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Extra wear on camshaft, tappets, followers and valve stems because of
the higher impact loads.
KKees Oudesluijs
Op 13-1-2019 om 23:42 schreef i erbs:
> What issues with too wide a gap?
>
> Ira Erbs
> Portland, OR
> typos and artifacts are the fault of my phone
>
> On Sun, Jan 13, 2019, 11:10 AM David P <frogeye@porterscustom.com
>
> Absolutely correct......
>
>
> On 1/12/2019 11:26 PM, WILLIAM B LAWRENCE wrote:
>> 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.Nethttp://www.team.net/donate.html
>> Suggested annual donation $12.75
>>
>> Archive:http://www.team.net/pipermail/healeys
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>>
>>
>> Unsubscribe/Manage:http://autox.team.net/mailman/options/healeys/frogeye@porterscustom.com
>>
> --
> Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My
> World go here:WWW.PORTERBIKES.COM/ <http://WWW.PORTERBIKES.COM/>
>
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
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<p>Extra wear on camshaft, tappets, followers and valve stems
because of the higher impact loads.</p>
<p>KKees Oudesluijs</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Op 13-1-2019 om 23:42 schreef i erbs:<br>
</div>
<blockquote type="cite"
cite="mid:CABXhz88jGU=1jQL86Q_E2730UQvLn+aExMKuMohUKNmQLsxkqA@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">What issues with too wide a gap?<br>
<br>
<div data-smartmail="gmail_signature">Ira Erbs<br>
Portland, OR<br>
typos and artifacts are the fault of my phone</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Sun, Jan 13, 2019, 11:10 AM David P <<a
href="mailto:frogeye@porterscustom.com";
moz-do-not-send="true">frogeye@porterscustom.com</a> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>Absolutely correct......</p>
<p><br>
</p>
<div class="m_-3760638066444155266moz-cite-prefix">On
1/12/2019 11:26 PM, WILLIAM B LAWRENCE wrote:<br>
</div>
<blockquote type="cite">
<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_-3760638066444155266divRplyFwdMsg" dir="ltr"><font
style="font-size:11pt" face="Calibri, sans-serif"
color="#000000"><b>From:</b> Healeys <a
class="m_-3760638066444155266moz-txt-link-rfc2396E"
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
class="m_-3760638066444155266moz-txt-link-rfc2396E"
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
class="m_-3760638066444155266moz-txt-link-abbreviated"
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_-3760638066444155266x_moz-cite-prefix">On
1/12/2019 2:39 PM, Michael MacLean wrote:<br>
</div>
<blockquote type="cite">
<div
class="m_-3760638066444155266x_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.Â
Better loose than tight.</div>
<div>Mike MacLean<br>
</div>
<div><br>
</div>
</div>
<div
id="m_-3760638066444155266x_yahoo_quoted_8268064185"
class="m_-3760638066444155266x_yahoo_quoted">
<div>
<div>On Saturday, January 12, 2019, 11:01:32 AM
PST, Bob Spidell <a
class="m_-3760638066444155266x_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_-3760638066444155266x_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_-3760638066444155266x_yiv1110160614yqt0287165987"
id="m_-3760638066444155266x_yiv1110160614yqt70378">
<div
class="m_-3760638066444155266x_yiv1110160614moz-cite-prefix">On
1/11/2019 8:48 PM, John Rowe wrote:<br
clear="none">
</div>
</div>
</div>
<div
class="m_-3760638066444155266x_yiv1110160614yqt0287165987"
id="m_-3760638066444155266x_yiv1110160614yqt92654">
<div>
<div
class="m_-3760638066444155266x_yiv1110160614WordSection1">
<p
class="m_-3760638066444155266x_yiv1110160614MsoNormal"><span
style="color:#1f497d">Simon,</span></p>
<p
class="m_-3760638066444155266x_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_-3760638066444155266x_yiv1110160614MsoNormal"><span
style="color:#1f497d">John Rowe</span></p>
<p
class="m_-3760638066444155266x_yiv1110160614MsoNormal"><span
style="color:#1f497d">Qld</span></p>
<p
class="m_-3760638066444155266x_yiv1110160614MsoNormal"><span
style="color:#1f497d">Australia</span></p>
<p
class="m_-3760638066444155266x_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_-3760638066444155266x_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_-3760638066444155266x_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_-3760638066444155266x_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_-3760638066444155266x_yiv1110160614MsoNormal">Â </p>
<p
class="m_-3760638066444155266x_yiv1110160614MsoNormal"><span
lang="EN-GB">The car is a MkII
BT7.</span></p>
<p
class="m_-3760638066444155266x_yiv1110160614MsoNormal"><span
lang="EN-GB">The BMC manual says
adjust the clearances, cold, to
0.012â??.</span></p>
<p
class="m_-3760638066444155266x_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_-3760638066444155266x_yiv1110160614MsoNormal"><span
lang="EN-GB">The rolling road guy
said 0.016â??, warm.</span></p>
<p
class="m_-3760638066444155266x_yiv1110160614MsoNormal"><span
lang="EN-GB">Â </span></p>
<p
class="m_-3760638066444155266x_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_-3760638066444155266x_yiv1110160614MsoNormal"><span
lang="EN-GB">Stick with 0.015â??,
cold?</span></p>
<p
class="m_-3760638066444155266x_yiv1110160614MsoNormal"><span
lang="EN-GB">Â </span></p>
<p
class="m_-3760638066444155266x_yiv1110160614MsoNormal"><span
lang="EN-GB">Thanks,</span></p>
<p
class="m_-3760638066444155266x_yiv1110160614MsoNormal"><span
lang="EN-GB">Simon</span></p>
</div>
<br>
</div>
</div>
</div>
</div>
</div>
</div>
<div
id="m_-3760638066444155266x_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2">
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<pre class="m_-3760638066444155266moz-signature" cols="72">--
Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My World
go here: <a class="m_-3760638066444155266moz-txt-link-abbreviated"
href="http://WWW.PORTERBIKES.COM/"; target="_blank" rel="noreferrer"
moz-do-not-send="true">WWW.PORTERBIKES.COM/</a></pre>
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