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OK, that makes sense.<br>
<br>
<div class="moz-cite-prefix">On 1/1/2020 5:51 PM, WILLIAM B LAWRENCE
wrote:<br>
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If you look at their construction the rotary pumps have four
lobes that pump a large slug of oil for each cycle with each
slug causing a load on the drive train. The gear pump has
multiples of the number of lobes, but they are all smaller and
so the load that each slug imposes is less. The total mass of
oil pumped during a revolution will be approximately the same as
a rotary and the total power needed to pump that volume may be
close to the same, but the average stress load will be less due
to the smaller slugs being supplied.</div>
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<div style="font-family: Calibri, Helvetica, sans-serif;
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Bill Lawrence</div>
<div style="font-family: Calibri, Helvetica, sans-serif;
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BN1 #554</div>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
face="Calibri, sans-serif" color="#000000"><b>From:</b>
Healeys <a class="moz-txt-link-rfc2396E" href="mailto:healeys-bounces@autox.team.net"><healeys-bounces@autox.team.net></a> on behalf of
Bob Spidell <a class="moz-txt-link-rfc2396E" href="mailto:bspidell@comcast.net"><bspidell@comcast.net></a><br>
<b>Sent:</b> Thursday, January 2, 2020 12:33 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:healeys@autox.team.net">healeys@autox.team.net</a>
<a class="moz-txt-link-rfc2396E" href="mailto:healeys@autox.team.net"><healeys@autox.team.net></a><br>
<b>Subject:</b> Re: [Healeys] Oil Pumps</font>
<div> </div>
</div>
<div class="BodyFragment"><font size="2"><span
style="font-size:11pt;">
<div class="PlainText">I'm gonna make a SWAG that racers
routinely run at 6K RPM or more. I
<br>
rarely go over 3,500 RPM in my BJ8, with 3.54 diff, and
the 100s are <br>
known to break crankshafts if driven at 4K for long.
Either the gear <br>
pumps run at reduced pressure at lower RPMs or the pulsed
output of the <br>
vane-type is causing the problems.<br>
<br>
The DWM tech/sales people recommended the HC pump to me,
and I asked <br>
about their suitability; hence my questions about the
company. From <br>
their glossy catalog:<br>
<br>
"We recommend the high capacity for all road engines using
a standard <br>
type crank up to 6000 rpm and the standard pump for race
engines, steel <br>
cranks or anything over 6000 rpm."<br>
<br>
<br>
On 1/1/2020 3:43 PM, richard mayor wrote:<br>
> We racers have known about the dangers of using the
rotor style pumps <br>
> for decades. I personally know more than half a dozen
racers who <br>
> destroyed their camshafts using high volume oil pumps
back in the 90s <br>
> - including me. I lost two camshafts! Jeff Johnk
built a test bed, <br>
> did extensive testing of more than 50 hours on both
style pumps, and <br>
> wrote an exhaustive article that appeared in the May,
1998, issue of <br>
> Chatter, entitled Pumped Up For Racing.<br>
> I suggest than anyone who is thinking about using a
rotor style pump <br>
> read this article first.<br>
> Think about this for a minute. The rotor style pump
caused problems in <br>
> the 2.6 liter 100/6 motors. Austin changed to a gear
style pump a <br>
> month or so into the production of the 2.9 liter 3000
motors and the <br>
> problems went away. Why would anyone want to use a
100/6 oil pump?<br>
><br>
<br>
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