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) oil. Can't wait to fly it, but next Sunday is the earliest possible opportunity, and probably more like the next weekend. Rusty (Airbike project for sale cheap on eBay now, gotta make room in the garage) ------=_NextPart_000_0001_01C4A4BA.582B6DD0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Rusty,

I've=20 been reading these post with great interest. As luck would have = it, I had=20 started out using Mobile1 5W30 oil, and switched to the 15W50 after I = decided=20 that the 5W30 was too thin.

When I=20 changed oil, I saw a 10 degree increase in oil temperature. I = thought for=20 a few minutest hat it was due to the oil, but then discounted it and = figured=20 that it was due to something else. I was making allot of changes = at that=20 time.

Maybe=20 I need to go back to the 5W30.

Steve=20 Brooks (getting pretty soggy)

-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of Russell=20 Duffy
Sent: Sunday, September 26, 2004 7:39 PM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: Oil=20 viscosity

5W30 seems a bit low.
>
>
I was = thinking the=20 same thing. Leon, will an
extremely light oil be able to keep = the=20 seperation
between the bearings and shaft? On the other = hand,
will=20 it 'wet' the walls of the cooler better and
thereby transfer heat = more=20 efficiently?

Since = when it 30=20 weight oil is "extremely light"? You might call it = extremely=20 standard, or extremely normal :-) As I understand it, the first = number=20 is the cold rating, which is just for cold starting, so it doesn't = have any=20 effect on normal operation.

BTW, I = made about 3=20 trips around the airport (on the ground of course), and just made it = to 140=20 degrees. I'm convinced it's cooling much better with the lighter = (though=20 not extremely light <g>) oil. Can't wait to fly it, but = next=20 Sunday is the earliest possible opportunity, and probably more like = the next=20 weekend.

Rusty = (Airbike project=20 for sale cheap on eBay now, gotta make room in the = garage)

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