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echo: aust_avtech
to: Rod Gasson
from: Rod Speed
date: 1997-03-19 07:14:08
subject: car

PE> The negative node/terminal (forget the proper name)
PE> on the battery was very hot, too hot to touch.

TS> If it's your lucky day, the battery hasn't been
TS> charging because of the faulty earth contact.

PE> Can you tell this from the fact that it's hot?

RG> Can we tell it is a faulty contact from the fact it's
RG> getting hot? Sure we can - a good contact doesn't get hot.

RS> Why just one ? Thats the give away, indicates its not as good a contact
RS> as the other one. Both obviously have the same current going them.

RG> What is it with you Spood...

We already know what it is with you Gaston, gross
brain damage. Its less clear what produced that gross
brain damage or even if you were born like that.

RG> To PaulE you say this, yet in the msg to me written less
RG> than 1minute before, on the very same topic, you wrote..

RG> Can we tell it is a faulty contact from the fact it's getting hot?
RG> Sure we can - a good contact doesn't get hot.

RS> Thats not necessarily true either if its been cranked over for quite a
RS> while with the engine not starting, enough to flatten a normal battery.

RS> It may well get quite hot even with a viable earth contact.

RG> Fucking amazing eh...

Nope, the evidence of your gross brain damage has become so florid
now that nothing is at all amazing when you flaunt the problem again.

RG> To the VERY SAME COMMENT, to me, you say "not necessarily true" yet
RG> to Paul you are agreeing with me by saying "Thats the give
away.... "

Shit you really are a terminal fuckwit Gaston. Lets go thru it very
very slowly for the grossly brain damaged. Yes, if it gets hotter than
the other one, clearly the contact isnt as good as the other one.

BUT, now wait for it, THAT CONTACT THAT GETS HOT CLEARLY WAS ADEQUATE
TO ALLOW THE ENGINE TO BE CRANKED OVER FOR A LONG TIME WHEN THE ENGINE
WOULDNT START, CRANKED OVER FOR LONG ENOUGH TO FLATTEN THE BATTERY,
so its extremely unlikely that the contact was actually bad enough to
prevent the battery from being charged. BECAUSE THE CRANKING CURRENT IS
VASTLY HIGHER THAN THE CHARGING CURRENT.

RG> What colour did you say that White picket fence was?

Pathetic really. Still, I guess your brain damage is
so profound that you might well qualify for a disability
pension. Your disability really is obscenely gross.

You even qualify if you have blown you 'brain' away with gross abuse of
whacky weed, or even riding head on into a brick wall without a helmet.

RG> The reason it gets hot is all related to Ohms law...  a bad contact
RG> = high(er) resistance, and for any given amount of current being
RG> drawn this increases the power dissipated by this resistance..
RG> the more power dissipated (ie, the greater the resistance) the
RG> more heat will be generated. A good connection has a theoretical
RG> resistance of zero ohms, meaning no heat will be generated at all.

RS> Pity that no real battery connection is ever like that

RG> Fuckwit..

Cretin..

RG> I said A THEORETICAL RESISTANCE of zero ohms.

You dont say.

RG> I never said that 'real' battery connections are like that.

You dont say. Pity that all real battery connections arent anything
like that and that cranking the engine over for a long time when it
wont start at the very high cranking currents may well produce heat
in a battery connection that isnt actually of high enough resistance
to actually be the cause of his problem, let alone being the cause
of the battery not being charged as Tewwy was claiming.

RG> Heck a straight peice of wire doesn't even have zero resistance

You dont say.

RG> - and as far as I know, nothing on earth does (unless super cooled -
RG> but even then I'm not sure if zero resistance has been achieved)

Watch out you dont go blind now boy.

RS> and that engine cranking current for long enough to flatten
RS> a normal battery may well produced a quite hot terminal,

RG> Regardless how much current is drawn - with a theoretical
RG> resistance of zero Ohms there will be NO heat generated -

Pity thats irrelevant coz there aint no real world
battery connections which have zero resistance.

RG> such is the beauty of super conductors.

Watch out you dont go blind now boy.

RS> even if its nothing special corrosion wise.

RG> With a perfectly clean terminal, with a good contact, the contact
RG> itself would have roughly equal resistance as the earth wire itself -

Mindless drivel on the equal, soorree.

RG> in such a case, even when cranking the starter for a long
RG> time, the terminal would get no hotter than the wire itself

More drivel. Even if the connection was the same resistance as the entire
earth strap, the joules get to heat a much larger amount of metal in the
strap than the terminal, so the temperature rise would be much lower.

RG> - if it does it can only be due to one thing - the
RG> connection has a higher resistance than the actual wire -

Yes, it usually has. Pity that that resistance was clearly still
sufficiently low to allow the engine to be cranked over fine when it
wouldnt start, and it only stopped doing that when the battery was flat.

Pity that if the battery connection was adequate to allow the cranking
currents when attempting to start the engine, it couldnt possibly be
preventing the battery from being charged once the engine starts.

RG> This is dictated by Ohm's law - not Speed's law.

Pity you dont actually have enough viable between your ears to
actually apply Ohms Law to anything but the simplest situations.

Still, thats likely why you ended up just a droid.

RG> Ergo, what I originally told Paul holds true -

Pigs arse it does on Terrys point about the battery charging.

RG> if the terminal gets hot (not the wire) then there
RG> can only be one possible cause - poor contact.

Pity that while the contact may well have enough resistance to get a hot
terminal when you crank the engine over for a long time without it starting
with the very high starter motor currents, that resistance is clearly not
all that high or it would have prevented the starter motor currents from
being used to turn the engine over. And since the charging currents once
the engine has started are MUCH lower, it cant possibly have been the
cause of the battery not charging because of a 'faulty earth contact'

RS> The main flaw in his argument is that while it may well not be as low
RS> a resistance as the other terminal and connection to it, it may well
RS> not have a damned thing to do with the fact that the battery was flat.

RG> I wasn't talking about flat batteries,

Pity that thread was Gaston. Pity you were claiming that the hot
terminal was evidence that the battery connection was bad. Pity
that it obviously cant have been bad if it allowed the engine to
be cranked over for quite a while when the engine wouldnt start.

RG> nor was I discussing the resistance of one terminal compared to the other.

Doesnt actually matter a stuff if you were or were not Gaston.

RG> I was talking about ONE of the two
RG> terminals (and nothing else) getting hot.

Pity you fucked up the significance of it getting hot totally.
You claimed that it was the evidence that there was a 'faulty
earth connection'. Soorree, no evidence that it was 'faulty'

RG> A flat battery won't generate any heat anyway.

That brain damage is getting remarkably florid now boy.

RS> That may well just have been a long time at the massive currents seen
RS> when the starter motor is cranking the engine, with it not starting.

RG> In which case, the entire wire/cable to the
RG> starter motor would get hot, not just the terminal.

Fraid not.
@EOT:

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