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Well, then explain to me why a Bugeye I had back in the 70s would read 60 =
PSI at speed when the proper amount of oil was in the engine.=C2=A0 At one =
quart low, it would read 40 PSI at speed.=C2=A0 Put in a quart and the pres=
sure would go right back up to 60 PSI.=C2=A0 It amounted to a rolling oil c=
hange with intermittent filter changes.Mike MacLean
On Wednesday, January 1, 2020, 11:24:06 AM PST, WILLIAM B LAWRENCE <yno=
tink@msn.com> wrote: =20
=20
#yiv5245057248 P {margin-top:0;margin-bottom:0;}Oil pumps, vane, rotary an=
d gear type are all positive displacement devices, meaning that they will c=
ontinue to build pressure against resistance to the point where something b=
reaks. That is why they are all equipped with a bypass valve which limits t=
he amount of pressure in the system. The amount of stress on the geardtrain=
is directly proportional to the pressure developed. I'm not sure if the pr=
oblems related to the rotary type pumps is a result of the stress of drivin=
g the pump or to the larger pressure pulses (vibration) that are inherent i=
n the design.=C2=A0
The manufacturer selects the bypass valve and spring assembly that will kee=
p the pressure within a safe range while protecting the drive system from o=
ver stress. The four cylinder engines are supposed to run at a maximum of 5=
0-55 PSI, the sixes somewhat lower, and it is the bypass valve that maintai=
ns that pressure even though the pump itself is capable of much higher pres=
sures if it encounters excessive resistance.=C2=A0
Viscosity change in the oil when at higher temperatures will reduce pressur=
e by reducing the resistance of the oil circulating through the various cle=
arances in the engine. As the engine wears these clearances will increase t=
hus reducing resistance and dropping oil pressure. Oil pressure alone is no=
t as important as is a constant flow of oil to all components combined with=
the film strength of a good quality oil.=C2=A0
Bill LawrenceBN1 #554From: Healeys <healeys-bounces@autox.team.net> on beha=
lf of Kees Oudesluijs <coudesluijs@chello.nl>
Sent: Wednesday, January 1, 2020 6:37 PM
To: healeys@autox.team.net <healeys@autox.team.net>
Subject: Re: [Healeys] Oil Pumps=C2=A0Absolutely correct. There may be theo=
retically a tiny difference,
immeasurable probably, caused by the efficiency of the various pumps.
Kees Oudesluijs
Op 1-1-2020 om 19:24 schreef Bob Spidell:
>
> I'm not a fluid dynamicist, but wouldn't, say, 45psi from either a=20
> vane/rotor type pump put the same load on the cam gear and driveshaft=20
> as 45psi from a gear-type pump, all other factors--oil viscosity,=20
> etc.--being equal?=C2=A0 Or, is there some other factor(s) at play?=C2=A0=
Do the=20
> gear-type pumps produce lower pressure (seems to me that's the only=20
> way they'd reduce the load on the gears and the cam thrust plate)?
>
> Bob
_______________________________________________
Archive: http://www.team.net/pipermail/healeyshttp://autox.team.net/archive
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Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archiv=
e
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
r.mike@att.net
=20
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<html><head></head><body><div class=3D"ydpa1f577edyahoo-style-wrap" style=
=3D"font-family:times new roman, new york, times, serif;font-size:16px;"><d=
iv></div>
<div dir=3D"ltr" data-setdir=3D"false">Well, then explain to me why=
a Bugeye I had back in the 70s would read 60 PSI at speed when the proper =
amount of oil was in the engine. At one quart low, it would read 40 P=
SI at speed. Put in a quart and the pressure would go right back up t=
o 60 PSI. It amounted to a rolling oil change with intermittent filte=
r changes.</div><div dir=3D"ltr" data-setdir=3D"false">Mike MacLean<br></di=
v><div><br></div>
=20
</div><div id=3D"yahoo_quoted_8527093733" class=3D"yahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div>
On Wednesday, January 1, 2020, 11:24:06 AM PST, WILLIAM=
B LAWRENCE <ynotink@msn.com> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id=3D"yiv5245057248"><style type=3D"text/css">#yi=
v5245057248 P {margin-top:0;margin-bottom:0;}</style><div dir=3D"ltr">
<div style=3D"font-family:Calibri, Helvetica, sans-serif;font-size:12pt;col=
or:rgb(0, 0, 0);">
Oil pumps, vane, rotary and gear type are all positive displacement devices=
, meaning that they will continue to build pressure against resistance to t=
he point where something breaks. That is why they are all equipped with a b=
ypass valve which limits the amount
of pressure in the system. The amount of stress on the geardtrain is direc=
tly proportional to the pressure developed. I'm not sure if the problems re=
lated to the rotary type pumps is a result of the stress of driving the pum=
p or to the larger pressure pulses
(vibration) that are inherent in the design. </div>
<div style=3D"font-family:Calibri, Helvetica, sans-serif;font-size:12pt;col=
or:rgb(0, 0, 0);">
<br clear=3D"none">
</div>
<div style=3D"font-family:Calibri, Helvetica, sans-serif;font-size:12pt;col=
or:rgb(0, 0, 0);">
The manufacturer selects the bypass valve and spring assembly that will kee=
p the pressure within a safe range while protecting the drive system from o=
ver stress. The four cylinder engines are supposed to run at a maximum of 5=
0-55 PSI, the sixes somewhat lower,
and it is the bypass valve that maintains that pressure even though the pu=
mp itself is capable of much higher pressures if it encounters excessive re=
sistance. </div>
<div style=3D"font-family:Calibri, Helvetica, sans-serif;font-size:12pt;col=
or:rgb(0, 0, 0);">
<br clear=3D"none">
</div>
<div style=3D"font-family:Calibri, Helvetica, sans-serif;font-size:12pt;col=
or:rgb(0, 0, 0);">
Viscosity change in the oil when at higher temperatures will reduce pressur=
e by reducing the resistance of the oil circulating through the various cle=
arances in the engine. As the engine wears these clearances will increase t=
hus reducing resistance and dropping
oil pressure. Oil pressure alone is not as important as is a constant flow=
of oil to all components combined with the film strength of a good quality=
oil. </div>
<div style=3D"font-family:Calibri, Helvetica, sans-serif;font-size:12pt;col=
or:rgb(0, 0, 0);">
<br clear=3D"none">
</div>
<div style=3D"font-family:Calibri, Helvetica, sans-serif;font-size:12pt;col=
or:rgb(0, 0, 0);">
Bill Lawrence</div>
<div style=3D"font-family:Calibri, Helvetica, sans-serif;font-size:12pt;col=
or:rgb(0, 0, 0);">
BN1 #554</div>
<div id=3D"yiv5245057248appendonsend"></div>
<hr style=3D"display:inline-block;width:98%;" tabindex=3D"-1">
<div class=3D"yiv5245057248yqt6284778669" id=3D"yiv5245057248yqtfd48332"><d=
iv dir=3D"ltr" id=3D"yiv5245057248divRplyFwdMsg"><font style=3D"font-size:1=
1pt;" face=3D"Calibri, sans-serif" color=3D"#000000"><b>From:</b> Healeys &=
lt;healeys-bounces@autox.team.net> on behalf of Kees Oudesluijs <coud=
esluijs@chello.nl><br clear=3D"none">
<b>Sent:</b> Wednesday, January 1, 2020 6:37 PM<br clear=3D"none">
<b>To:</b> healeys@autox.team.net <healeys@autox.team.net><br clear=
=3D"none">
<b>Subject:</b> Re: [Healeys] Oil Pumps</font>
<div> </div>
</div>
</div><div class=3D"yiv5245057248BodyFragment"><div class=3D"yiv5245057248y=
qt6284778669" id=3D"yiv5245057248yqtfd30502"><font size=3D"2"><span style=
=3D"font-size:11pt;">
</span></font></div><div class=3D"yiv5245057248PlainText"><div class=3D"yiv=
5245057248yqt6284778669" id=3D"yiv5245057248yqtfd08562">Absolutely correct.=
There may be theoretically a tiny difference,
<br clear=3D"none">
immeasurable probably, caused by the efficiency of the various pumps.<br cl=
ear=3D"none">
<br clear=3D"none">
Kees Oudesluijs<br clear=3D"none">
<br clear=3D"none">
Op 1-1-2020 om 19:24 schreef Bob Spidell:<br clear=3D"none">
><br clear=3D"none">
> I'm not a fluid dynamicist, but wouldn't, say, 45psi from either a <br=
clear=3D"none">
> vane/rotor type pump put the same load on the cam gear and driveshaft =
<br clear=3D"none">
> as 45psi from a gear-type pump, all other factors--oil viscosity, <br =
clear=3D"none">
> etc.--being equal? Or, is there some other factor(s) at play?&nb=
sp; Do the <br clear=3D"none">
> gear-type pumps produce lower pressure (seems to me that's the only <b=
r clear=3D"none">
> way they'd reduce the load on the gears and the cam thrust plate)?<br =
clear=3D"none">
><br clear=3D"none">
> Bob<br clear=3D"none">
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