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I read somewhere--wish I could find the article--that later cams
and, I think, the DWM cams have an extra tooth or two to reduce
overall wear on the pump drive. The gear pumps create less
resistance at higher RPMs so better for racing (something tells me
they might be cheaper to produce, too). DWM only recommends the
gear type for regular over 6K RPM use.<br>
<br>
It's been a while but, IIRC, I discussed this with the tech guys at
DWM and they assured me it is not an issue with the HC pumps
anymore, plus their cams are gun-drilled so more internal oil
'leaks.'<br>
<br>
<br>
<div class="moz-cite-prefix">On 12/30/2019 11:19 AM, Michael Salter
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAB3i7L+z-T+z7iL3ykNbkGvt4DddaaWAj+rq5=z34mmf2HtPkw@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div class="gmail_default" style="font-family:comic sans
ms,sans-serif;font-size:small">
<span style="color:rgb(0,0,255)"><i><span
style="font-size:11pt;font-family:"Calibri",sans-serif">"(All
of which begs the question as to why BMC switched from
one to t’other!)"</span></i></span></div>
<div class="gmail_default" style="font-family:comic sans
ms,sans-serif;font-size:small"><span
style="color:rgb(0,0,255)"><span
style="font-size:11pt;font-family:"Calibri",sans-serif"><font
color="#000000">I recall reading in a TSB that the
change was made because it was found that the "rotor"
pump was causing cam gear failures... </font><br>
</span></span></div>
<div class="gmail_default" style="font-family:comic sans
ms,sans-serif;font-size:small"><span
style="color:rgb(0,0,255)"><span
style="font-size:11pt;font-family:"Calibri",sans-serif"><br>
</span></span></div>
<div class="gmail_default" style="font-family:comic sans
ms,sans-serif;font-size:small"><span
style="color:rgb(0,0,255)"><span
style="font-size:11pt;font-family:"Calibri",sans-serif"><span
style="color:rgb(0,0,0)">M</span><br>
</span></span></div>
<div class="gmail_default" style="font-family:comic sans
ms,sans-serif;font-size:small"><span
style="color:rgb(0,0,255)"><i><span
style="font-size:11pt;font-family:"Calibri",sans-serif"></span></i></span>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Dec 30, 2019 at 2:05
PM <<a href="mailto:simon.lachlan@alexarevel.plus.com"
moz-do-not-send="true">simon.lachlan@alexarevel.plus.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div lang="EN-GB">
<div class="gmail-m_-1916944789079687300WordSection1">
<p class="MsoNormal"><span
style="font-size:11pt;font-family:"Calibri",sans-serif">Me
too. DW “High Capacity” type pump which is their
version of the older “rotor” type pump. It does a good
job.</span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:"Calibri",sans-serif">The
newer pumps are “Gear” type.</span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:"Calibri",sans-serif">I
gathered, from people who know about these things,
that the High Capacity is best all round and the Rotor
only comes into its own at high revs.</span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:"Calibri",sans-serif">(All
of which begs the question as to why BMC switched from
one to t’other!)</span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:"Calibri",sans-serif">As
to County, don’t know if they’ve attempted an oil
pump. Their water pump is an inferior item, for sure.
I studied Michaels’ blog on the topic and stripping
down both original types and one County absolutely
confirms what he says.</span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:"Calibri",sans-serif">Simon</span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:"Calibri",sans-serif"> </span></p>
<div>
<div style="border-color:rgb(225,225,225) currentcolor
currentcolor;border-style:solid none
none;border-width:1pt medium medium;padding:3pt 0cm
0cm">
<p class="MsoNormal"><b><span
style="font-size:11pt;font-family:"Calibri",sans-serif"
lang="EN-US">From:</span></b><span
style="font-size:11pt;font-family:"Calibri",sans-serif"
lang="EN-US"> Healeys <<a
href="mailto:healeys-bounces@autox.team.net"
target="_blank" moz-do-not-send="true">healeys-bounces@autox.team.net</a>>
<b>On Behalf Of </b>Bruce Steele<br>
<b>Sent:</b> 30 December 2019 16:53<br>
<b>To:</b> 'Michael Salter' <<a
href="mailto:michaelsalter@gmail.com"
target="_blank" moz-do-not-send="true">michaelsalter@gmail.com</a>>;
'Robert Begani' <<a
href="mailto:rfbegani@gmail.com" target="_blank"
moz-do-not-send="true">rfbegani@gmail.com</a>><br>
<b>Cc:</b> <a
href="mailto:healeys@autox.team.net"
target="_blank" moz-do-not-send="true">healeys@autox.team.net</a><br>
<b>Subject:</b> Re: [Healeys] Oil Pressure and
replacing the oil pump</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span
style="font-family:"Trebuchet
MS",sans-serif" lang="EN-US">I installed Denis
Welch push rods, along with the DWR-1 cam and hollow
lifters, when my engine was done. I also run a DWR
high capacity oil pump. I run around 40 pounds at
speed.</span></p>
<p class="MsoNormal"><span
style="font-family:"Trebuchet
MS",sans-serif" lang="EN-US"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Trebuchet
MS",sans-serif;color:rgb(31,73,125)" lang="EN-US">Bruce
Steele</span></p>
<p class="MsoNormal"><span
style="font-family:"Trebuchet
MS",sans-serif;color:rgb(31,73,125)" lang="EN-US">Brea,
CA</span></p>
<p class="MsoNormal"><span
style="font-family:"Trebuchet
MS",sans-serif;color:rgb(31,73,125)" lang="EN-US">1960
BN7</span></p>
<p class="MsoNormal"><span
style="font-family:"Trebuchet
MS",sans-serif" lang="EN-US"> </span></p>
<p class="MsoNormal"><b><span
style="font-size:11pt;font-family:"Calibri",sans-serif"
lang="EN-US">From:</span></b><span
style="font-size:11pt;font-family:"Calibri",sans-serif"
lang="EN-US"> Healeys [<a
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>Michael Salter<br>
<b>Sent:</b> Monday, December 30, 2019 6:20 AM<br>
<b>To:</b> Robert Begani <<a
href="mailto:rfbegani@gmail.com" target="_blank"
moz-do-not-send="true">rfbegani@gmail.com</a>><br>
<b>Cc:</b> <a href="mailto:healeys@autox.team.net"
target="_blank" moz-do-not-send="true">healeys@autox.team.net</a><br>
<b>Subject:</b> Re: [Healeys] Oil Pressure and
replacing the oil pump</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<div>
<div>
<p class="MsoNormal"><span lang="EN-US">Hi Robert, you
are the second person that I have heard of who had
that problem with "cheapo repo" push rods.</span></p>
<div>
<p class="MsoNormal"><span lang="EN-US">It seems
that those that are currently available are
produced with too small a diameter of the cup so
they seize on the rocker ball and break off.</span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-US">I would
recommend that you inspect all the rocker ball
ends carefully then install a set of good used
push rods to prevent further problems. </span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-US">M</span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-US">BTW
depending upon who supplied the bad parts you
may be able to recover the costs involved.</span></p>
</div>
<p class="MsoNormal" style="margin-bottom:12pt"><span
lang="EN-US"> </span></p>
<div>
<div>
<p class="MsoNormal"><span lang="EN-US">On Mon,
Dec 30, 2019, 12:55 AM Robert Begani, <<a
href="mailto:rfbegani@gmail.com"
target="_blank" moz-do-not-send="true">rfbegani@gmail.com</a>>
wrote:</span></p>
</div>
<blockquote style="border-color:currentcolor
currentcolor currentcolor
rgb(204,204,204);border-style:none none none
solid;border-width:medium medium medium
1pt;padding:0cm 0cm 0cm 6pt;margin:5pt 0cm 5pt
4.8pt">
<div>
<div>
<p class="MsoNormal"><span
style="font-family:"Arial",sans-serif"
lang="EN-US">When I rebuilt the engine
last year I did not replace the oil pump
because I had good oil pressure.
Currently, from time to time, while
breaking in the engine I am driving the
car round trip 20-30 miles down the
Tamiami Trail which is an open road for
that stretch.. On a recent trip, the
weather was cool, so the oil pressure was
running 35 to 40 psi while the engine
temperature was going up to 180 at 3000
rpm. At 4000 rpm the temperature climbed
over 180 degrees and the oil pressure
dropped below 30 psi. . I am considering
replacing the oil pump and remember that
there is a discussion about the quality of
Moss pumps. Maybe I should buy the
rebuild kit and change gears?</span><span
lang="EN-US"></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial",sans-serif"
lang="EN-US"> </span><span lang="EN-US"></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial",sans-serif"
lang="EN-US">Oh by the way, on the last
run all hell broke loose and had the car
towed home. Seems the mushroom on top of
one of the push rods broke. So I am
replacing all 12 of them.</span><span
lang="EN-US"></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial",sans-serif"
lang="EN-US"> </span><span lang="EN-US"></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial",sans-serif"
lang="EN-US">Regards,</span><span
lang="EN-US"></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial",sans-serif"
lang="EN-US"> </span><span lang="EN-US"></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial",sans-serif"
lang="EN-US">Bob Begani</span><span
lang="EN-US"></span></p>
</div>
</div>
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