Dave
My Tiger with 260 has 50 psi cold, 45 psi hot at idle and stays
there at all speeds.
I believe I have read where the minimum oil pressure can be 10 psi at idle
and then 5 psi added for every 1000 rpm.
Personally I would be concerned about the oil system if the oil pressure
dropped below 30 psi.
Ron Fraser
-----Original Message-----
From: tigers-bounces+rfraser=bluefrog.com@autox.team.net
[mailto:tigers-bounces+rfraser=bluefrog.com@autox.team.net] On Behalf Of
Dave Munroe
Sent: Friday, August 29, 2008 12:15 PM
To: MWood24020@aol.com
Cc: tigers@autox.team.net
Subject: Re: [Tigers] How hot is hot ?
Optimal oil pressure....
A question I was afraid to ask. I have seen on this list and others, as well
in propaganda from owners trying to sell their cars,
claims of oil pressures in their SBF's of 60 psi at "speed".
My oil pressure at start-up cold is 45 psi on the gauge, dropping to 30 as
the engine heats up and reaches 225 230F at 3,000 rpm and up. It would drop
to 20 at idle "hot".
Now that I have it running at 180-190F, cold pressure is still 45psi. but it
never drops below 40psi, now, at operating temp.
Hot-rodder's I have spoken with say 10 psi per 1,000 rpm is lots for a
"built" engine.
What's considered normal or adequate by the Tiger community??
Dave
----- Original Message -----
From: MWood24020@aol.com
To: dave@munroe.ca
Cc: tigers@autox.team.net
Sent: Friday, August 29, 2008 12:28 PM
Subject: Re: [Tigers] How hot is hot ?
In a message dated 8/29/2008 8:03:06 A.M. Pacific Daylight Time,
dave@munroe.ca writes:
One of the reasons why I worry about my engine overheating ( 225- 230F)
is
the noticeable drop in oil pressure.
When you did your oil temp testing on horsepower gain, did your FF oil
pressure drop with a rise in oil temp?
Which, I guess, brings us to another (but, linked) discussion: "optimal"
oil pressure ;-)
Yes, we did see drop in oil pressure. Idle pressure, post race, was in the
10 psi range with about 25-30 psi at anything over 3000 rpm...which was
plenty in that application, evidently, as we went two years without an
engine failure. When the motor was taken down, bearing wear was normal. Keep
in mind, this is just a VW motor, air cooled, low(er) rpm etc.
The other thing that I didn't consider, when I posted earlier, was
excessive piston/piston crown heat, which can lead to power loss...in some
cases, TOTAL power loss...I was thinking more of elevated engine heat in the
intended operating range.
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