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Utube video most will find instructive.. Offset Woodruff keys are
generally available or veneer cam gears are..
https://www.youtube.com/watch?v=n_9rUXYxAY0 (part 1)
On 2/14/2019 5:53 AM, David Porter wrote:
>
> Given that the timing of the cam opening and closing the valves is
> critical to the engine performance, where as little as four degrees
> variation of cam position relative to the piston at TDC and BTDC can
> rob a lot of performance. Books h ave been written on this. Best
> advice is to always follow the cam manufacturers spec. sheet regarding
> lash adjustments. It's ALL about timing.
> Unfortunately, I've never seen factory cam specs, aside from
> opening/closing timing. A degree wheel is really an essential part of
> engine assembly. DP
>
>
>
> On February 13, 2019, at 11:47 PM, Chris Dimmock
> <austin.healey@gmail.com> wrote:
>
>
> Isn't part of the reason that the valve dissipates heat into the head
> when it is seated, so part of the reason for valve clearance is to
> allow the valve to cool?
> Maybe try a 4 thou valve clearance and see how it goes?
> I probably won't!!
> :-)
> Chris
>
> Sent from my iPhone
>
> On 14 Jan 2019, at 10:23 am, Michael Salter <michael.salter@gmail.com
>
>> This is another subject that I often wonder about.
>> If the valve clearance is there to ensure that the valves are fully
>> closed when the engine is hot then why, when I check the clearances
>> on a hot engine after a dyno run, are they hardly any less than they
>> were cold?
>> I can appreciate that the valve train components grow because of the
>> heat but surely the block and head and rocker shaft pedistals also
>> grow and thus there is little if any net change.
>> I also appreciate that the exhaust valve stem get really hot but ????
>> Just wondering....
>>
>> M
>>
>> On Sun, Jan 13, 2019, 6:42 AM WILLIAM B LAWRENCE <ynotink@msn.com
>>
>> I disagree that valve clearances are not critical. As the engine
>> comes up to temperature the metal parts of the valve train
>> (valves, lifters, push rods, the head itself and the rocker shaft
>> towers) increase in length and the valve clearances are
>> calculated to assure that this expansion isn't allowed to affect
>> the sealing of the valves on their seats. If the valves are set
>> too tight they reach a point where they won't touch the seats and
>> therefore won't seal. Hot gases rushing through the gaps will
>> quickly erode the valves. Also increasing the duration and/or
>> lift of the cam has the effect of the  decreasing the length of
>> the opening and closing ramps on the back side of the cam This
>> reduces the length of time (dwell) the valve remains on the seat.
>> Increasing the valve clearance restores the dwell time the valve
>> needs to transfer its heat load to the cooling system through the
>> valve seat and the cylinder head. Too little dwell time or the
>> lack of proper valve sealing are two causes of burned valves.
>>
>> In my own experience I installed an Isky cam with a grind a
>> little more aggressive than the 100M cam and set the clearances
>> to 0.012" per the manual. Within about 2,000 miles the exhaust
>> valves were trashed. I then took the time to read the Isky
>> installation instructions which specifically state the valve
>> clearance needs to be set to 0.018". I re-installed the head with
>> new valves and set them to Isky's spec and never had another
>> problem with burned valves.
>>
>> Follow the cam grinder's recommendations and you will avoid trouble.
>>
>> Bill Lawrence
>> BN1 #554
>> ------------------------------------------------------------------------
>> *From:* Healeys <healeys-bounces@autox.team.net
>> *Sent:* Saturday, January 12, 2019 11:10 PM
>> *To:* Michael MacLean; healeys@autox.team.net
>> *Subject:* Re: [Healeys] Valve clearances
>>
>> I should note the rockers are pretty noisy at 0.015; IIRC I
>> tightened them up just a bit.
>>
>> On 1/12/2019 2:39 PM, Michael MacLean wrote:
>>> I'd go with .016. You can always tighten it. Better loose than
>>> tight.
>>> Mike MacLean
>>>
>>> On Saturday, January 12, 2019, 11:01:32 AM PST, Bob Spidell
>>>
>>>
>>> Makes sense (for some reason). I put a DWR1 cam in my BJ8
>>> which, according to DWR, 'is a little better than the BJ8 cam
>>> and so works well in any standard or mildly tuned car' but I
>>> think the 0.015" applies to all profiles on the spec sheet.
>>>
>>> Bob
>>>
>>> On 1/11/2019 8:48 PM, John Rowe wrote:
>>>
>>> Simon,
>>>
>>> Modified cams require the large clearance (donâ??t ask me why?) So
>>> go for .015 that is what mine is.
>>>
>>> John Rowe
>>>
>>> Qld
>>>
>>> Australia
>>>
>>> *From:*Healeys [mailto:healeys-bounces@autox.team.net] *On
>>> Behalf Of *simon.lachlan@alexarevel.plus.com
>>> *Sent:* Saturday, 12 January 2019 9:14 AM
>>> *To:* Healeys
>>> *Subject:* [Healeys] Valve clearances
>>>
>>> The car is a MkII BT7.
>>>
>>> The BMC manual says adjust the clearances, cold, to 0.012â??.
>>>
>>> Denis Welch said I should go 0.015â??, cold, after fitting their
>>> â??Fast Roadâ?? cam.
>>>
>>> The rolling road guy said 0.016â??, warm.
>>>
>>> I have the radiator out right now so I can get a nice socket
>>> onto that nut and have a go at the clearances.
>>>
>>> Stick with 0.015â??, cold?
>>>
>>> Thanks,
>>>
>>> Simon
>>>
>>>
>>>
>>>
>>>
>
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation $12.75
>
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>
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--
Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My World
go here: WWW.PORTERBIKES.COM/
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<html>
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<p>Utube video most will find instructive.. Offset Woodruff keys
are generally available or veneer cam gears are..
<a class="moz-txt-link-freetext"
href="https://www.youtube.com/watch?v=n_9rUXYxAY0";>https://www.youtube.com/watch?v=n_9rUXYxAY0</a>
(part 1)<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 2/14/2019 5:53 AM, David Porter
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:fkfuysr2c6v9cbcyjkx3spqt.1550148827923@email.android.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<style>@font-face{font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2
4;}</style><font
face="Calibri">
<p dir="ltr">Given that the timing of the cam opening and
closing the valves is critical to the engine performance,
where as little as four degrees variation of cam position
relative to the piston at TDC and BTDC can rob a lot of
performance. Books h ave been written on this. Best advice is
to always follow the cam manufacturers spec. sheet regarding
lash adjustments. It's ALL about timing.<br>
Unfortunately, I've never seen factory cam specs, aside from
opening/closing timing. A degree wheel is really an essential
part of engine assembly. DP</p>
<br>
<br>
On February 13, 2019, at 11:47 PM, Chris Dimmock
<a class="moz-txt-link-rfc2396E"
href="mailto:austin.healey@gmail.com";><austin.healey@gmail.com></a>
wrote:<br>
<br>
<br>
</font>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div>Isn't part of the reason that the valve dissipates heat into
the head when it is seated, so part of the reason for valve
clearance is to allow the valve to cool?</div>
<div id="AppleMailSignature">Maybe try a 4 thou valve clearance
and see how it goes? </div>
<div id="AppleMailSignature">I probably won't!! </div>
<div id="AppleMailSignature">:-)</div>
<div id="AppleMailSignature">Chris <br>
<br>
Sent from my iPhone</div>
<div><br>
On 14 Jan 2019, at 10:23 am, Michael Salter <<a
href="mailto:michael.salter@gmail.com";
moz-do-not-send="true">michael.salter@gmail.com</a>>
wrote:<br>
<br>
</div>
<blockquote type="cite">
<div>
<div dir="auto">This is another subject that I often wonder
about.Â
<div dir="auto">If the valve clearance is there to ensure
that the valves are fully closed when the engine is hot
then why, when I check the clearances on a hot engine
after a dyno run, are they hardly any less than they were
cold?</div>
<div dir="auto">I can appreciate that the valve train
components grow because of the heat but surely the block
and head and rocker shaft pedistals also grow and thus
there is little if any net change.</div>
<div dir="auto">I also appreciate that the exhaust valve
stem get really hot but ????</div>
<div dir="auto">Just wondering....</div>
<div dir="auto"><br>
</div>
<div dir="auto">M</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Sun, Jan 13, 2019, 6:42 AM WILLIAM B
LAWRENCE <<a href="mailto:ynotink@msn.com";
moz-do-not-send="true">ynotink@msn.com</a> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div
style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">I
disagree that valve clearances are not critical. As
the engine comes up to temperature the metal parts of
the valve train (valves, lifters, push rods, the head
itself and the rocker shaft towers) increase in length
and the valve clearances are calculated to assure that
this expansion isn't allowed to affect the sealing of
the valves on their seats. If the valves are set too
tight they reach a point where they won't touch the
seats and therefore won't seal. Hot gases rushing
through the gaps will quickly erode the valves. Also i<span
style="font-family:Calibri,Helvetica,sans-serif;background-color:rgb(255,255,255);display:inline!important">ncreasing
the duration and/or lift of the cam has the effect
of the  decreasing the length of the opening and
closing ramps on the back side of the cam This
reduces the length of time (dwell) the valve remains
on the seat. Increasing the valve clearance restores
the dwell time the valve needs to transfer its heat
load to the cooling system through the valve seat
and the cylinder head. Too little dwell time or the
lack of proper valve sealing are two causes of
burned valves.</span></div>
<div
style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)"><br>
</div>
<div
style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">In
my own experience I installed an Isky cam with a grind
a little more aggressive than the 100M cam and set the
clearances to 0.012" per the manual. Within about
2,000 miles the exhaust valves were trashed. I then
took the time to read the Isky installation
instructions which specifically state the valve
clearance needs to be set to 0.018". I re-installed
the head with new valves and set them to Isky's spec
and never had another problem with burned valves.</div>
<div
style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)"><br>
</div>
<div
style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">Follow
the cam grinder's recommendations and you will avoid
trouble.</div>
<div
style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)"><br>
</div>
<div
style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">Bill
Lawrence</div>
<div
style="font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">BN1
#554</div>
<hr style="display:inline-block;width:98%">
<div id="m_1603937236670712738divRplyFwdMsg" dir="ltr"><font
style="font-size:11pt" face="Calibri, sans-serif"
color="#000000"><b>From:</b> Healeys <<a
href="mailto:healeys-bounces@autox.team.net";
target="_blank" rel="noreferrer"
moz-do-not-send="true">healeys-bounces@autox.team.net</a>>
on behalf of Bob Spidell <<a
href="mailto:bspidell@comcast.net"; target="_blank"
rel="noreferrer"
moz-do-not-send="true">bspidell@comcast.net</a>><br>
<b>Sent:</b> Saturday, January 12, 2019 11:10 PM<br>
<b>To:</b> Michael MacLean; <a
href="mailto:healeys@autox.team.net";
target="_blank" rel="noreferrer"
moz-do-not-send="true">healeys@autox.team.net</a><br>
<b>Subject:</b> Re: [Healeys] Valve clearances</font>
<div>Â </div>
</div>
<div style="background-color:#ffffff">
<p>I should note the rockers are pretty noisy at
0.015; IIRC I tightened them up just a bit.<br>
</p>
<div class="m_1603937236670712738x_moz-cite-prefix">On
1/12/2019 2:39 PM, Michael MacLean wrote:<br>
</div>
<blockquote type="cite">
<div
class="m_1603937236670712738x_ydpe1d3e9c5yahoo-style-wrap"
style="font-family:times new roman,new
york,times,serif;font-size:16px">
<div>I'd go with .016. You can always tighten
it. Better loose than tight.</div>
<div>Mike MacLean<br>
</div>
<div><br>
</div>
</div>
<div
id="m_1603937236670712738x_yahoo_quoted_8268064185"
class="m_1603937236670712738x_yahoo_quoted">
<div style="font-family:'Helvetica
Neue',Helvetica,Arial,sans-serif;font-size:13px;color:#26282a">
<div>On Saturday, January 12, 2019, 11:01:32 AM
PST, Bob Spidell <a
class="m_1603937236670712738x_moz-txt-link-rfc2396E"
href="mailto:bspidell@comcast.net";
target="_blank" rel="noreferrer"
moz-do-not-send="true">
<bspidell@comcast.net></a> wrote: </div>
<div><br>
</div>
<div><br>
</div>
<div>
<div id="m_1603937236670712738x_yiv1110160614">
<div>
<p>Makes sense (for some reason). I put a
DWR1 cam in my BJ8 which, according to
DWR, 'is a little better than the BJ8
cam and so works well in any standard or
mildly tuned car' but I think the 0.015"
applies to all profiles on the spec
sheet.<br clear="none">
</p>
<p>Bob<br clear="none">
</p>
<div
class="m_1603937236670712738x_yiv1110160614yqt0287165987"
id="m_1603937236670712738x_yiv1110160614yqt70378">
<div
class="m_1603937236670712738x_yiv1110160614moz-cite-prefix">On
1/11/2019 8:48 PM, John Rowe wrote:<br
clear="none">
</div>
</div>
</div>
<div
class="m_1603937236670712738x_yiv1110160614yqt0287165987"
id="m_1603937236670712738x_yiv1110160614yqt92654">
<div>
<div
class="m_1603937236670712738x_yiv1110160614WordSection1">
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
style="color:#1f497d">Simon,</span></p>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
style="color:#1f497d">Modified
cams require the large clearance
(donâ??t ask me why?) So go for .015
that is what mine is.</span></p>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
style="color:#1f497d">John Rowe</span></p>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
style="color:#1f497d">Qld</span></p>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
style="color:#1f497d">Australia</span></p>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
style="color:#1f497d">Â </span></p>
<div>
<div
style="border:none;border-top:solid
#b5c4df 1.0pt;padding:3.0pt 0cm
0cm 0cm">
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><b><span
style="font-size:10.0pt"
lang="EN-US">From:</span></b><span
style="font-size:10.0pt"
lang="EN-US"> Healeys [<a
rel="nofollow noreferrer"
shape="rect"
class="m_1603937236670712738x_yiv1110160614moz-txt-link-freetext"
href="mailto:healeys-bounces@autox.team.net"; target="_blank"
moz-do-not-send="true">mailto:healeys-bounces@autox.team.net</a>]
<b>On Behalf Of </b><a
rel="nofollow noreferrer"
shape="rect"
class="m_1603937236670712738x_yiv1110160614moz-txt-link-abbreviated"
href="mailto:simon.lachlan@alexarevel.plus.com"; target="_blank"
moz-do-not-send="true">simon.lachlan@alexarevel.plus.com</a><br
clear="none">
<b>Sent:</b> Saturday, 12
January 2019 9:14 AM<br
clear="none">
<b>To:</b> Healeys<br
clear="none">
<b>Subject:</b> [Healeys]
Valve clearances</span></p>
</div>
</div>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal">Â </p>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
lang="EN-GB">The car is a MkII
BT7.</span></p>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
lang="EN-GB">The BMC manual says
adjust the clearances, cold, to
0.012â??.</span></p>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
lang="EN-GB">Denis Welch said I
should go 0.015â??, cold, after
fitting their â??Fast Roadâ??
cam.</span></p>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
lang="EN-GB">The rolling road guy
said 0.016â??, warm.</span></p>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
lang="EN-GB">Â </span></p>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
lang="EN-GB">I have the radiator
out right now so I can get a nice
socket onto that nut and have a go
at the clearances.</span></p>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
lang="EN-GB">Stick with 0.015â??,
cold?</span></p>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
lang="EN-GB">Â </span></p>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
lang="EN-GB">Thanks,</span></p>
<p
class="m_1603937236670712738x_yiv1110160614MsoNormal"><span
lang="EN-GB">Simon</span></p>
</div>
<br>
</div>
</div>
</div>
</div>
</div>
</div>
<div
id="m_1603937236670712738x_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2">
<table style="border-top:1px solid #d3d4de">
<tbody>
<tr>
<td style="width:55px;padding-top:13px"><br>
</td>
<td
style="width:470px;padding-top:12px;color:#41424e;font-size:13px;font-family:Arial,Helvetica,sans-serif;line-height:18px"><br>
</td>
</tr>
</tbody>
</table>
</div>
</blockquote>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre"
wrap="">_______________________________________________
Archive: <a class="moz-txt-link-freetext"
href="http://www.team.net/pipermail/healeys";>http://www.team.net/pipermail/healeys</a>
<a class="moz-txt-link-freetext"
href="http://autox.team.net/archive";>http://autox.team.net/archive</a>
<a class="moz-txt-link-abbreviated"
href="mailto:Healeys@autox.team.net";>Healeys@autox.team.net</a>
<a class="moz-txt-link-freetext"
href="http://autox.team.net/mailman/listinfo/healeys";>http://autox.team.net/mailman/listinfo/healeys</a>
</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My World
go here: <a class="moz-txt-link-abbreviated"
href="http://WWW.PORTERBIKES.COM/";>WWW.PORTERBIKES.COM/</a></pre>
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