[Healeys] Oil Pressure and replacing the oil pump

Mon Dec 30 16:40:49 MST 2019

I read somewhere--wish I could find the article--that later cams and, I 
think, the DWM cams have an extra tooth or two to reduce overall wear on 
the pump drive.  The gear pumps create less resistance at higher RPMs so 
better for racing (something tells me they might be cheaper to produce, 
too).  DWM only recommends the gear type for regular over 6K RPM use.

It's been a while but, IIRC, I discussed this with the tech guys at DWM 
and they assured me it is not an issue with the HC pumps anymore, plus 
their cams are gun-drilled so more internal oil 'leaks.'

On 12/30/2019 11:19 AM, Michael Salter wrote:
> /"(All of which begs the question as to why BMC switched from one to 
> t’other!)"/
> I recall reading in a TSB that the change was made because it was 
> found that the "rotor" pump was causing cam gear failures...
>
> M
> //
>
> On Mon, Dec 30, 2019 at 2:05 PM <simon.lachlan at alexarevel.plus.com 
> <mailto:simon.lachlan at alexarevel.plus.com>> wrote:
>
>     Me too. DW “High Capacity” type pump which is their version of the
>     older “rotor” type pump. It does a good job.
>
>     The newer pumps are “Gear” type.
>
>     I gathered, from people who know about these things, that the High
>     Capacity is best all round and the Rotor only comes into its own
>     at high revs.
>
>     (All of which begs the question as to why BMC switched from one to
>     t’other!)
>
>     As to County, don’t know if they’ve attempted an oil pump. Their
>     water pump is an inferior item, for sure. I studied Michaels’ blog
>     on the topic and stripping down both original types and one County
>     absolutely confirms what he says.
>
>     Simon
>
>     *From:*Healeys <healeys-bounces at autox.team.net
>     <mailto:healeys-bounces at autox.team.net>> *On Behalf Of *Bruce Steele
>     *Sent:* 30 December 2019 16:53
>     *To:* 'Michael Salter' <michaelsalter at gmail.com
>     <mailto:michaelsalter at gmail.com>>; 'Robert Begani'
>     <rfbegani at gmail.com <mailto:rfbegani at gmail.com>>
>     *Cc:* healeys at autox.team.net <mailto:healeys at autox.team.net>
>     *Subject:* Re: [Healeys] Oil Pressure and replacing the oil pump
>
>     I installed Denis Welch push rods, along with the DWR-1 cam and
>     hollow lifters, when my engine was done.  I also run a DWR high
>     capacity oil pump.  I run around 40 pounds at speed.
>
>     Bruce Steele
>
>     Brea, CA
>
>     1960 BN7
>
>     *From:*Healeys [mailto:healeys-bounces at autox.team.net] *On Behalf
>     Of *Michael Salter
>     *Sent:* Monday, December 30, 2019 6:20 AM
>     *To:* Robert Begani <rfbegani at gmail.com <mailto:rfbegani at gmail.com>>
>     *Cc:* healeys at autox.team.net <mailto:healeys at autox.team.net>
>     *Subject:* Re: [Healeys] Oil Pressure and replacing the oil pump
>
>     Hi Robert, you are the second person that I have heard of who had
>     that problem with "cheapo repo" push rods.
>
>     It seems that those that are currently available are produced with
>     too small a diameter of the cup so they seize on the rocker ball
>     and break off.
>
>     I would recommend that you inspect all the rocker ball ends
>     carefully then install a set of good used push rods to prevent
>     further problems.
>
>     M
>
>     BTW depending upon who supplied the bad parts you may be able to
>     recover the costs involved.
>
>     On Mon, Dec 30, 2019, 12:55 AM Robert Begani, <rfbegani at gmail.com
>     <mailto:rfbegani at gmail.com>> wrote:
>
>         When I rebuilt the engine last year I did not replace the oil
>         pump because I had good oil pressure. Currently, from time to
>         time, while breaking in the engine I am driving the car round
>         trip 20-30 miles down the Tamiami Trail which is an open road
>         for that stretch..  On a recent trip, the weather was cool, so
>         the oil pressure was running 35 to 40 psi while the engine
>         temperature was going up to 180 at 3000 rpm.  At 4000 rpm the
>         temperature climbed over 180 degrees and the oil pressure
>         dropped below 30 psi. .  I am considering replacing the oil
>         pump and remember that there is a discussion about the quality
>         of Moss pumps.  Maybe I should buy the rebuild kit and change
>         gears?
>
>         Oh by the way, on the last run all hell broke loose and had
>         the car towed home.  Seems the mushroom on top of one of the
>         push rods broke.  So I am replacing all 12 of them.
>
>         Regards,
>
>         Bob Begani
>
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