flyadive(at)gmail.com
Guest
|
 Posted: Fri Oct 01, 2010 4:31 am Post subject: AMP? |
 |
|
Dan:
Your wire runs are nice and short. That is in your favor.
But! Don't ya just hate it... There is always a BUT, some times a BUTT!
The gage of your wire is small.
Why do I say that? In the winter you can draw around 250 to 350 AMPS during cranking.
Cold weather puts a heave load on your engine.
In the summer the draw is probably 100 to 150 AMPS.
These numbers vary with Temperature & Engine Compression as well as wire run lengths.
Below is a chart that shows AWG Vs AMP.
http://wiki.xtronics.com/index.php/Wire-Gauge_Ampacity
You will notice that even for a mer 100 AMP draw you should be using 2 AWG.
Now if you LQQK at the chart, 6 AWG does have a 101 AMP rating in free air.
AND some may argue that a single run of wire going to the contactor ( I like that term) and then the starter IS IN FREE AIR.
BUT! What about the HEAT from the engine in the summer after a flight?
I know, I know I'm getting nit picky ... And your next question is:
# 2 AWG STILL does not cover the 250 to 350 AMPS you mentioned for cranking.
TRUE! AND neither does your contactor... What you are betting on is the SHORT time (10 Seconds Max.and that is too long) the system will be activated.
SOoooo, long story short. Go to the larger AWG and don't be boarder line.
I fully understand the additional cost and time acquiring the parts.
One other option would be to run multiple lengths of the # 6 ... But, there you will have problems fitting the stack of lugs on the terminals as well as the difficulty in routing the stiff wire bundle. And I would bet the weight would be more than a single run or # 2.
Remember # 2 is minimum.
Barry
[quote][b]
| | - The Matronics Zenith-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith-List |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
