This has been a fascinating discussion! I was not aware of this valve, does
it regulate the oil pressure in the engine or just to the gauge? If to the
engine, could it be part of the reason I am seeing excessive leaking from my
brand new rear main seal?
Right now, most of time, driving at 3000rpm yields a pressure reading of
80-90psi.
Bill Beecher
'58 TR-3A TS/30766 L (On the road in 2009!)
"A Triumph is man's best friend, it always comes when it is called...of
course, some times it is difficult to make it go"
-----Original Message-----
From: triumphs-bounces@autox.team.net
[mailto:triumphs-bounces@autox.team.net] On Behalf Of dlylis@gmail.com
Sent: Wednesday, September 16, 2009 8:54 AM
To: Andrew Uprichard; triumphs-bounces@autox.team.net; 'Randall';
triumphs@autox.team.net
Subject: Re: [TR] Oil Pressure
I paid a lot of attention to clearances when I rebuilt my 3A motor. I have
55 at hot idle and can clearly see the bypass valve function at 75 lbs when
I wind the motor over 3500. 20/50 oil.
New gauge so I am reasonably confident of the numbers.
There, I have showed you mine! ;-)
Sent via BlackBerry by AT&T
-----Original Message-----
From: "Andrew Uprichard" <auprichard@comcast.net>
Date: Wed, 16 Sep 2009 05:35:52
To: 'Randall'<tr3driver@ca.rr.com>; <triumphs@autox.team.net>
Subject: Re: [TR] Oil Pressure
List: thanks to all who replied.
As usual, I like Randall's caveat. My newly-rebuilt engine was reading 50
at idle and 80 at 3000 rpm: I dialed it back by adjusting the set-up on the
filter head and now it reads 30 and 50 respectively. My other car has a
much wider span of pressures over the rpm range, so I think I'll get the
gauge checked out as well.
Andrew
-----Original Message-----
From: triumphs-bounces@autox.team.net
[mailto:triumphs-bounces@autox.team.net] On Behalf Of Randall
Sent: Wednesday, September 16, 2009 2:54 AM
To: triumphs@autox.team.net
Subject: Re: [TR] Oil Pressure
> Before I give away my numbers, what range (idle to full
> acceleration) should
> one aim for with oil pressure on a TR3?
while I agree with Tony's numbers, I have seen TR3 engines survive with much
less. In fact, I drove a whole year with an engine that showed no pressure
at all at hot idle, and no more than 30-40 psi at hot cruise with the
heaviest oil I could find.
I'll also throw out my usual caveat : Before you get too concerned over what
the gauge reads, make sure it is accurate. Old gauges frequently lie.
Randall
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