It's often a good idea to heat your oil before starting your car in
the cold, as I'm sure our minnesota and wisconsin brethren can
attest. Either a dipstick heater or a quick drain and heating the oil
on a camp stove will suffice. Most F1 and other racing cars require
their oil to be heated before starting.
On Dec 1, 2006, at 6:40 AM, Barr, Scott wrote:
> <<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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