<VV> Oil pump pressure control
Sethracer at aol.com
Sethracer at aol.com
Tue Nov 18 14:42:41 EST 2014
The spring seats in a plunger that rides between two cavities in the rear
housing. One cavity is connected to the output of thee pump, the other is
connected to the input of the pump. As oil pressure comes up on the front of
the plunger, (exposed to the cavity from the output of the pump), it pushes
the plunger down in the bore - against that spring that you found. As the
plunger moves in the bore, it exposes the second cavity. Since that cavity
is much lower in pressure, being the feed to the pump from the pickup in
the oil pan, the oil bleeds off into the second cavity and back into the
pump. This keeps the oil pressure in the system at pre-designed levels. The
spring can be shimmed or stretched to raise the pressure point where the oil
is recirculated. That raises the oil pressure in the motor, at least at the
input to the oil galleries. In general, the stock Corvair pump is up to
the task of maintaining adequate pressure in the system. Replacing the
standard pump with a high-volume pump often means the pressure limiting system
will just remain open more and recirculate the oil. If the system has been
modified, as an example - to pump the oil up to the front of the car to a
cooler and remote filter - The increased volume from the bigger pump might
regain the oil pressure you must have inside the motor. Otherwise, there is
really no need for it. - Seth Emerson
In a message dated 11/18/2014 11:14:38 A.M. Pacific Standard Time,
virtualvairs at corvair.org writes:
Another question I have that was mentioned earlier was the pressure relief
valve. I took it apart and appears to be nothing but a spring in there.
What function does that do. Not sure if I understand how it can control
oil pressure??? Ken Clark
To: kcvair at hotmail.com
Subject: Re: <VV> Oil pump
From: jwcorvair at aol.com
Date: Mon, 17 Nov 2014 10:12:03 -0500
I use either Valvoline or Castrol petroleum based oil. 10-30 in the winter
20-50 in the summer. I change oil every 3,00 miles or so and I have a
couple of small leaks, about a quart in 3,000 miles, so until I rebuild my
engine, it doesn't seem worth the cost to go to synthetic.
Joe
-----Original Message-----
From: Ken Clark <kcvair at hotmail.com>
To: jwcorvair <jwcorvair at aol.com>
Sent: Sun, Nov 16, 2014 7:50 pm
Subject: RE: <VV> Oil pump
I'm using a 10w40 mobil1 which I have not had any problem with any of my
other cars.
Ken Clark
> To: virtualvairs at corvair.org
> Date: Sat, 15 Nov 2014 10:05:53 -0500
> Subject: Re: <VV> Oil pump
> From: virtualvairs at corvair.org
>
> Out of curiosity, what weight oil are you running? When I go to 10-30
for winter driving, my oil pressure fluctuates similar to what you describedl
>
>
> Joe White
> (62 four door, 64 Spyder project, 66 PorVair)
>
>
>
>
> -----Original Message-----
> From: Ken Clark via VirtualVairs <virtualvairs at corvair.org>
> To: MarK Durham <62vair at gmail.com>; BobHelt at aol.com <bobhelt at aol.com>
> Cc: virtualvairs <virtualvairs at corvair.org>
> Sent: Thu, Nov 13, 2014 6:35 pm
> Subject: Re: <VV> Oil pump
>
>
> Thanks to all for the info, I will get it solved one way or another,
will take
> all info received into consideration. I did however fail to mention
that this
> engine was rebuilt several years ago with new bearing, rings etc., but
does not
> have 100 miles on it as it has sat in the Lakewood for at least 3 years
and not
> run for at least 2 of those years. It does seem like a strong engine
when I
> drive it, so that part is fine. Hope to have it in good condition to
take to
> Knoxville next summer.
> Ken
>
> Date: Thu, 13 Nov 2014 12:13:45 -0800
> Subject: Re: <VV> Oil pump
> From: 62vair at gmail.com
> To: BobHelt at aol.com
> CC: virtualvairs at corvair.org; kcvair at hotmail.com
>
> Ken, if you have better pressure some time and not others under the same
or
> similar conditions its probably the pressure relief valve. Worn Cam
bearings
> would give consistent low readings. Replace the relief and the spring
first
> and see what you get.
>
> Mark Durham Hauser Idaho
>
> 62 Coupe 4 speed Red/Red.
> On Nov 13, 2014 9:52 AM, "BobHelt--- via VirtualVairs"
<virtualvairs at corvair.org>
> wrote:
> Ken,
>
> Nothing wrong with the oil pump from what you said. Problem is likely
worn
>
> cam bearings. The dash light illuminates at 4-6 psi. Some pres senders
>
> close at a higher pressure so check that you have the one designed for
our
>
> Corvairs. I.e., check pressure at which your light comes on.
>
> Sure, a hi-vol opil pump is the sure cure for this problem. Go for it.
But
>
> be careful in the future not to rev a cold engine too high. Might
consider
>
> also opening the pres valve by-pass hole to accommodate a higher cold
flow.
>
> Regards,
>
> Bob Helt
>
>
>
>
>
> In a message dated 11/13/2014 10:07:01 A.M. US Mountain Standard Tim,
>
> virtualvairs at corvair.org writes:
>
>
>
> I'm not getting a good reading on current oil pump in my Lakewood and
>
> wondered if anyone had put in the new high volumn pump and did it do
the job?
>
> Oil pressure light flickered some while running, so put in a gauge to
see
>
> what it read. Seemed ok at first, but not sure as it sometimes goes
>
> somewhat low. Started out at 25-30 at first when idling cold, but
dropped some
> as
>
> warmed up, and 35-40 when engine revved up slightly. At times dropped
to
>
> quite lower reading, so don't know what to think about it. Considering
>
> getting the higher volume pump to put in. Any suggestions or answers to
>
> what's going on with current oil pump?
>
> Ken Clark
>
>
>
>
>
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