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Valve clearances are not that critical. A smaller clearance will slightly
lengthen the duration of the cam, while a larger clearance will shorten the
duration. A larger clearance will also cause the valve opening to
accelerate more quickly, so, the valve train must be up to the stress.
I have run clearances all of the way from .006 to .020, depending on the cam
and the effect, which I want to accomplish.
When in doubt, set to the lash recommended by the cam manufacturer.
Regards,
Jim Hockert
From: Healeys <healeys-bounces@autox.team.net> On Behalf Of Bruce Steele
Sent: Saturday, January 12, 2019 1:25 PM
To: 'Bob Spidell' <bspidell@comcast.net>; healeys@autox.team.net
Subject: Re: [Healeys] Valve clearances
I'm also running the DWR-1 cam and was also instructed to set all clearances
at .015 cold.
Bruce Steele
Brea, CA
1960 BN7
From: Healeys [mailto:healeys-bounces@autox.team.net] On Behalf Of Bob
Spidell
Sent: Saturday, January 12, 2019 8:52 AM
Subject: Re: [Healeys] Valve clearances
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 (don'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
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 0.012".
Denis Welch said I should go 0.015", cold, after fitting their "Fast Road"
cam.
The rolling road guy said 0.016", 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 0.015", cold?
Thanks,
Simon
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lang=3DEN-US link=3D"#0563C1" vlink=3D"#954F72"><div =
class=3DWordSection1><p class=3DMsoNormal>Valve clearances are not that =
critical. A smaller clearance will slightly lengthen the duration =
of the cam, while a larger clearance will shorten the duration. A =
larger clearance will also cause the valve opening to accelerate more =
quickly, so, the valve train must be up to the stress.<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>I have run =
clearances all of the way from .006 to .020, depending on the cam and =
the effect, which I want to accomplish.<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>When in =
doubt, set to the lash recommended by the cam =
manufacturer.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>Regards,<o:p></o:p></p><p class=3DMsoNormal>Jim =
Hockert<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From:</b> Healeys =
<healeys-bounces@autox.team.net> <b>On Behalf Of </b>Bruce =
Steele<br><b>Sent:</b> Saturday, January 12, 2019 1:25 PM<br><b>To:</b> =
'Bob Spidell' <bspidell@comcast.net>; =
healeys@autox.team.net<br><b>Subject:</b> Re: [Healeys] Valve =
clearances<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Trebuchet =
MS",sans-serif'>I’m also running the DWR-1 cam and was also =
instructed to set all clearances at .015 cold.<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Trebuchet =
MS",sans-serif'><o:p> </o:p></span></p><div><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Trebuchet =
MS",sans-serif;color:#1F497D'>Bruce Steele<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Trebuchet =
MS",sans-serif;color:#1F497D'>Brea, CA<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Trebuchet =
MS",sans-serif;color:#1F497D'>1960 BN7<o:p></o:p></span></p></div><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Trebuchet =
MS",sans-serif'><o:p> </o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From:</b> Healeys [<a =
href=3D"mailto:healeys-bounces@autox.team.net";>mailto:healeys-bounces@aut=
ox.team.net</a>] <b>On Behalf Of </b>Bob Spidell<br><b>Sent:</b> =
Saturday, January 12, 2019 8:52 AM<br><b>To:</b> <a =
href=3D"mailto:healeys@autox.team.net";>healeys@autox.team.net</a><br><b>S=
ubject:</b> Re: [Healeys] Valve clearances<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><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.<span =
style=3D'font-size:12.0pt'><o:p></o:p></span></p><p>Bob<o:p></o:p></p><di=
v><p class=3DMsoNormal>On 1/11/2019 8:48 PM, John Rowe =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>Simon,</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Modified cams require =
the large clearance (don’t ask me why?) So go for .015 that is =
what mine is.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>John Rowe</span><o:p></o:p></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>Qld</span><o:p></o:p></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>Australia</span><o:p></o:p></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'> </span><o:p></o:p></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif'>From:</span></=
b><span style=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif'> =
Healeys [<a =
href=3D"mailto:healeys-bounces@autox.team.net";>mailto:healeys-bounces@aut=
ox.team.net</a>] <b>On Behalf Of </b><a =
href=3D"mailto:simon.lachlan@alexarevel.plus.com";>simon.lachlan@alexareve=
l.plus.com</a><br><b>Sent:</b> Saturday, 12 January 2019 9:14 =
AM<br><b>To:</b> Healeys<br><b>Subject:</b> [Healeys] Valve =
clearances</span><o:p></o:p></p></div></div><p =
class=3DMsoNormal> <o:p></o:p></p><p class=3DMsoNormal><span =
lang=3DEN-GB>The car is a MkII BT7.</span><o:p></o:p></p><p =
class=3DMsoNormal><span lang=3DEN-GB>The BMC manual says adjust the =
clearances, cold, to 0.012”.</span><o:p></o:p></p><p =
class=3DMsoNormal><span lang=3DEN-GB>Denis Welch said I should go =
0.015”, cold, after fitting their “Fast Road” =
cam.</span><o:p></o:p></p><p class=3DMsoNormal><span lang=3DEN-GB>The =
rolling road guy said 0.016”, warm.</span><o:p></o:p></p><p =
class=3DMsoNormal><span lang=3DEN-GB> </span><o:p></o:p></p><p =
class=3DMsoNormal><span lang=3DEN-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><o:p></o:p></p><p class=3DMsoNormal><span =
lang=3DEN-GB>Stick with 0.015”, cold?</span><o:p></o:p></p><p =
class=3DMsoNormal><span lang=3DEN-GB> </span><o:p></o:p></p><p =
class=3DMsoNormal><span lang=3DEN-GB>Thanks,</span><o:p></o:p></p><p =
class=3DMsoNormal><span lang=3DEN-GB>Simon</span><o:p></o:p></p><p =
class=3DMsoNormal style=3D'margin-bottom:12.0pt'><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman",serif'><o:p> </o:p></span></p><pre><o:p> </o:p></pre></b=
lockquote></div></body></html>
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