hmmm,......could be.

 I don't see why increased windge from higher rpm in top gear would raise
oil temps.
Windage  may be one factor in dry sump engines...and
for many performance cars the primary purpose is to lower the engine as far
as possible in the chassis, lowering certer of gravity for better handling.

Be interesting to see what Frand G says on the subject,
and I'm sure he has posted on oil temps somewere in the past.

----- Original Message -----
From: "Dennis Haynes" <d23haynes57@HOTMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Saturday, May 22, 2010 6:41 PM
Subject: Re: Optimum WBX rpms; was RE: 4 speed/5 speed shifter

It does. Even with high capacity oil coolers I see the oil temp increase at
higher speeds over time, even with the water temp staying normal. Most
likely the problem is the increased windage from the rotating parts sitting
in the oil. This is why many race engines run dry sumps.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Dave Mcneely
Sent: Saturday, May 22, 2010 7:56 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Optimum WBX rpms; was RE: 4 speed/5 speed shifter

---- Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM> wrote:

> I do not see any reason why 4,200 rpm would produce particularly  higher
> oil
> temps than 3,800 rpm would.
> other than slightly increased load due to speed and aero drag ...
> I see no reason especially why oil temps would be higher with a bit more
> rpm.
> Scott

Scott, maybe it's the slightly increased load.

David McNeely