmichael/?p=3D445</a=
><br></div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">=
<div><div class=3D"h5">On Thu, Jan 8, 2015 at 8:43 PM, Rafael Abugattas <sp=
an dir=3D"ltr"><<a href=3D"mailto:rafaelabugattas@yahoo.es"; target=3D"_b=
lank">rafaelabugattas@yahoo.es</a>></span> wrote:<br></div></div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex"><div><div class=3D"h5"><div link=3D"#0563C1" vlink=
=3D"#954F72" lang=3D"ES-PE"><div><p class=3D"MsoNormal"><span lang=3D"EN-US=
">Hi all,<u></u><u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-U=
S">I just started a nut and bolt restoration on my 1962 BT7 Tri Carb. Today=
we took the engine apart and sent the block and head to the machine shop. =
On a first inspection, it seems that the cylinders do not need to be bored,=
only polished.<u></u><u></u></span></p><p class=3D"MsoNormal"><span lang=
=3D"EN-US"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span lang=
=3D"EN-US">My mechanic is concerned about the pistons and the type of rings=
it uses. Enclosed is a picture of one of the pistons and the three set of =
rings. <u></u><u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US"=
><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US"=
>I am no expert but according to his explanation: Starting from the right,=
=C2=A0 the first thick ring on the picture is the compression ring. The mid=
dle or second set includes two additional thin compression rings and what s=
eems like an heptagon that I understand helps keep the rings open. The thir=
d set includes three lubrication rings.=C2=A0 <u></u><u></u></span></p><p c=
lass=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p><p c=
lass=3D"MsoNormal"><span lang=3D"EN-US">He mentioned that the middle set of=
two thin compression rings with the heptagon is not a very common configur=
ation. He was wondering whether they could be substituted with one regular =
compression ring. <u></u><u></u></span></p><p class=3D"MsoNormal"><span lan=
g=3D"EN-US"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span lan=
g=3D"EN-US">He has worked before on a Healey engine and he doesn=C2=B4t rec=
all pistons with the grooves on the side like the one on the picture. I gue=
ss the groove design helps with the lubrication and cooling of the pistons.=
Are these original pistons? Would you recommend changing them?<u></u><u></=
u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></=
u></span></p><p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks in advance =
for your comments.<u></u><u></u></span></p><p class=3D"MsoNormal"><span lan=
g=3D"EN-US"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span lan=
g=3D"EN-US">Best regards,<u></u><u></u></span></p><p class=3D"MsoNormal"><s=
pan lang=3D"EN-US">Rafael<u></u><u></u></span></p><p class=3D"MsoNormal"><s=
pan lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p></div></div><br></div></d=
iv>_______________________________________________<br>
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<br></blockquote></div><span class=3D"HOEnZb"><font color=3D"#888888"><br><=
br clear=3D"all"><br>-- <br><div><div dir=3D"ltr"><div><div dir=3D"ltr"><i>=
<font><span style=3D"color:black">If you can't fix it with a hammer, yo=
u've got an electrical problem.</span></font></i><br><br><div></div><di=
v></div><div></div></div></div></div></div>
</font></span></div>
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