[Healeys] oil pump

E.A. Driver edriver at sasktel.net
Tue Oct 30 14:01:45 MDT 2018

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 issues.

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
> Bob
> On 10/30/2018 5:12 AM, simon.lachlan at alexarevel.plus.com 
> <mailto:simon.lachlan at alexarevel.plus.com> wrote:
>     Hi,
>     Has anyone got the Denis Welch oil pump ENG672M? See:-
>     https://www.bighealey.co.uk/performance-parts/austin-healey/engines/3000-bottom-end?page=3
>         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.
>     Thanks,
>     Simon
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