[AJD] Physics 101

[Terry L. Hrdlicka]

Cal,

Don't know a lot about the physics involved, but here's what I have 
observed about the old iron/temp/weather relationship:

Sunny, calm, 78*, no work to do, just want to putt around the pasture:
Fires up in the first 1/100 revolution and purrs like a kitten.  Runs so 
smooth it would balance on 1 coke bottle.

Sunny, calm, 78*, just want to show your buddy how easy it starts after 
your new tune up:
Cranks 'till the battery is almost dead/you can't lift your arms, 
realize you shut off the gas.  Turn on gas, flood engine, gas soaked new 
plugs won't fire, replace plugs, finally starts on one cylinder and runs 
like crap.  Buddy goes home with smirk on his face.

Cloudy, windy, 45*, going to cut fire wood in the draw 1 1/2 miles from 
the house:
Fires up in the first 1/100 revolution and purrs like a kitten.  Backs 
itself up to the trailer, perfectly aligned with the hitch the FIRST 
time and runs better than it ever did out to the draw.  Shut off 
tractor, fill trailer with wood.  Start tractor to go home, runs on 1 
cylinder, barely pulls itself in 1st gear.  Takes forever to get home 
driving into a 45 MPH wind all the way.

Sunny, calm, 20*, just want to see how it starts when it's this cold:
Fires up in the first 1/100 revolution and purrs like a kitten.

Cloudy, windy, freezing rain, sleet, snow, -5*, pick-up stuck in snow 
from trying to pull mamas mini van out of a snow drift:
Starts reluctantly in machine shed.  Runs O.K. 'till you get hooked up 
to the pick-up.  Starts to miss and will barely pull itself.  Get pick 
up unstuck, limp back to machine shed to see what's wrong with tractor.
Go in house to have a shot of schnapps and thaw out frozen hands. 
Listen to mama b!#&h because her mini van is still stuck and she's 
supposed to pick up "the girls" for basket weaving class in 1/2 hour. 
Listen to mama b!#&h some more about the time and money you've spent 
when you tell her the tractor isn't running right.

Sunny, calm, 10*, mama's mini van unstuck by neighbor down the road with 
a RED tractor, go to machine shed to try to figure out why tractor won't 
run right:
Fires up in the first 1/100 revolution and purrs like a kitten.

:)

Terry

P.S.

Hope this post hits the list before the spring thaw!








wb5cys wrote:
> What is the physics behind our old treasures being harder to start in 
> cold weather?
> 
> Is the ignition system affected by the cold?
> Is the fuel mixture somehow different?
> Is it harder to burn the fuel mixture enclosed by cold iron?
> The physical effects of the thickened oils are obvious, but are there 
> other issues with oils as well?
> What about air intake?  Any changes there?  Am I more likely to suck a 
> glob of oil from the breather into the carb during cold weather?
> Aside from the obvious effects from freezing, does the coolant system 
> behave differently during cold weather?
> 
> My old John Deere tends to wake up pretty well on a cold morning, about 
> as well as I do, but the definition of cold here in Texas is different 
> than it is elsewhere.
> 
> Thanks!
> 
> Cal B.
> Nacogdoches, Texas
> _______________________________________________
> Antique-johndeere mailing list
> http://www.antique-tractor.com/mailman/listinfo/antique-johndeere
> 
> 




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