<div dir="ltr"><div>DW used to advertise that the rotary style pump was good to 6000 RPM but higher reving engines should use the gear style. <br><br>All I can say is .... don't you believe it!!!!<br><br></div>My question to you is why would you want to use a component from a 100-6 engine that has caused so many problems? No one ever lost an engine because of the gear style pump.<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Sep 2, 2016 at 4:46 AM, Bob Spidell <span dir="ltr"><<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<p>Richard,</p>
<p>DW sells the rotary pump specifically for engines that mostly run
at relatively low revs (i.e. street/touring cars); and the gear
pump for engines that run at higher revs (i.e. racers). DP you
think the gear pump can be a problem in engines that rarely run
over, say, 4,000RPM? I can't believe the DW people aren't aware
of the backpressure issue.<br>
</p>
<p>I might be buying a new pump soon.<br>
</p>
<p>Bob<br>
</p>
<br>
<div>On 9/1/2016 6:30 PM, richard mayor
wrote:<br>
</div>
<blockquote type="cite">
<div dir="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 assuming that you have
the "high pressure" oil pump from DW.<br>
<br>
Based upon that assumption, I can tell you that it is the
rotary style of pump that was used on the 100-6 engines.
There were many problems with this pump. It has a very
large capacity and as such it results in a lot of friction,
or back pressure in the system. Namely, it put stress on the
camshaft gear, 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 machine 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 stretched. Cam and driving spindle gears
received excessive wear. That is why the switch was made to
the gear style pump.<br>
<br>
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 much less back pressure. <br>
<br>
</div>
Many of us racers have used the DW "high pressure" 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 have lost all oil pressure. On a shelf with my
"offerings to the god of speed" I have a camshaft thrust plate
that has a groove that has been ground into it almost 1/8th
of an inch from the resistance of the oil pump forcing the
camshaft into the trust plate. I am sad to admit that it took
me the 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 Healey Marque publication about
10 years ago.<br>
<br>
</div>
Richard<br>
<div>
<div><br>
<div>
<div class="gmail_extra">
<div class="gmail_quote">On Tue, Aug 30, 2016 at 3:53
AM, Chris Dimmock <span dir="ltr"><<a href="mailto:austin.healey@gmail.com" target="_blank">austin.healey@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="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>
My BJ8 engine was totally rebuilt in 1998.<br>
Today, my wife and I went for a drive up the M1
motorway and I kept an eye on oil pressure. Water
temp was 185 degrees all the time. Air temp was ~22
degrees Celcius.<br>
Lovely day for a drive to the Hunter Valley!<br>
<br>
Hot idle. After 70 minutes at ~70 mph, idle @ 850 -
900rpm = 40 lbs.<br>
Oil pressure at 2,000 rpm hot driving = 50 lbs<br>
3,000 - 5,000 rpm hot oil pressure = 60 lbs.<br>
My wife said we wouldn't make our 3rd wedding
anniversary if I pulled 6,000 in overdrive top.....
;-)<br>
Denis Welch oil pump.<br>
Fresh Penrite HPR 40 oil and filter last weekend.<br>
Draw your own conclusions. Mine are:<br>
the thermostat is perfect, and<br>
so is the oil pressure relief valve.<br>
Best<br>
Chris</blockquote>
</div>
</div>
</div>
</div>
</div>
</div>
<pre></pre>
</blockquote>
<br>
</div>
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