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Why use starter contactor?

 
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bob(at)flyboybob.com
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PostPosted: Thu Jan 26, 2006 10:28 am    Post subject: Why use starter contactor? Reply with quote

I am using Z-13/8 as a guide to wiring my electrical system and I do not
understand why it specifies a starter contactor. The starter already has
one so it looks like increased part count which equals reduced relaibility.
I looked in the Connection and all I find is "Typical Starter Contactor
Wiring" on page 11-21. There is no explanation of what function the starter
contactor serves. The archives only gives three hits on "starter contactor"
and they do not answer the question: What is the function of the starter
contacter listed in Z-13/8?

Regards,

Bob Lee
KR-2 N52BL
92% done only 53% to go!


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sportav8r(at)aol.com
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PostPosted: Thu Jan 26, 2006 11:04 am    Post subject: Why use starter contactor? Reply with quote

Bob: its function is to arouse your curiosity so that you'd eventually discover Z-22, and eliminate the extra contactor from your plans; at least, that's what it did for me <g>. Not all starters have these, just the PM types like Sky-Tec.

-Bill B

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nuckollsr(at)cox.net
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PostPosted: Thu Jan 26, 2006 11:10 am    Post subject: Why use starter contactor? Reply with quote

At 01:32 PM 1/26/2006 -0500, you wrote:

Quote:


I am using Z-13/8 as a guide to wiring my electrical system and I do not
understand why it specifies a starter contactor. The starter already has
one so it looks like increased part count which equals reduced relaibility.
I looked in the Connection and all I find is "Typical Starter Contactor
Wiring" on page 11-21. There is no explanation of what function the starter
contactor serves. The archives only gives three hits on "starter contactor"
and they do not answer the question: What is the function of the starter
contacter listed in Z-13/8?

See http://aeroelectric.com/articles/strtctr.pdf

Bob . . .
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >


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sportav8r(at)aol.com
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PostPosted: Thu Jan 26, 2006 12:51 pm    Post subject: Why use starter contactor? Reply with quote

I'm planning to buffer my starter switch, wired per Z-22, through a 30A/40A peak-rated Bosch-style automotive relay; light, cheap (under $2), readily available, supports .25" fast-on terminal technology. Any real downside to that?

-Bill

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nuckollsr(at)cox.net
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PostPosted: Thu Jan 26, 2006 3:00 pm    Post subject: Why use starter contactor? Reply with quote

At 03:50 PM 1/26/2006 -0500, you wrote:

Quote:


I'm planning to buffer my starter switch, wired per Z-22, through a
30A/40A peak-rated Bosch-style automotive relay; light, cheap (under $2),
readily available, supports .25" fast-on terminal technology. Any real
downside to that?

-Bill


That will work too . . .

Bob . . .


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klehman(at)albedo.net
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PostPosted: Thu Jan 26, 2006 3:41 pm    Post subject: Why use starter contactor? Reply with quote

I considered that and then went and bought a 25 amp marine key switch.
I wondered whether such a relay would actually increase the chance of
the starter sticking on?? Most of them don't seem very robust for a 40
amp rating and inductive loads?? Ken

sportav8r(at)aol.com wrote:

Quote:


I'm planning to buffer my starter switch, wired per Z-22, through a 30A/40A peak-rated Bosch-style automotive relay; light, cheap (under $2), readily available, supports .25" fast-on terminal technology. Any real downside to that?

-Bill




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gmcjetpilot(at)yahoo.com
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PostPosted: Fri Jan 27, 2006 4:09 am    Post subject: Why use starter contactor? Reply with quote

>From: "Bob Lee" <bob(at)flyboybob.com>
Quote:
Subject: Why use starter contactor?
>

>The starter already has one so it looks like increased part count
Quote:
which equals reduced reliability. What is the function of the starter
contactor listed in Z-13/8?

There are heavy duty momentary push buttons that go from 15A to
75A. Here are a couple of examples, 15 amp and 50 amp. I think 15
amp switch would work, or go with the 50 amp switch or go with
the small BOSCH relay as Bill sportav8r(at)aol.com suggested:

http://www.philmore-datak.com/Page%20147.pdf
http://www.philmore-datak.com/EDS2.pdf


SkyTec wire diagram with no firewall start contactor
http://www.skytecair.com/Wiring_diag.htm
Note the catch diode.

Leave the FW starter relay off, if you like, I did. The only down side is
that 3-4 foot length of 2-4 AWG is hot all the time the master is on. I
do not think it's an issue and chance of short or fire is small. If you
get in a crash and the engine is ripped off, I don't think the battery
cable will be you only problem. George


---------------------------------


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sportav8r(at)aol.com
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PostPosted: Fri Jan 27, 2006 8:01 am    Post subject: Why use starter contactor? Reply with quote

I don't think the hot wire to the starter is to worry about, since it is controllable via the battery contactor in event of smelling smoke... not perfect protection but at least control.

-Bill B

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BigD(at)DaveMorris.com
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PostPosted: Fri Jan 27, 2006 9:22 am    Post subject: Why use starter contactor? Reply with quote

At 09:59 AM 1/27/2006, you wrote:
Quote:

If you
get in a crash and the engine is ripped off, I don't think the battery
cable will be you only problem. George


It may not be, but it could mean the difference between walking away doused
in gasoline, and walking away on fire, hoping somebody can get to you
quickly enough to put out the flames.

This happened to a friend of mine who would have walked away from a crash
if it had not been for that one little spark. I'm putting a starter
contactor on the firewall to absolutely shut off any possibility of the fat
wire going to the starter chafing against baffling material or anything
else in the event the engine decides to leave its normal upright, and
locked position.

What's a few bucks, guys? My experience with this friend of mine has made
me a believer in steel braided fuel hose, Earl's fittings, Nomex clothing,
and a lot of other things that may cost a few dollars extra, but could
avoid years of skin graft surgery.

Dave Morris


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