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<DIV dir=ltr align=left><SPAN class=526021419-02012020><FONT color=#0000ff
size=2 face=Arial>Lets not forget the pressure relief spring, accuracy of a 50
year old Healey oil pressure gauge, type of oil, engine RPM, etc are all
variables affecting the oil pressure reading.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=526021419-02012020><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=526021419-02012020><FONT color=#0000ff
size=2 face=Arial>Happy New Year to all.... Harold</FONT></SPAN></DIV><BR>
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<FONT size=2 face=Tahoma><B>From:</B> Healeys
[mailto:healeys-bounces@autox.team.net] <B>On Behalf Of </B>Bob
Spidell<BR><B>Sent:</B> Wednesday, January 01, 2020 6:56 PM<BR><B>To:</B>
WILLIAM B LAWRENCE; healeys@autox.team.net<BR><B>Subject:</B> Re: [Healeys] Oil
Pumps<BR></FONT><BR></DIV>
<DIV></DIV>OK, that makes sense.<BR><BR>
<DIV class=moz-cite-prefix>On 1/1/2020 5:51 PM, WILLIAM B LAWRENCE
wrote:<BR></DIV>
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<DIV
style="FONT-SIZE: 12pt; FONT-FAMILY: Calibri, Helvetica, sans-serif; COLOR: rgb(0,0,0)">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>
<DIV
style="FONT-SIZE: 12pt; FONT-FAMILY: Calibri, Helvetica, sans-serif; COLOR: rgb(0,0,0)"><BR></DIV>
<DIV
style="FONT-SIZE: 12pt; FONT-FAMILY: Calibri, Helvetica, sans-serif; COLOR: rgb(0,0,0)">Bill
Lawrence</DIV>
<DIV
style="FONT-SIZE: 12pt; FONT-FAMILY: Calibri, Helvetica, sans-serif; COLOR: rgb(0,0,0)">BN1
#554</DIV>
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<DIV id=divRplyFwdMsg dir=ltr><FONT style="FONT-SIZE: 11pt" color=#000000
face="Calibri, sans-serif"><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>_______________________________________________<BR>Support
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