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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.
Happy New Year to all.... Harold
_____
From: Healeys [mailto:healeys-bounces@autox.team.net] On Behalf Of Bob
Spidell
Sent: Wednesday, January 01, 2020 6:56 PM
To: WILLIAM B LAWRENCE; healeys@autox.team.net
Subject: Re: [Healeys] Oil Pumps
OK, that makes sense.
On 1/1/2020 5:51 PM, WILLIAM B LAWRENCE wrote:
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.
Bill Lawrence
BN1 #554
_____
<healeys-bounces@autox.team.net> on behalf of Bob Spidell
Sent: Thursday, January 2, 2020 12:33 AM
<healeys@autox.team.net>
Subject: Re: [Healeys] Oil Pumps
I'm gonna make a SWAG that racers routinely run at 6K RPM or more. I
rarely go over 3,500 RPM in my BJ8, with 3.54 diff, and the 100s are
known to break crankshafts if driven at 4K for long. Either the gear
pumps run at reduced pressure at lower RPMs or the pulsed output of the
vane-type is causing the problems.
The DWM tech/sales people recommended the HC pump to me, and I asked
about their suitability; hence my questions about the company. From
their glossy catalog:
"We recommend the high capacity for all road engines using a standard
type crank up to 6000 rpm and the standard pump for race engines, steel
cranks or anything over 6000 rpm."
On 1/1/2020 3:43 PM, richard mayor wrote:
> We racers have known about the dangers of using the rotor style pumps
> for decades. I personally know more than half a dozen racers who
> destroyed their camshafts using high volume oil pumps back in the 90s
> - including me. I lost two camshafts! Jeff Johnk built a test bed,
> did extensive testing of more than 50 hours on both style pumps, and
> wrote an exhaustive article that appeared in the May, 1998, issue of
> Chatter, entitled Pumped Up For Racing.
> I suggest than anyone who is thinking about using a rotor style pump
> read this article first.
> Think about this for a minute. The rotor style pump caused problems in
> the 2.6 liter 100/6 motors. Austin changed to a gear style pump a
> month or so into the production of the 2.9 liter 3000 motors and the
> problems went away. Why would anyone want to use a 100/6 oil pump?
>
_______________________________________________
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<BODY text=3D#000000 bgColor=3D#ffffff>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D526021419-02012020><FONT =
color=3D#0000ff=20
size=3D2 face=3DArial>Lets not forget the pressure relief spring, =
accuracy of a 50=20
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=3Dltr align=3Dleft><SPAN class=3D526021419-02012020><FONT =
color=3D#0000ff=20
size=3D2 face=3DArial></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D526021419-02012020><FONT =
color=3D#0000ff=20
size=3D2 face=3DArial>Happy New Year to all.... =
Harold</FONT></SPAN></DIV><BR>
<DIV lang=3Den-us class=3DOutlookMessageHeader dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT size=3D2 face=3DTahoma><B>From:</B> Healeys=20
[mailto:healeys-bounces@autox.team.net] <B>On Behalf Of </B>Bob=20
Spidell<BR><B>Sent:</B> Wednesday, January 01, 2020 6:56 =
PM<BR><B>To:</B>=20
WILLIAM B LAWRENCE; healeys@autox.team.net<BR><B>Subject:</B> Re: =
[Healeys] Oil=20
Pumps<BR></FONT><BR></DIV>
<DIV></DIV>OK, that makes sense.<BR><BR>
<DIV class=3Dmoz-cite-prefix>On 1/1/2020 5:51 PM, WILLIAM B LAWRENCE=20
wrote:<BR></DIV>
<BLOCKQUOTE=20
cite=3Dmid:CY4PR07MB3432A1B2E03EDB48A87BE33DA5200@CY4PR07MB3432.namprd07.=
prod.outlook.com=20
type=3D"cite">
<STYLE style=3D"DISPLAY: none" type=3Dtext/css>P {
MARGIN-BOTTOM: 0px; MARGIN-TOP: 0px
}
</STYLE>
<DIV=20
style=3D"FONT-SIZE: 12pt; FONT-FAMILY: Calibri, Helvetica, sans-serif; =
COLOR: rgb(0,0,0)">If=20
you look at their construction the rotary pumps have four lobes that =
pump a=20
large slug of oil for each cycle with each slug causing a load on the =
drive=20
train. The gear pump has multiples of the number of lobes, but they =
are all=20
smaller and so the load that each slug imposes is less. The total mass =
of oil=20
pumped during a revolution will be approximately the same as a rotary =
and the=20
total power needed to pump that volume may be close to the same, but =
the=20
average stress load will be less due to the smaller slugs being=20
supplied.</DIV>
<DIV=20
style=3D"FONT-SIZE: 12pt; FONT-FAMILY: Calibri, Helvetica, sans-serif; =
COLOR: rgb(0,0,0)"><BR></DIV>
<DIV=20
style=3D"FONT-SIZE: 12pt; FONT-FAMILY: Calibri, Helvetica, sans-serif; =
COLOR: rgb(0,0,0)">Bill=20
Lawrence</DIV>
<DIV=20
style=3D"FONT-SIZE: 12pt; FONT-FAMILY: Calibri, Helvetica, sans-serif; =
COLOR: rgb(0,0,0)">BN1=20
#554</DIV>
<HR tabIndex=3D-1 style=3D"WIDTH: 98%; DISPLAY: inline-block">
<DIV id=3DdivRplyFwdMsg dir=3Dltr><FONT style=3D"FONT-SIZE: 11pt" =
color=3D#000000=20
face=3D"Calibri, sans-serif"><B>From:</B> Healeys <A =
class=3Dmoz-txt-link-rfc2396E=20
=
href=3D"mailto:healeys-bounces@autox.team.net";><healeys-bounces@autox.=
team.net></A>=20
on behalf of Bob Spidell <A class=3Dmoz-txt-link-rfc2396E=20
=
href=3D"mailto:bspidell@comcast.net";><bspidell@comcast.net></A><BR>=
<B>Sent:</B>=20
Thursday, January 2, 2020 12:33 AM<BR><B>To:</B> <A=20
class=3Dmoz-txt-link-abbreviated=20
href=3D"mailto:healeys@autox.team.net";>healeys@autox.team.net</A> <A=20
class=3Dmoz-txt-link-rfc2396E=20
=
href=3D"mailto:healeys@autox.team.net";><healeys@autox.team.net></A>=
<BR><B>Subject:</B>=20
Re: [Healeys] Oil Pumps</FONT>=20
<DIV> </DIV></DIV>
<DIV class=3DBodyFragment><FONT size=3D2><SPAN style=3D"FONT-SIZE: =
11pt">
<DIV class=3DPlainText>I'm gonna make a SWAG that racers routinely run =
at 6K RPM=20
or more. I <BR>rarely go over 3,500 RPM in my BJ8, with 3.54 diff, and =
the=20
100s are <BR>known to break crankshafts if driven at 4K for =
long. =20
Either the gear <BR>pumps run at reduced pressure at lower RPMs or the =
pulsed=20
output of the <BR>vane-type is causing the problems.<BR><BR>The DWM =
tech/sales=20
people recommended the HC pump to me, and I asked <BR>about their =
suitability;=20
hence my questions about the company. From <BR>their glossy=20
catalog:<BR><BR>"We recommend the high capacity for all road engines =
using a=20
standard <BR>type crank up to 6000 rpm and the standard pump for race =
engines,=20
steel <BR>cranks or anything over 6000 rpm."<BR><BR><BR>On 1/1/2020 =
3:43 PM,=20
richard mayor wrote:<BR>> We racers have known about the dangers of =
using=20
the rotor style pumps <BR>> for decades. I personally know more =
than half a=20
dozen racers who <BR>> destroyed their camshafts using high volume =
oil=20
pumps back in the 90s <BR>> - including me. I lost two =
camshafts! =20
Jeff Johnk built a test bed, <BR>> did extensive testing of more =
than 50=20
hours on both style pumps, and <BR>> wrote an exhaustive article =
that=20
appeared in the May, 1998, issue of <BR>> Chatter, entitled Pumped =
Up For=20
Racing.<BR>> I suggest than anyone who is thinking about using a =
rotor=20
style pump <BR>> read this article first.<BR>> Think about this =
for a=20
minute. The rotor style pump caused problems in <BR>> the 2.6 liter =
100/6=20
motors. Austin changed to a gear style pump a <BR>> month or so =
into the=20
production of the 2.9 liter 3000 motors and the <BR>> problems went =
away.=20
Why would anyone want to use a 100/6 oil=20
=
pump?<BR>><BR><BR>_______________________________________________<BR>S=
upport=20
Team.Net <A href=3D"http://www.team.net/donate.html"=20
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moz-do-not-send=3D"true">http://www.team.net/donate.html</A><BR>Suggested=
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donation $12.75<BR><BR>Archive: <A=20
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