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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.
Op 26-8-2024 om 16:43 schreef Bob Spidell via Healeys:
> 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.
>
>
> On 8/25/2024 7:44 AM, Michael Salter wrote:
>> I am still using cast iron heads on both my 100's. Amazingly neither
>> have serious cracks as are so common on these.
>> 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.
>> I'm contemplating installing hardened seats in one.
>> Hase anyone done this successfully?
>
>
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<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>
</p>
<div class="moz-cite-prefix">Op 26-8-2024 om 16:43 schreef Bob
Spidell via Healeys:<br>
</div>
<blockquote type="cite"
cite="mid:8e705fbd-669e-4eee-8d5f-46271f0c6dc7@comcast.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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>
<br>
<br>
<div class="moz-cite-prefix">On 8/25/2024 7:44 AM, Michael Salter
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAB3i7LKTyrKV_um-Zrf-T8JQpe2OMNdEA-Jt3WQuYAsXtH-mQw@mail.gmail.com">
<meta http-equiv="content-type"
content="text/html; charset=UTF-8">
<div dir="auto">I am still using cast iron heads on both my
100's. Amazingly neither have serious cracks as are so common
on these.
<div dir="auto">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. </div>
<div dir="auto">I'm contemplating installing hardened seats in
one. </div>
<div dir="auto">Hase anyone done this successfully?</div>
</div>
<span style="white-space: pre-wrap">
</span></blockquote>
<br>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre wrap=""
class="moz-quote-pre">_______________________________________________
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</pre>
</blockquote>
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