[Healeys] Oil Pumps

[Harold Manifold]

Lets not forget the pressure relief spring, accuracy of a 50 year old Healey
oil pressure gauge, type of oil, engine RPM, etc are all variables affecting
the oil pressure reading.
 
Happy New Year to all.... Harold

  _____  

From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Bob
Spidell
Sent: Wednesday, January 01, 2020 6:56 PM
To: WILLIAM B LAWRENCE; healeys at autox.team.net
Subject: Re: [Healeys] Oil Pumps


OK, that makes sense.


On 1/1/2020 5:51 PM, WILLIAM B LAWRENCE wrote:


If you look at their construction the rotary pumps have four lobes that pump
a large slug of oil for each cycle with each slug causing a load on the
drive train. The gear pump has multiples of the number of lobes, but they
are all smaller and so the load that each slug imposes is less. The total
mass of oil pumped during a revolution will be approximately the same as a
rotary and the total power needed to pump that volume may be close to the
same, but the average stress load will be less due to the smaller slugs
being supplied.

Bill Lawrence
BN1 #554
  _____  

From: Healeys  <mailto:healeys-bounces at autox.team.net>
<healeys-bounces at autox.team.net> on behalf of Bob Spidell
<mailto:bspidell at comcast.net> <bspidell at comcast.net>
Sent: Thursday, January 2, 2020 12:33 AM
To: healeys at autox.team.net  <mailto:healeys at autox.team.net>
<healeys at autox.team.net>
Subject: Re: [Healeys] Oil Pumps 
 

I'm gonna make a SWAG that racers routinely run at 6K RPM or more. I 
rarely go over 3,500 RPM in my BJ8, with 3.54 diff, and the 100s are 
known to break crankshafts if driven at 4K for long.   Either the gear 
pumps run at reduced pressure at lower RPMs or the pulsed output of the 
vane-type is causing the problems.

The DWM tech/sales people recommended the HC pump to me, and I asked 
about their suitability; hence my questions about the company.  From 
their glossy catalog:

"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."


On 1/1/2020 3:43 PM, richard mayor wrote:
> We racers have known about the dangers of using the rotor style pumps 
> for decades. I personally know more than half a dozen racers who 
> destroyed their camshafts using high volume oil pumps back in the 90s 
> - including me. I lost two camshafts!  Jeff Johnk built a test bed, 
> did extensive testing of more than 50 hours on both style pumps, and 
> wrote an exhaustive article that appeared in the May, 1998, issue of 
> Chatter, entitled Pumped Up For Racing.
> I suggest than anyone who is thinking about using a rotor style pump 
> read this article first.
> Think about this for a minute. The rotor style pump caused problems in 
> the 2.6 liter 100/6 motors. Austin changed to a gear style pump a 
> month or so into the production of the 2.9 liter 3000 motors and the 
> problems went away. Why would anyone want to use a 100/6 oil pump?
>

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