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Hi Richard,
Yes, I am running the DW rotary pump. And Penrite HPR 40 oil. I know the Pen=
rite HPR is a big chunk of the good oil pressure answer, from my testing of 4=
or 5 different oils over the past 18 years on this engine.=20
Happy to explain my experience of the oil pump differences, in probably more=
detail than required, but first can I ask you two questions?
1. How many teeth are on the camshaft oil pump gear drive, of the camshafts w=
here you had this failure? 12 or 13?
2. How hard did you rev these engines? Over 6,000rpm or not?
Best
Chris
> On 2 Sep 2016, at 11:30 AM, richard mayor <boyracer466@gmail.com> wrote:
>=20
> Chris,
>=20
> I hate to be negative about your good oil pressure but I fear you may have=
a problem. I am assuming that you have the "high pressure" oil pump from D=
W.
>=20
> Based upon that assumption, I can tell you that it is the rotary style of p=
ump that was used on the 100-6 engines. There were many problems with this p=
ump. It has a very large capacity and as such it results in a lot of fricti=
on, or back pressure in the system. Namely, it put stress on the camshaft ge=
ar, the driving spindle gear, the timing chain and the camshaft thrust plate=
. This was a common problem with the early 100-6 motors. One fix was to ma=
chine an oil grove in one side of the the trust plate. Then an oil groove on=
both sides. Then a bronze thrust plate with oil grooves. Timing chains str=
etched. Cam and driving spindle gears received excessive wear. That is why=
the switch was made to the gear style pump.
>=20
> The rotary style of pump is actually a very good design. Nissan used it in=
the Z car motors but it was 2/3rd the size of the Healey pump so there was m=
uch less back pressure. =20
>=20
> Many of us racers have used the DW "high pressure" oil pumps and discovere=
d that at some point, all of the teeth on the cam and driving spindles have b=
een ground off to such an extent that we have lost all oil pressure. On a s=
helf with my "offerings to the god of speed" I have a camshaft thrust plate t=
hat has a groove that has been ground into it almost 1/8th of an inch from t=
he resistance of the oil pump forcing the camshaft into the trust plate. I a=
m sad to admit that it took me the loss of 2 race motors to finally grasp wh=
y this was happening and before I switched back to the 3000 gear style pump .=
>=20
> Jeff Jonk did an excellent article about these pumps and the damage they c=
ause in the Healey Marque publication about 10 years ago.
>=20
> Richard
>=20
>> On Tue, Aug 30, 2016 at 3:53 AM, Chris Dimmock <austin.healey@gmail.com> w=
rote:
>> Hi all,
>> Recently someone asked about oil pressures, and the oil being used.
>>=20
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div>Hi Richard,</div><div>Yes, I am runnin=
g the DW rotary pump. And Penrite HPR 40 oil. I know the Penrite HPR is a bi=
g chunk of the good oil pressure answer, from my testing of 4 or 5 different=
oils over the past 18 years on this engine. </div><div>Happy to explai=
n my experience of the oil pump differences, in probably more detail than re=
quired, but first can I ask you two questions?</div><div>1. How many teeth a=
re on the camshaft oil pump gear drive, of the camshafts where you had this f=
ailure? 12 or 13?</div><div>2. How hard did you rev these engines? Over 6,00=
0rpm or not?</div><div>Best</div><div>Chris</div><div><br>On 2 Sep 2016, at 1=
1:30 AM, richard mayor <<a href=3D"mailto:boyracer466@gmail.com";>boyracer=
466@gmail.com</a>> wrote:<br><br></div><blockquote type=3D"cite"><div><di=
v dir=3D"ltr"><div><div><div>Chris,<br><br></div>I hate to be negative about=
your good oil pressure but I fear you may have a problem. I am assumi=
ng that you have the "high pressure" oil pump from DW.<br><br>Based upon tha=
t assumption, I can tell you that it is the rotary style of pump that was us=
ed on the 100-6 engines. There were many problems with this pump. It h=
as a very large capacity and as such it results in a lot of friction, or bac=
k pressure in the system. Namely, it put stress on the camshaft gear, the dr=
iving spindle gear, the timing chain and the camshaft thrust plate. Th=
is was a common problem with the early 100-6 motors. One fix was to ma=
chine an oil grove in one side of the the trust plate. Then an oil groove on=
both sides. Then a bronze thrust plate with oil grooves. Timing chain=
s stretched. Cam and driving spindle gears received excessive wear.&nb=
sp; That is why the switch was made to the gear style pump.<br><br>The rotar=
y style of pump is actually a very good design. Nissan used it in the Z car m=
otors but it was 2/3rd the size of the Healey pump so there was much less ba=
ck pressure. <br><br></div>Many of us racers have used the DW "high pr=
essure" oil pumps and discovered that at some point, all of the teeth on the=
cam and driving spindles have been ground off to such an extent that we hav=
e lost all oil pressure. On a shelf with my "offerings to the god of s=
peed" I have a camshaft thrust plate that has a groove that has been ground i=
nto it almost 1/8th of an inch from the resistance of the oil pump for=
cing the camshaft into the trust plate. I am sad to admit that it took me th=
e loss of 2 race motors to finally grasp why this was happening and before I=
switched back to the 3000 gear style pump .<br><br></div><div>Jeff Jonk did=
an excellent article about these pumps and the damage they cause in the Hea=
ley Marque publication about 10 years ago.<br><br></div><div></div>Richard<b=
r><div><div><br><div><div class=3D"gmail_extra"><div class=3D"gmail_quote">O=
n Tue, Aug 30, 2016 at 3:53 AM, Chris Dimmock <span dir=3D"ltr"><<a href=3D=
"mailto:austin.healey@gmail.com"; target=3D"_blank">austin.healey@gmail.com</=
a>></span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0=
0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi all,<br>
Recently someone asked about oil pressures, and the oil being used.<br><br><=
/blockquote></div></div></div></div></div></div></div></blockquote></body></=
html>=
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