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> Short Circuit Protection, Between battery and battery cable.
GlennCMC70
post Jan 12 2011, 02:45 AM
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Anyone use something like this between your battery and main battery cable?
I'm sure 150 amps is not enough for a starter motor..... or is it?

http://www.amazon.com/Bussmann-Hi-Amp-Circ...s/dp/B0024JOKM4

I also thought these were interesting too.
http://compare.ebay.com/like/370336644693?...4=263602_309572
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trackbird
post Jan 13 2011, 02:54 AM
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The dyno sheet where MSD tested my MSD mini starter shows that it stalled the starter at (as I remember), 28 NM of torque and 610 amps of current draw. Just adding a data point. I suspect it will draw 100+ (and maybe 250+ in operation), but that is just a guess.
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Mojave
post Jan 13 2011, 05:11 AM
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QUOTE (trackbird @ Jan 12 2011, 08:54 PM) *
The dyno sheet where MSD tested my MSD mini starter shows that it stalled the starter at (as I remember), 28 NM of torque and 610 amps of current draw. Just adding a data point. I suspect it will draw 100+ (and maybe 250+ in operation), but that is just a guess.


There is no such this as a quick blow fuse in the 250 amp range, so even if the starter very briefly draws more, the fuse won't blow.
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trackbird
post Jan 13 2011, 04:22 PM
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QUOTE (Mojave @ Jan 13 2011, 12:11 AM) *
QUOTE (trackbird @ Jan 12 2011, 08:54 PM) *
The dyno sheet where MSD tested my MSD mini starter shows that it stalled the starter at (as I remember), 28 NM of torque and 610 amps of current draw. Just adding a data point. I suspect it will draw 100+ (and maybe 250+ in operation), but that is just a guess.


There is no such this as a quick blow fuse in the 250 amp range, so even if the starter very briefly draws more, the fuse won't blow.


Agreed. Most of the 250 amp fuses will handle 200% for 5 seconds (500 amps). Only if you were to wind up "cranking the crap out of it" due to a no start condition could I ever see you hitting the "duty cycle" and blowing that fuse. I just made the hot lead super short to the solenoid and skipped the fuse. The wire simply isn't hot when it's not cranking. I won't get so much as a spark if that wire grounds out (nice if there was a fuel leak in that crash that had to happen to short the wire in the first place).

How far do we go indeed....
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Posts in this topic
GlennCMC70   Short Circuit Protection   Jan 12 2011, 02:45 AM
GlennCMC70   http://cgi.ebay.com/200-AMP-12V-CIRCUIT-BR...5QQcm...   Jan 12 2011, 02:49 AM
trackbird   That's why I put a starter solenoid (think for...   Jan 12 2011, 03:25 AM
Mojave   On my C4 I used a 250 amp fuse on the cable to my ...   Jan 12 2011, 05:02 AM
cozog   QUOTE (Mojave @ Jan 12 2011, 12:02 AM) On...   Jan 12 2011, 06:27 PM
rocky   QUOTE (GlennCMC70 @ Jan 11 2011, 09:45 PM...   Jan 12 2011, 11:43 AM
GlennCMC70   Thanks guys. Also, you can download a PDF here. ht...   Jan 12 2011, 09:54 PM
85t5mcss   FWIW, most OE starters on SBCs run 70-90 Amp Draw....   Jan 13 2011, 01:12 AM
GlennCMC70   QUOTE (85t5mcss @ Jan 12 2011, 07:12 PM) ...   Jan 13 2011, 02:15 AM
85t5mcss   QUOTE (GlennCMC70 @ Jan 13 2011, 02:15 AM...   Jan 14 2011, 12:49 AM
trackbird   QUOTE (85t5mcss @ Jan 13 2011, 07:49 PM) ...   Jan 14 2011, 12:57 AM
trackbird   The dyno sheet where MSD tested my MSD mini starte...   Jan 13 2011, 02:54 AM
Mojave   QUOTE (trackbird @ Jan 12 2011, 08:54 PM)...   Jan 13 2011, 05:11 AM
trackbird   QUOTE (Mojave @ Jan 13 2011, 12:11 AM) QU...   Jan 13 2011, 04:22 PM
rocky   Every engine is a little different, I think I woul...   Jan 13 2011, 11:27 AM
mitchntx   I'm trying to figure out what were wanting to ...   Jan 13 2011, 12:55 PM
rocky   I would want to do it so if the cable from the bat...   Jan 13 2011, 01:46 PM
mitchntx   OK ... I can see that. So the cable shorting to g...   Jan 13 2011, 02:44 PM
rocky   Mitch good points and I know you know better safe ...   Jan 13 2011, 03:25 PM
mitchntx   Another thing ... and I'm sure I will be corre...   Jan 13 2011, 08:25 PM
Blainefab   QUOTE (mitchntx @ Jan 13 2011, 12:25 PM) ...   Jan 13 2011, 09:40 PM

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