Mark Andy wrote:
> Interesting... I didn't know there was a difference in two stroke oil
> between air & water cooled motors. Which is designed to run hotter...
> The Air cooled stuff?
Yes.
The water cooled oil is primarily for outboard motors, which are
water cooled except for a few tiny ones.
Because of how much oil a big 200hp outboard can drink, many times
the wall of oil in the store will be all outboard motor oil except for a
tiny strip of air cooled bottles.
These things sip oil.
When we bought our first house a while ago, my wife bought me a small
gas weedwhipper as a birthday gift. It remains the only brand-new gas
powered anything I've ever owned.
Anyways, it came with a tiny bottle of oil and said something like
"mix with 4L of gas".
So I dutifully bought 4L of gas, and poured it in. Then after using
the thing for a month, I realized that 4L of mixed gas is a lifetime
supply of fuel for a weedwhipper.
I used that fuel can for about 6 years, and each year the weedwhipper
ran progressively worse. I knew it was the bad fuel but it still ran so
I figured I would just try to use it up.
Finally it just got that it was so hard to keep running that I poured
the remainder in my big boat tank. Now I mix gas for it in a juice jar
about two cups at a time. That can last me a whole year of just
weedwhipping my suburban house.
> What symptoms will using water cooled oil in an
> air cooled motor have?
I've done it in a pinch, but it's probably akin to running too-thin
oil in your car. At high temperatures it's probably very thin and not
very protective. It pours like water even from the bottle.
> The fuel pump is in the carb or separate?
As already mentioned, it's usually part of the carb. (not just small
engines do this, my 16hp lawn tractor has a combined pump/carb and
combined rebuild kit)
My tiny weedwhipper has the entire carb and pump machined out of a 1"
cube of aluminum. Looks like a borg ship. Amazingly integrated and very
impressive that they managed to make a carb and a fuel pump with only a
few drilled holes, some gaskets, and one plate that covers one side and
provides other half of the fuel pump.
--
Trevor Boicey, P. Eng.
Ottawa, Canada, tboicey@brit.ca
ICQ #17432933 http://www.brit.ca/~tboicey/
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