Rick,
When I was campaigning a road racer I ran 50 wt oil mainly because of the
sustained heat that the engine had to endure. If heat is a problem with a
specific turbo application I couldn't agree more with you, but at LSR events I
generally worry more about getting oil up to operating temps.....In my N/A
engine, I never see water temps above 210 (I try to leave the line at 160 deg
at least) at the end of 5 miles , but with a 12 qt dry sump, the oil temps are
not even close to engine temps. 50 wt oil would need to be pumped with a
concrete pump at the winter meets ( I use a roots-style oil pump instead of
the typical Aviad). But what I'm trying to say is oil protects best at
operating temperature..... Would like to hear your take on typical lakes cold
starts from the start line and viscosity.
Ed
-----Original Message-----
From: Rick Byrnes [mailto:Rick@RBMotorsports.com]
Sent: Monday, July 29, 2013 06:14 PM
To: drmayf@mayfco.com, land-speed@autox.team.net
Subject: Re: [Land-speed] Oil and Filter Recommendations...
Mayflong time no hear. Hope all is well.Some time ago I had a discussion with
a Roush engineer, who oversaw testing of various viscosity oils. There was NO
overwhelming data that could lead me to run anything but Mobil 1 50 wt racing
oil.The hp difference was not huge and in a turbocharged engine even with many
stage dry sump, it wasn't worth it. The Merk always had fresh after each
event. This was some time ago, and there may be some testing data to show some
hp gains, but without a lot of data, I don't intend to change in the
foreseeable future even on my N/A motor.Hope to be testing the liner with
partial body next spring at Wilmington. I'm so far behind that I don't know
when I can hit the salt again. (BUT I WILL)
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