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Thanks to all.
Relieved to hear that skimming the pistons is standard practice. The new
ones look soo pristine too !
Of course the supplier had never had this problem. The compression height
is definitely different to standard pistons.
A few response BTW's
The original porosity problem is not the usual oil (at 50 psi) into the
coolant (at say 3 psi) but coolant at atmospheric or slightly above, back
into atmosphere via a porous water gallery and draining back into sump.
Yes did all the usual measurements of block height from crank center line.
Now lightly assembling the crank with #1 and #6 without rings to check
clearances.
I may be wrong but feel that the Wolseley block had never been opened
before so still a bit of a mystery.
rg
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On Wed, Aug 20, 2025 at 6:23=E2=80=AFPM <jvwojcik@comcast.net> wrote:
> Hi Roger. Familiar problem. That porosity made me crazy and my first
> engine rebuild using several standard repair efforts made me weep. Then
> went to a hot rod engine builder who used Hard Blok,
> https://www.hardblok.com/
>
> a product used by drag race engine builders. He dipped the block, poured
> this into the jacket, and rolled the block to make Hard Blok flow to the
> porosity area. It truly worked, and I had no further problems over the ne=
xt
> 10 years of ownership.
>
>
>
> As far as pistons, he installed Ross forged aluminum pistons that were
> about 50% lighter than stock, and had modern rings and a much shorter
> skirt. Again, never a problem. Engines have evolved and I think it isn=E2=
=80=99t
> necessary to keep using old tech to build a classic engine unless you hav=
e
> a 250 GTO or such. Happy to chat if desired. Jim
>
>
>
>
>
>
>
> *From:* Healeys <healeys-bounces@autox.team.net> *On Behalf Of *Roger
> Grace
> *Sent:* Wednesday, August 20, 2025 12:47 AM
> *To:* Healeys <healeys@autox.team.net>
> *Subject:* [Healeys] Forged pistons
>
>
>
> Late model BJ8
>
> In the process of changing out the block (because of a porosity coolant
> leak into the oil drain back).
>
> Managed to find a Wolseley 110 saloon block of similar vintage. I do
> believe that it was original and had not been previously opened. Everythi=
ng
> seemed the same and interchangeable with my original bock. Well almost ..=
.
>
> While the engine is in bits decided to do some upgrades - pots re bore,
> crank grind, balancing, new pistons etc. etc. Now discover that the pots
> are about 25 thou shorter than the original. Any thought as to reason ? I
> note that the Wolseley block had concave piston crowns. Maybe to reduce
> compression for a saloon car and the block decked to set the final
> compression ?
>
> To add to this problem decided to spring for a set of AH Spares forged
> pistons. Surprise surprise the compression length is about 18 thou longer
> than standard BJ8 pistons. These variances might seem trivial but they ar=
e
> consequential. So now will likely have to machine the forged piston crown=
s
> or as a last resort consider a block shim. All rather painful !
>
> Any thoughts or ideas appreciated.
>
> rg
>
>
>
>
>
>
> <http://www.avg.com/email-signature?utm_medium=3Demail&utm_source=3Dlink&=
utm_campaign=3Dsig-email&utm_content=3Dwebmail>
>
> Virus-free.www.avg.com
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>
>
>
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:large">Tha=
nks to all.</div><div class=3D"gmail_default" style=3D"font-size:large">Rel=
ieved to hear that skimming the pistons is standard practice. The new ones =
look soo pristine too !</div><div class=3D"gmail_default" style=3D"font-siz=
e:large">Of course the supplier had never had this problem. The compression=
height is definitely different to standard pistons.</div><div class=3D"gma=
il_default" style=3D"font-size:large">A few response BTW's</div><div cl=
ass=3D"gmail_default" style=3D"font-size:large">The original porosity probl=
em is not the usual oil (at 50 psi) into the coolant (at say 3 psi) but coo=
lant at atmospheric or slightly above, back into atmosphere via a=C2=A0poro=
us water gallery and draining back into sump.</div><div class=3D"gmail_defa=
ult" style=3D"font-size:large">Yes did all the usual measurements=C2=A0of b=
lock height from crank center line.</div><div class=3D"gmail_default" style=
=3D"font-size:large">Now lightly assembling the crank with #1 and #6 withou=
t rings to check clearances.</div><div class=3D"gmail_default" style=3D"fon=
t-size:large">I may be wrong but feel that the Wolseley=C2=A0block had neve=
r been opened before so still a bit of a mystery.</div><div class=3D"gmail_=
default" style=3D"font-size:large">rg</div><div class=3D"gmail_default" sty=
le=3D"font-size:large"><br></div><div class=3D"gmail_default" style=3D"font=
-size:large">=C2=A0</div><div class=3D"gmail_default" style=3D"font-size:la=
rge"><br></div></div><div id=3D"DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br><=
table style=3D"border-top:1px solid #d3d4de"><tr><td style=3D"width:55px;pa=
dding-top:13px"><a href=3D"http://www.avg.com/email-signature?utm_medium=3D=
email&utm_source=3Dlink&utm_campaign=3Dsig-email&utm_content=3D=
webmail" target=3D"_blank"><img src=3D"https://s-install.avcdn.net/ipm/prev=
iew/icons/icon-envelope-tick-green-avg-v1.png" alt=3D"" width=3D"46" height=
=3D"29" style=3D"width: 46px; height: 29px;"></a></td><td style=3D"width:47=
0px;padding-top:12px;color:#41424e;font-size:13px;font-family:Arial,Helveti=
ca,sans-serif;line-height:18px">Virus-free.<a href=3D"http://www.avg.com/em=
ail-signature?utm_medium=3Demail&utm_source=3Dlink&utm_campaign=3Ds=
ig-email&utm_content=3Dwebmail" target=3D"_blank" style=3D"color:#4453e=
a">www.avg.com</a></td></tr></table><a href=3D"#DAB4FAD8-2DD7-40BB-A1B8-4E2=
AA1F9FDF2" width=3D"1" height=3D"1"></a></div><br><div class=3D"gmail_quote=
gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Aug 2=
0, 2025 at 6:23=E2=80=AFPM <<a href=3D"mailto:jvwojcik@comcast.net";>jvwo=
jcik@comcast.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote" =
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pa=
dding-left:1ex"><div class=3D"msg-1576467335299172427"><div lang=3D"EN-US" =
style=3D"overflow-wrap: break-word;"><div class=3D"m_-1576467335299172427Wo=
rdSection1"><p class=3D"MsoNormal"><span style=3D"font-size:11pt">Hi Roger.=
Familiar problem. That porosity made me crazy and my first engine rebuild =
using several standard repair efforts made me weep. Then went to a hot rod =
engine builder who used Hard Blok, <a href=3D"https://www.hardblok.com/"; ta=
rget=3D"_blank">https://www.hardblok.com/</a><u></u><u></u></span></p><p cl=
ass=3D"MsoNormal"><span style=3D"font-size:11pt"> a product used by drag ra=
ce engine builders. He dipped the block, poured this into the jacket, and r=
olled the block to make Hard Blok flow to the porosity area. It truly worke=
d, and I had no further problems over the next 10 years of ownership.<u></u=
><u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u=
></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-siz=
e:11pt">As far as pistons, he installed Ross forged aluminum pistons that w=
ere about 50% lighter than stock, and had modern rings and a much shorter s=
kirt. Again, never a problem. Engines have evolved and I think it isn=E2=80=
=99t necessary to keep using old tech to build a classic engine unless you =
have a 250 GTO or such. Happy to chat if desired. Jim<u></u><u></u></span><=
/p><p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u></u>=C2=A0<u></=
u></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u></u>=
=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11p=
t"><u></u>=C2=A0<u></u></span></p><div style=3D"border-width:1pt medium med=
ium;border-style:solid none none;border-color:rgb(225,225,225) currentcolor=
currentcolor;padding:3pt 0in 0in"><p class=3D"MsoNormal"><b><span style=3D=
"font-size:11pt;font-family:"Calibri",sans-serif">From:</span></b=
><span style=3D"font-size:11pt;font-family:"Calibri",sans-serif">=
Healeys <<a href=3D"mailto:healeys-bounces@autox.team.net"; target=3D"_b=
lank">healeys-bounces@autox.team.net</a>> <b>On Behalf Of </b>Roger Grac=
e<br><b>Sent:</b> Wednesday, August 20, 2025 12:47 AM<br><b>To:</b> Healeys=
<<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank">healeys@au=
tox.team.net</a>><br><b>Subject:</b> [Healeys] Forged pistons<u></u><u><=
/u></span></p></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><di=
v><p style=3D"margin-bottom:0in"><span style=3D"font-size:18pt">Late model =
BJ8<u></u><u></u></span></p><p style=3D"margin-bottom:0in"><span style=3D"f=
ont-size:18pt">In the process of changing out the block (because of a poros=
ity coolant leak into the oil drain back).<u></u><u></u></span></p><p style=
=3D"margin-bottom:0in"><span style=3D"font-size:18pt">Managed to find a Wol=
seley 110 saloon block of similar vintage. I do believe that it was origina=
l and had not been previously opened. Everything seemed the same and interc=
hangeable with my original bock. Well almost ...<u></u><u></u></span></p><p=
style=3D"margin-bottom:0in"><span style=3D"font-size:18pt">While the engin=
e is in bits decided to do some upgrades - pots re bore, crank grind, balan=
cing, new pistons etc. etc. Now discover that the pots are about 25 thou sh=
orter than the original. Any thought as to reason ? I note that the Wolsele=
y block had concave piston crowns. Maybe to reduce compression for a saloon=
car and the block decked to set the final compression ?<u></u><u></u></spa=
n></p><p style=3D"margin-bottom:0in"><span style=3D"font-size:18pt">To add =
to this problem decided to spring for a set of AH Spares forged pistons. Su=
rprise surprise the compression length is about 18 thou longer than standar=
d BJ8 pistons. These variances might seem trivial but they are consequentia=
l. So now will likely have to machine the forged piston crowns or as a last=
resort consider a block shim. All rather painful !<u></u><u></u></span></p=
><p style=3D"margin-bottom:0in"><span style=3D"font-size:18pt">Any thoughts=
or ideas appreciated.<u></u><u></u></span></p><p style=3D"margin-bottom:0i=
n"><span style=3D"font-size:18pt">rg<u></u><u></u></span></p><p class=3D"Ms=
oNormal"><span style=3D"font-size:18pt"><u></u>=C2=A0<u></u></span></p></di=
v></div><div id=3D"m_-1576467335299172427DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FD=
F2"><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><table border=3D"1" cell=
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der-style:solid none none;border-color:rgb(211,212,222) currentcolor curren=
tcolor"><tbody><tr><td width=3D"55" style=3D"width:41.25pt;border:medium;pa=
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g:9pt 0.75pt 0.75pt"><p class=3D"MsoNormal" style=3D"line-height:13.5pt"><s=
pan style=3D"font-size:10pt;font-family:"Arial",sans-serif;color:=
rgb(65,66,78)">Virus-free.<a href=3D"http://www.avg.com/email-signature?utm=
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ww.avg.com</span></a><u></u><u></u></span></p></td></tr></tbody></table><p =
class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div></div></div></div></block=
quote></div>
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