Engine temperaure

Hi!

What is the best temperature for a liquid cooled
engine, Fx an outboard motor, a 70cc
Moped engine, or a race/rallycar ?

A friend of mine says it is around 50 degrees celcius
and i believe its somewhere between 70 -75 degrees.

Thanks

Regards
Kaj K Thomsen
Denmark

 

Why do you have no previous Usenet history? Why are you posting
anonymously? Why should anybody waste their time answering you?

 

Been here for 3 years. Is there a law or
something that says beginners should not be allowed
to use Usenet ?

Because im sick and tired of 200 + spammails a day
if i use my real mail address.

You tell me, you answered. Now do you have an answer
to my question.


Kaj K Thomsen

 

Lol, so now one needs a posting history before recieving one of Krusty's
useless, totally off point, long-winded stories.
Kaj consider yourself lucky he didn't answer.

Typical water cooled motorcycle operates in the mid 70s C

 

Sorry. The problem in this NG is that we've been getting messages from
an argumentative anonymous troll.

 

Small bore 2-stroke engines that run at high RPM have problems with
connecting rod bearings skidding if you don't use a light grade
synthetic oil...

You could probably run the engine at cooler temperatures with a light
synthetic oil. Check with the oil manufacturer for their operating
temperature recommendations...

I had problems with Chevron 2-stroke oil distilling out and getting
thick and sitting in the bottom of the crankcase, even though my
thermostat was 82 C...

The engine had such a large cooling system, it usually didn't get up
that high, but when it did, it would start smoking badly, drawing a lot
of negative attention...

If your engine is a 4-stroke, you want the oil temperature to reach 100
C, so it will evaporate moisture out of the engine. Any sulfur in the
oil will combine with moisture and make sulfuric acid which settle out
will eat away at the parts...

Petroleum industry engineers talk about "acid dew point" and try to
always keep their equipment operating at a higher temperature to avoid
corrosion problems. Unfortunately, you can't leave your vehicle's
engine running 24 hours a day...

 

Ok. Currently i am using Castrol TTS, and havent had any problems
so far.

If i understand you correct, oil will seperate from the gas mixture
in the crankcase, if engine temperature is too low ?

The discussion was started with my friend saying that a twostroke
engine dont have a " optimum temperature" and as long its over
30 degrees celsius, all is fine. Mostly because he read it on
"somewhere on the internet ....
Many people who i regard as serious tuners, say that around 70 C
is the best for maximum power, and cylinder wear is then
kept at a minimum, i dont know what to believe ??

PS. I´m sorry if i seemed like yet another Troll, but 99%
of the newsgroups here in Denmark regarding engine tech
is inhabited by 14-16 year old "wannabee know it all"
moped heads.
So i searched thru the groups and came across this group.

Regards
Kaj K Thomsen
Denmark
( Spelling etc may be wrong, i hope you understand )

 

Excess oil in a 2-stroke's crankcase will always settle to the bottom
and it will be heated and it will eventually distill into a thick gooey
mess
down there. If you run the engine hotter, more of that oil will be
burned off immediately, instead of accumulating...

I have never seen a watercooled 2-stroke running that cold unless it
had just started. The engine needs to be warm in order to carburete
properly.
Evaporation of gasoline in the intact tract might even cause the
carburetor to ice up. If you look over in alt.motorcycle.sportbike,
you'll see a recent thread about carburetor icing...

In my experience 70 C is a bit too cold. I had watercooled 2 stroke
750cc triples that ran around that temperature and I used the Chevron
2-stroke oil which was also known as "Super Red" which the dealer
recommended. He said that the engine wouldn't carbon up with Super Red,
which was a clear oil with a red dye and it smelled like ammonia...

It's true that the engine itself didn't carbon up. It munged instead.
Mung is oily carbon that can be seen dripping out around any joint in
the exhaust system. It clogs the baffles, it gets cooked hard enough in
the exhaust pipe itself that it plugs up the system. If an engine
cannot exhaust, it cannot inhale...

Another area you might want to research is the old Saab and DKW
2-stroke
engines to find out what water temperatures they ran at. You might find
some thermostat opening temperatures. As I recall, Saab 2-strokes
didn't even have a waterpump, they used a thermosiphon cooling system,
where
heating of the water in the engine block made it rise up into the
radiator. Cooler water returned to the bottom of the engine block...

Another area to investigate would be outboard engines to learn what
their thermostat opening temperatures are, if any particular engine has
a thermostat. Outboard engines have an inexhaustible supply of cooling
water, which will be around 13C or colder all year...

 

in message

Hmm, I've always had good luck using castor oil.
Supposedly the snowmobile crowd has an injectable
castor blend these days...

I've always strived to keep the temp at 350F /
176.6C at the plug. Mind you these were aircooled
motors and displacement ranging from .020ci to
500cc. Fuels ranged from a 40%
nitro/alk/castor(15-18% worked best) to 100avgas
and Castrol 2stroke injector oil.

Really? Hmm it certainly worked good in my old
titan. But I lived where it was already over 30C
from around may to october and road alot

Oh I agree completely. Runing motor for TOO short
of a time is the worst thing you could do. They
need to be at operating temp for at least
20-30min.


--
Keith Schiffner
RCOS #7
Assistant to the Assistant Undersecretary of the
Ministry of Silly Walks.
"terrorist organization" is a redundancy

 

Keith Schiffner wrote:

Those temperatures are typical of southern Kaleeforneeyah, too.
But the top end of your air-cooled Titan was probably running up around
350 degrees and the hot cylinder was vaporizing the Chevron
2-stroke oil, using it for fuel instead of allowing it to puddle in the
bottom of the crankcase. Suzuki was ready for that puddling problem,
though. It had 2 crankcase drain plugs so you could let the mung out...

The watercooled 750 triples and the GT550 air-cooled triples had a
crankcase oil recirculating system, where a rubber hose attached to a
brass spigot in the bottom of each cylinder and ran over to the
transfer port of another cylinder, hopefully to suck the puddle of oil
out of the bottom end...

If the oil had distilled to the point it was too thick to flow through
the tiny rubber hose and the even tinier brass spigots, that system
just wasn't going to work...

 

I think it bizarre that you should challenge this guy on THOSE grounds.

 

grounds.

And I will reiterate that an AOL screen name is NOT anonymous. AOL
users
can have seven screen names which are their real e-mail addresses and
change them at will and those who access Usenet via Google Groups may
change their nicknames every few minutes if they desire and have a
different nickname for each group they subscribe to, but they still
have the same e-mail address for abuse complaints...

If you want to check my Usenet history, it's no problem at all to look
up my e-mail addy and see where and what I've been posting about...

However, it has been the practice of trolls from other ISP's to create
a nickname, post only one disruptive troll to an established NG of
responsible helpful participants, and move on to troll the next NG...

The Anagram Troll, "Dan Simper" may still be trolling 5000 NG's every
month. It posts one trolling message and moves on. Sometimes it
crossposts to multiple similar NG's...

One NG I subscribe to doesn't have much activity until the trolls
wander in, about once a month. One troll is easily identiable, it
crossposts from a related NG, and uses a nasty morbid nickname. It can
usually be found to have posted a few messages that day in slum
newsgroups predominately inhabited by other trolls and flamers and
Usenet lowlifes...

So, before I bother to waste my valuable time answering an unfamiliar
poster, I will google search the nickname to discover what that poster
is into, and, if I don't find any previous Usenet activity, it's fair
to assume that nickname is a troll and I will change the subject line
to indicate that possibility...

Changing subject lines is a strategy for stopping threads started by
trolls. It's been used for years, and will be used as long as there are
Usenet readers who get tired of trolls and flamers...

If the original poster is actually just trying to avoid spam and
returns and finds the subject line changed, that indicates a real
interest in the subject. In this case, I went back and googled for the
original poster's actual name and found several messages in Danish
indicating that he probably is real and sincere and doesn't get
involved in flame wars, so I answered him and returned the subject line
to the original question...

Now you have responded to my changed subject line, and returned it to
the top of most readers' lists and started a metadiscussion over how we
should be using Usenet to communicate...

At this point, you should answer the the OP's question about operating
temperatures, as I did, and change the subject line back to the
original...

 

krusty kritter wrote:

Snip.....

And many thanks for your answer

And just to clear things up a bit :
"Kaj Kristian Thomsen" is my real name, and i have been posting
under that name for quite a while in Danish newsgroups.
If you search further, you will find that i have been writing using only
my middle name. The reason for this, is that 2 years ago i was
active in an ( now closed ) English electronics group. And was being
**** by my first name "Kaj" so i changed it to only "Kristian"
I am posting thru a Danish ISP called TDC which is the biggest
internet provider and phone company here in Denmark.


**** I dont know the right words in English, but someone was
making bad jokes about my name.


Kaj K Thomsen

 

The right word you were seeking may be "ridiculed".

The right word for the one doing it is "Dickhead".

 

snip

Thus resulting in making yourself look like an intolerant idiot, good
system!

 

Yes, identifying possible trolls before responding to anonymous posters
with no previous Usenet history *is* a good system, but not as good as
ignoring the suspicious message in the first place. When the troll sees
that it has many orphan messages, it moves on to more fertile troll
territory, like Reeky, for instance.

So, why would *you* want to continue the metadiscussion about how
Usenet should be used, Mr. Pot? And, does the metadiscusion need to
continue for maybe 100 messages or so?

 

Utter bollocks.

 

Wonder why it's so hard to get an answer to a simple question?
I'd say the temperature specified by the manufacturer is the optimum
temperature.
My '83 Honda Shadow says the thermostat should open at 80-84C.
It's been running very cold since I bought it.
Feels like someone took out the thermostat, but it's so difficult to get
at it that I've been putting it off fixing it for two decades.
mike

--
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