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Ok, guys lets not get carried away. Firstly my 3000 MK1 was originally
fitted with the rotary pump, so how is it a 100/6 pump that was quickly
discontinued? Why does it seems every current Healey owner seem to think
they need to use race engine principals in a car that most likely they
will just take out for a cruise and coffee? I respect Jeff Johnk for his
efforts with race engines and met him a few years ago in Australia. Nice
guy. I did work with Dave Woodhouse and Max Cooper quite a lot during
the development of the DMD alloy engine! Firstly there were problems
with the race camshaft oil pump drive gears that were made in Queensland
and sold by DMD in the early days. However that is probably not the
whole problem. Yes the rotary pump produces more oil, so due to spring
gain in the relief valve it will produce more oil pressure using a
standard spring. Dave Woodhouse at DMD suggested and supplied me with a
new old stock set of rotary gears for my BT7 pump as the best option for
my road engine as I would get better oil pressure in that engine. The
age old standard is that your engine should supply 10 PSI oil pressure
per 1000 RPM, so that was fine by me. Yes lubrication to the drive gear
on the cam is no where as good as it is in the Healey 100 engine, but I
doubt it is an issue to any owner that has a road car. If you look at
the two designs the spur gear pump was cheaper to produce, but suffer
much more wear than the rotary pumps, so from Austin's perspective why
use the more expensive pump when the Healey end was telling you they
caused problems at sustained high RPM. So go your own way and enjoy it :)
Regards
Larry Varley
On 3/01/2020 4:24 AM, richard mayor wrote:
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<p>Ok, guys lets not get carried away. Firstly my 3000 MK1 was
originally fitted with the rotary pump, so how is it a 100/6 pump
that was quickly discontinued? Why does it seems every current
Healey owner seem to think they need to use race engine principals
in a car that most likely they will just take out for a cruise and
coffee? I respect Jeff Johnk for his efforts with race engines and
met him a few years ago in Australia. Nice guy. I did work with
Dave Woodhouse and Max Cooper quite a lot during the development
of the DMD alloy engine! Firstly there were problems with the race
camshaft oil pump drive gears that were made in Queensland and
sold by DMD in the early days. However that is probably not the
whole problem. Yes the rotary pump produces more oil, so due to
spring gain in the relief valve it will produce more oil pressure
using a standard spring. Dave Woodhouse at DMD suggested and
supplied me with a new old stock set of rotary gears for my BT7
pump as the best option for my road engine as I would get better
oil pressure in that engine. The age old standard is that your
engine should supply 10 PSI oil pressure per 1000 RPM, so that was
fine by me. Yes lubrication to the drive gear on the cam is no
where as good as it is in the Healey 100 engine, but I doubt it is
an issue to any owner that has a road car. If you look at the two
designs the spur gear pump was cheaper to produce, but suffer much
more wear than the rotary pumps, so from Austin's perspective why
use the more expensive pump when the Healey end was telling you
they caused problems at sustained high RPM. So go your own way and
enjoy it :)</p>
<p>Regards</p>
<p>Larry Varley<br>
</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 3/01/2020 4:24 AM, richard mayor
wrote:<br>
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<pre wrap="">_______________________________________________
Archive: <a class="moz-txt-link-freetext"
href="http://www.team.net/pipermail/healeys";>http://www.team.net/pipermail/healeys</a>
<a class="moz-txt-link-freetext"
href="http://autox.team.net/archive";>http://autox.team.net/archive</a>
<a class="moz-txt-link-abbreviated"
href="mailto:Healeys@autox.team.net";>Healeys@autox.team.net</a>
<a class="moz-txt-link-freetext"
href="http://autox.team.net/mailman/listinfo/healeys";>http://autox.team.net/mailman/listinfo/healeys</a>
</pre>
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