[Healeys] oil pump
bspidell at comcast.net
Wed Oct 31 00:16:44 MDT 2018
It's kinda like blood pressure. Except, lower BP is better.
On 10/30/2018 6:55 PM, Engl wrote:
> Hi Ed
> Indeed, oil pressure on your car (still think of it as your car!) is
> great as you indicate.
> Bob England
> On Oct 30, 2018, at 2:01 PM, E.A. Driver <edriver at sasktel.net
> <mailto:edriver at sasktel.net>> wrote:
>> Good afternoon
>> As with Bruce and Bob at rebuild of a BJ8 engine I added DWR hcpump
>> in 2000, although I sold the car in 2016, I assume the current
>> owner will verify that oil pressure during driving still ranges
>> from 55 to 60 psi and at idle 20-25psi. As Michael has stated if the
>> correct bearing clearances were met during rebuild there should be no
>> E.A. Driver
>> Web master Saskatchewan British Car Club
>> Saskatoon, Saskatchewan
>> On 30/10/2018 9:52 AM, Bruce Steele wrote:
>>> I echo Bob’s comments. I’ve had the DWR high capacity pump for years.
>>> Bruce Steele
>>> Brea, CA
>>> 1960 BN7
>>> *From:*Healeys [mailto:healeys-bounces at autox.team.net] *On Behalf Of
>>> *Bob Spidell
>>> *Sent:* Tuesday, October 30, 2018 7:17 AM
>>> *To:* healeys at autox.team.net
>>> *Subject:* Re: [Healeys] oil pump
>>> I'll offer what I know/have heard*. I have the 'high capacity' type
>>> in my BJ8, which is what the DWR techs/sales people recommended for
>>> a road car. Older 6-cyl cars had a rotor type pump. They (the
>>> rotor type) are supposed to be more efficient--i.e. they pump more
>>> oil--at lower RPMs. At some point it was discovered, probably from
>>> service bay repairs, that this type of pump put an excessive shear
>>> load on the bevel gears on the cam that drive the pump, causing them
>>> to wear out. Later cars started getting the gear type pump, which
>>> is less efficient at lower RPMs but puts less of a load on the cam,
>>> and is probably less expensive to manufacture as well (esp. if the
>>> gears are the sintered iron variety). I think the bevel gears on
>>> the cams were re-engineered, IIRC they got an additional tooth to
>>> spread the load.
>>> The Welch HC pump is the rotor type. I did a full engine rebuild
>>> and installed the DWR HC pump; I didn't notice any pressure change
>>> worth mentioning--I 'gained' 15 PSI at idle when I had my gauge
>>> overhauled--but the 'high capacity' I believe refers to volume
>>> rather than pressure (which, of course, is mostly dictated by engine
>>> speed). The 'standard type' pump is a gear type, hence it's more
>>> appropriate for high-RPM race engines as pump flow is proportional
>>> to RPM, and at 6K RPM or more you'll get plenty of oil with less
>>> load from the gear type.
>>> I'm not positive, but if you look at the photos closely, you can see
>>> the 'gallery plug' on the top of the case. I suppose it allows
>>> inspection of the innards of the pump without having to break the
>>> case. I believe it's threaded so not likely to pop out. If you're
>>> getting a new pump you'll likely need a new drive shaft and,
>>> surprisingly, DWR sells it cheaper than our (US) vendors sell it at
>>> (I think they might import the DWR shaft).
>>> * apply appropriate grains of salt
>>> On 10/30/2018 5:12 AM, simon.lachlan at alexarevel.plus.com
>>> <mailto:simon.lachlan at alexarevel.plus.com> wrote:
>>> Has anyone got the Denis Welch oil pump ENG672M? See:-
>>> Their text:- “Heat treated castings for longer life and
>>> removable gallery plugs to be sure it is clean are
>>> advantages of both types of oil pumps we offer. We recommend
>>> the high capacity for all road engines using a standard type
>>> crank up to 6000 rpm and the standard pump for race engines,
>>> steel cranks or anything over 6000 rpm. Both are precision
>>> machined and assembled in-house to control the highest quality.
>>> - ENG672 is the standard type.
>>> - ENG672M is the high capacity pump.”
>>> What are “removable gallery plugs”?
>>> Is it just me or is the above a bit counter-intuitive? “High
>>> capacity” for road cars and “standard” for race engines? Surely
>>> the highest capacity is needed where the engine is working
>>> hardest ie racing?
>>> And don’t I remember that, with the standard BMC pumps, the
>>> older type is reckoned to be better than the newer type? Is this
>>> something similar to Denis Welch’s two pumps?
>>> Anyhow, if anyone’s got one…..what’s it like? Did the oil
>>> pressure improve at all?
>>> I’m guessing that most people will have fitted one as part of a
>>> big rebuild thus they won’t have straightforward “before and
>>> after” comparisons. I’m thinking of fitting mine to my engine as
>>> part of a small winter project and hope I can squeeze a few more
>>> psi into the system.
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