[Tigers] Does it CRANK?

[Lynn Wall]

Two additional thoughts:

First:
I suggested in my last post that A/F mixture can add to starting difficulty,
although remote.  An extreme lean condition can cause predetonation making
cranking difficult.  I had that occur to me in a Chevy 283 I ran in high
school.  This is the only time I have seen it.

Second:
To Theo's point as well.  Conductor size of the battery cable combined with
the heat, terminal cleanliness,  and other starting circuit issues
previously mentioned can SEVERELY compromise the starting ability.  This is
what I believe is Owain's problem.

By the way, I just got snow at my house.

Lynn (Veteran snow farmer)


-----Original Message-----
From: tigers-bounces at autox.team.net [mailto:tigers-bounces at autox.team.net]
On Behalf Of Smit, Theo
Sent: Wednesday, September 30, 2009 11:45 AM
To: owain.lloyd at gmail.com
Cc: TIGERS at autox.team.net
Subject: Re: [Tigers] Does it CRANK?

It was pointed out to me a while ago that copper has a pretty serious
temperature coefficient of resistance - 0.3 percent per degree C. What
that means is that if the starter gets baked to 100 degrees C (the
boiling point of water) it would have 30 percent more internal
resistance compared to being at 0 C. This doesn't reduce the power
output by 30 percent but it does reduce the stall torque limit by about
that much. On the other hand, it would be quite possible for a motor to
heat-soak to a significantly higher temperature, with consequently
greater resistive loss. The copper wiring in the engine compartment is
similarly affected, so if you start with a poor connection and add to it
a bunch of copper loss, you can go to a no-start or even a no-crank
condition.

Theo
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