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On Thu, 10 Jun 2010 13:58:33 -0400, "Existential Angst"
wrote:
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. ..
On Thu, 10 Jun 2010 13:35:55 -0400, "Existential Angst"
wrote:
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m...
On Thu, 10 Jun 2010 13:25:03 -0400, "Existential Angst"
wrote:
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news:gce11616p2hrb41i262nlt2jru5pd67lr7@4ax. com...
On Wed, 9 Jun 2010 20:50:40 -0400, "Existential Angst"
wrote:
"J Burns" wrote in message
...
jamesgangnc wrote:
On Jun 9, 3:24 pm, J Burns wrote:
A decal on my furnace blower seemed to say the motor was
permanently
lubricated. The other day I got my head a little lower and saw
a
second
decal saying it should be lubricated every couple of years with
20W
nondetergent oil.
I think 3-in-1 is like that, but I can't find my can. I did
find
a
4-ounce container of Marvel Lubricating Oil. Among the uses
listed
on
the label is "small electric motors."
Small is relative. Would Marvel Lubricating Oil be good for a
furnace
blower?
I'd say it's a bit thin. My walmart has 30wt nondetergent. I'd
probably lean that way if I couldn't find 20wt. Nondetergent
also
gets used in things like pressure washers.
Thanks, it looks as if you and Salty Dog are right.
One way to measure viscosity of motor oil is cSt at 40C. CSt is a
measure
of the number of seconds it takes a certain amount to drain
through
a
certain tube.
At 40C, the cSt of 10W should be 25-35
20W 40-80
30 80-120
I have a fresh can of 10W-30, a remnant of 30W nondetergent in a
can
I
bought last year, and a little 20W-50 in a can several years old.
I
started with the 10W-30 because it's the freshest.
seconds at 25C
10W30 22
20W50 40
30W 47
If the 10W30 has a cSt about 30, the 20W-50 has a cSt of 55. So
far,
so
good. The 30W ND seems to have a cSt of 64, like 20W oil. So
maybe
that
brand of 30W could pass for 20W.
The Marvel Lubricating Oil? Three seconds!
Good show, very inneresting.
But simply shaking MMoil, or feeling it, tells you its too thin.
My jugs of it tout it as an additive. So you may be able to "cut"
some
of
the oil you have, and use it in your motor, if the oil you have
feels
too
thick. Or perform you cSt test on various mixtures..
REALLY bad advice.
Why?
You mean other than the fact that ANY advice from you is usually
REALLY bad advice?
Yup.
Marvel Mystery Oil is about SAE 3W, which is quite a bit thinner than
the SAE 20w called for in this application.
Still don't understand "mix", eh?
You may as well thin the oil with gasoline. You'll have similar
results.
You are a chemist, now? Gasoline is short/medium-chain hydrocarbons.
MM oil is...... ??
It is also quite flammable at relatively low temps.
See my other post. You are dead wrong.
How inconvenient for you:
http://en.wikipedia.org/wiki/Flash_point
And???
Once again - the flash point (now that you know what it means) for
Marvel Mystery Oil is 128 degrees F.
How do you know it is 128 F??
The product is labled "DANGER - COMBUSTIBLE" in LARGE TYPE on the
front of the can,
Except you were saying it would burn up in an electric motor.
I put it in a blue flame, and it did not burn. Are you still not
understanding this?
Combustibility has to do with a flammable vapor, not the liquid itself. The
whole concept is essentially irrelevant in the context of a bronze bearing
in an electric motor, yet you keep harping on it.
If the context were 55 gal open drums in a warehouse where welding was going
on, then yeah, there is a cause for concern, but this is a totally different
context. Absolutely no appreciable vapor of MM oil, by itself and certainly
if mixed with 30 or 40 wt oil, could *possibly* accumulate in an electric
motor, esp. with air currents inherent around 99.999% of motors, ESP a
blower. From what, mebbe 1 cc of MM oil???
Which makes you are a straw-clutching idiot. Just like in those horsepower
threads, which you are apparently still smarting from.
and the MSDS also confirms that it is considered
flammable.
Wrong again.
For a material to be classed as flammable, the flash point needs to be below
100 F.
Which is proly why the MM oil label did not say "flammable".
Show us how the MSDS considers MM oil to be flammable.
How long are you going to persist in this?
You do have tenacity, I must say. Which is often associated with stupidity.
--
EA