[Tigers] Won't Start When Hot

[CoolVT at aol.com]

Appreciate that information.  Now it makes some  sense.  Moral of the 
story....be sure you have a large and clean battery  cable. 
 
 
In a message dated 8/13/2010 2:40:21 P.M. Eastern Daylight Time,  
rfraser at bluefrog.com writes:

Mark
Basically laws of electricity; Volts =  amperage X resistance.  Since
V is mostly a constant for your battery  as Resistance increases you lose
amperage.   With the engine hot  all metals expand and the starter can 
demand
more amperage to overcome that  internal mechanical resistance.  Higher
Resistance in the wire slows  or prevents sufficient amperage reaching the
starter.

As Resistance increases heat at that resistance also increases  and
sometimes to the point where the smoke is let out.  This is bad,  sometimes
very bad.  The amperage is being consumed at the wrong  position when this
happens.   The point here is that for this 12v  system you want to keep
resistance between any of the connections as low as  possible so you get
maximum voltage and amperage delivery to the intended  point.

Ron Fraser

-----Original Message-----
From:  tigers-bounces at autox.team.net [mailto:tigers-bounces at autox.team.net]
On  Behalf Of CoolVT at aol.com
Sent: Friday, August 13, 2010 12:52 PM
To:  tigers at autox.team.net
Subject: [Tigers] Won't Start When  Hot


Thinking of the recent post where a car wouldn't start   when hot, a recent 
tip in Mac's Mustang Parts reads like   this...

"Did you know that battery cables literally wear   out?  Years of 
temperature extremes and exposure to toxic battery  fumes  that leak from 
the
case 
around the battery posts can cause  corrosion to seep up  underneath the 
insulation & wick its way up  into the coper wiring. This of  course,
increases the 
resistance  of the cable which reduces the amount of  voltage that can  
travel

thru the wire to & from the  battery.

This is a  very common cause of car that won't start  when the engine is 
hot  
from being driven. If the battery cables on your   Mustang..........."

Guess I still don't understand the logic of why  it  would affect the car 
more when the engine is hot.

Mark  L
_______________________________________________
Tigers at autox.team.net