<<If you were using very heavy race oil, like straight 50 sae or possibly 40
sae, and it was very cold in the early morning when the engine was first
started, >>
On a related topic -- at what point does it become too cold to use our normal
heavy racing oil? In my Spit, I've typically used 20w50. At The Loooong Race
this fall, the morning temps got down to the low 30s. The car ran fine
initially, but got progressively worse through the morning sessions. By noon,
we determined that we had 7 perfectly good cam lobes and one not so good.
Number 1 valve was no longer moving much at all.
I'm guessing the oil was a bit too thick for use in those conditions --
there's no other obvious reason why the cam should have had a problem. Live
and learn.
What do others do? At what temp do you decide to use a lighter weight oil?
Scott B.
-----Original Message-----
From: owner-fot@Autox.Team.Net [mailto:owner-fot@Autox.Team.Net]On
Behalf Of Greg Solow
Sent: Wednesday, November 29, 2006 10:31 PM
To: Jack W. Drews; fot@autox.team.net
Subject: Re: [FOT] blow-ups
If you were using very heavy race oil, like straight 50 sae or possibly 40
sae, and it was very cold in the early morning when the engine was first
started, the pressure drop accross the oil filter element might be so high
that the filter could collapse or ortherwise fail. You want the filter to
bypass under conditions like this. Once the oil is over 140 degrees or so,
we want all of the oil to be filtered. Increasing the spring pressure might
be a better idea. I so know the blocking the by-pass so it will not ever
open is something that is done on engish ford engines, but they typically
run maximum oil pressures around 60 psi. while on my "tractor engines" we
usually run maximum pressures around 90 psi.
Greg Solow
----- Original Message -----
From: "Jack W. Drews" <vinttr4@geneseo.net>
To: <fot@autox.team.net>
Sent: Wednesday, November 29, 2006 6:03 PM
Subject: [FOT] blow-ups
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