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From: grego@athena.UUCP (Grego Sanguinetti)
Newsgroups: net.cycle
Subject: Re: What oil do you use?
Message-ID: <186@athena.UUCP>
Date: Wed, 13-Feb-85 19:28:26 EST
Article-I.D.: athena.186
Posted: Wed Feb 13 19:28:26 1985
Date-Received: Fri, 15-Feb-85 04:49:55 EST
Organization: Tektronix, Beaverton OR
Lines: 34


	Well I use Kendal 10-40w now because it's good oil and I work very
close to a distributor. I have used Caster oil, Valvoline, .... and
they all work pretty well except at extreme temps. When it is below
freezing, and you insist on ridding (better man than I GungaDin!), no
oil is really going to do the job before the engine is warmed up. I 
would suggest rigging an electric blanket or dipstick to warm the
oil up before starting the engine. Cold wheather starting is hell on
engine internals. Engine tolerances are all designed for operating
temperature. that means that parts are *MUCH* tighter when the engine
is cold.  This means wear and tear in a big way.
	The only time I've run single weight oils in a bike was in 4stroke
racing engines. In that environment temporatures are kept in a known
range and warm-up time is very controled. The engine oil only had to
survive for a couple of engine-hours and all in one or two days. We
used 40w since the engine was running a high temp. We had no problems
lubricating the top-end. We did, however, enlarge the oil galleries
and fittings.
	The major problems with using single weigth oils in
street bikes is the conflicting requirements of the transmission and
valve train. The valve train wants thin oils so that the pump can get
enough oil up to the cams and tunnel it through the tight cam bearings
and valve mechanics without introducing mechanical resistance due to
heavy oil. The transission on the other hand, wants thick transmission
oil to stick to the big gears. Remember that the transmission turns much
slower than the valve train. 

			YACS   (Yet Another Compromise Situation!)

					Grego Sanguinetti

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