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I would still=C2=A0 put in a lead additive. MDR Relead is no longer made bu=
t there are others. It=E2=80=99s cheap insurance. And yes, I would not add =
hardened valve seats because of the likelihood of cylinder head cracks as a=
result. The alloy heads come with those=E2=80=94at a steep price!=C2=A0
Sent from the all new AOL app for iOS
On Monday, August 26, 2024, 11:43 AM, Kees Oudesluijs via Healeys <healeys@=
autox.team.net> wrote:
=20
In most cases hardened valve seats were/are not necessary. There was only a=
small handful of engines that gave trouble after introducing lead free pet=
rol.
=20
Op 26-8-2024 om 16:43 schreef Bob Spidell via Healeys:
=20
=20
My dad had our BN2/100M's head redone--valves, guides, etc.--by a local sp=
eed shop we trust (the machinist is a meticulous Kiwi who Dad said got real=
ly excited when he saw 'Weslake' cast in the head). Unfortunately, Dad isn'=
t around to ask, but they almost certainly installed hardened exhaust valve=
seats; it's been SOP since, well, since lead was removed from gas. No issu=
es, and I had it out on the road a couple weeks ago.=20
=20
=20
On 8/25/2024 7:44 AM, Michael Salter wrote:
=20
=20
I am still using cast iron heads on both my 100's. Amazingly neither have s=
erious cracks as are so common on these. I am really picky and don't partic=
ularly like the different sound that a 100 engine with an aluminium head ma=
kes so would like to continue using these cast iron ones.=C2=A0 I'm contemp=
lating installing hardened seats in one.=C2=A0 Hase anyone done this succes=
sfully? =20
=20
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<html xmlns=3D"http://www.w3.org/1999/xhtml"; xmlns:v=3D"urn:schemas-microso=
ft-com:vml" xmlns:o=3D"urn:schemas-microsoft-com:office:office"><head><!--[=
if gte mso 9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>=
96</o:PixelsPerInch></o:OfficeDocumentSettings></xml><![endif]--></head><bo=
dy>
I would still put in a lead additive. MDR Relead is no longer made bu=
t there are others. It=E2=80=99s cheap insurance. And yes, I would not add =
hardened valve seats because of the likelihood of cylinder head cracks as a=
result. The alloy heads come with those=E2=80=94at a steep price! <br=
><br><br><div class=3D"yahoo-signature"><a style=3D"font-size:12px" href=3D=
"https://apps.apple.com/us/app/aol-news-email-weather-video/id646100661"; ta=
rget=3D"_blank" rel=3D"noreferrer noopener">Sent from the all new AOL app f=
or iOS</a><br></div><br><p class=3D"yahoo-quoted-begin" style=3D"font-size:=
15px; color: rgb(132, 115, 255); padding-top: 15px; margin-top: 0px;">On M=
onday, August 26, 2024, 11:43 AM, Kees Oudesluijs via Healeys <healeys@a=
utox.team.net> wrote:</p><blockquote class=3D"iosymail"><div id=3D"yiv32=
11935178"><div>
<p>In most cases hardened valve seats were/are not necessary. There
was only a small handful of engines that gave trouble after
introducing lead free petrol.<br clear=3D"none">
</p>
<div id=3D"yiv3211935178yqtfd64034" class=3D"yiv3211935178yqt4834159380=
"><div class=3D"yiv3211935178moz-cite-prefix">Op 26-8-2024 om 16:43 schreef=
Bob
Spidell via Healeys:<br clear=3D"none">
</div>
<blockquote type=3D"cite">
</blockquote></div></div><div id=3D"yiv3211935178yqtfd05068" class=3D=
"yiv3211935178yqt4834159380"><div>
My dad had our BN2/100M's head redone--valves, guides, etc.--by a
local speed shop we trust (the machinist is a meticulous Kiwi who
Dad said got really excited when he saw 'Weslake' cast in the
head). Unfortunately, Dad isn't around to ask, but they almost
certainly installed hardened exhaust valve seats; it's been SOP
since, well, since lead was removed from gas. No issues, and I had
it out on the road a couple weeks ago. <br clear=3D"none">
<br clear=3D"none">
<br clear=3D"none">
<div class=3D"yiv3211935178moz-cite-prefix">On 8/25/2024 7:44 AM, Mic=
hael Salter
wrote:<br clear=3D"none">
</div>
<blockquote type=3D"cite">
</blockquote></div></div><div><div id=3D"yiv3211935178yqtfd68782" c=
lass=3D"yiv3211935178yqt4834159380"><div>I am still using cast iron heads o=
n both my
100's. Amazingly neither have serious cracks as are so common
on these.
<div>I am really picky and don't particularly like
the different sound that a 100 engine with an aluminium head
makes so would like to continue using these cast iron ones.&nbs=
p;</div>
<div>I'm contemplating installing hardened seats in
one. </div>
<div>Hase anyone done this successfully?</div>
</div>
<span style=3D"white-space:pre-wrap;">
</span>
<br clear=3D"none">
<br clear=3D"none">
<fieldset class=3D"yiv3211935178moz-mime-attachment-header"></fieldse=
t>
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</pre>
=20
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