Message-Id: <5.1.1.5.2.20040615074412.024bca28@localhost>
Date: Tue, 15 Jun 2004 07:46:35 -0500
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
From: Mark Steitle <msteitle@mail.utexas.edu>
Subject: Re: [FlyRotary] Re: source for LS1 coil harness, $40
In-Reply-To: <list-153001@logan.com>
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Guys,
Why do you even need the main harness connector?  As I see it, it just adds 
three more connections per wire to a flight critical circuit.  The 
connectors are removable at the coils, so why add another?

Mark S.


At 10:05 PM 6/14/2004 -0500, you wrote:
>David,
>
>I think you have the LS1 info below correct.
>
>The mating connector for the GM #12569111 harness is available from GMDirect
>as:
>
>GM PART # 12102754
>CATEGORY: All
>PACK QTY: 1 CORE CHARGE: $0.00
>GM LIST: $50.66
>OUR PRICE: $25.33
>DESCRIPTION: CONN 1-WA
>
>I thought the price was a little steep for half of a connector, so decided
>to go with a 9-pin replacement (Mate-N-Lok), both halves for about $4.  The
>Mate-N-Lok is not weatherproof, but does have "click-lock" closure.  The
>above Weatherpak connector for the LS1 harness is the best for quality and
>waterproofing.
>
>Another option is to use one 4-pin, and one 3-pin weatherpak connector.  The
>supplier below offers for $14.75 +S&H.
>http://www.clewett.com/products/connector.htm
>
>Regards,
>Chris
>
>-----Original Message-----
>From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
>Behalf Of David Carter
>Sent: Monday, June 14, 2004 2:01 PM
>To: Rotary motors in aircraft
>Subject: [FlyRotary] Re: source for LS1 coil harness, $40
>
>
>Chris, Mark, Ed, especially:
>
>The only part of my RV-6 yet to buy is the RX-7 or RX-8 engine, EC-2, and
>fuel and ignition parts.  (I'm working on the tip-up canopy frame at this
>point).  I've been reviewing recent posts re LS1 coils and harness from
>www.gmpartsdirect.com and want a sanity check on what I think I understand:
>
>1)  No question that I'll buy 4 GM coils 12558693 from the above source for
>23.92 ea.
>2)  The harness & connectors:
>......a)  From Chris Sunday 13 Jun:  GM p/n 12569111 is a complete 4 coil
>harness with connectors to coils and another 7 pin connector (only male
>half) to carry wires to-from EC-2 computer.
>......b)  From Chris back on Sep 26, 2003 (starts 2  lines down) it appears
>that one must buy the female half of that 7 pin connector or replace the 7
>pin connector with another connector with both halves.
>----- Original Message -----
>From: "Chris Sargent" <rv7rotary@knology.net>
>To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
>Sent: Friday, September 26, 2003 6:07 PM
>Subject: [FlyRotary] source for LS1 coil harness, $40
>
>
> > Message Some folks have been asking about a source for the GM connectors
>and
> > harness for the LS1 coils.  The link below offers the stock GM coil
>harness,
> > PN 12569111 for $40 + shipping.  Shipping for me was $8.  The source is
> > called GMPartsDirect.com.
> >
> >
>http://www.gmpartsdirect.com/results.cfm?addtocart=1&addpartnumber=12569111&
> > singlepart=1&partnumber=12569111
> >
> > Enter the harness part number in the upper-left search window... 12569111.
> >
> > The local GM parts department recently quoted me $80.50 for the harness
>and
> > $49 for the 7-pin connector that would take it to the EC-2.
> >
> > You don't get the female-half of the 7-pin connector with the harness part
> > above.  I was planning on cutting off the half of the 7-pin connector
> > provided and using an aftermarket, environmentally-sealed 8-pin connector.
> >
> > Chris Sargent
> > Just starting an RV7 for the past 4 years
>- - - - - - - end of quoted msg - - - - -
>continuing my questions/sanity check:
>2) c)  Mark said in his Sunday 13 June e-mail:  <snip> "The GM p/n for the
>connector is 12126487" which comes up on the website as "connector" in
>"category:  chassis wiring and computer controls".
>.........What is this connector?  Is it the female half that Chris said was
>needed to mate to the "harness" in 2a) above?
>
>3)  Spark plug wires between coils and plugs:
>.....a)  These are separate, not included in the above harness - which only
>carries 12v and signals, right?
>.....b)  Ed, on Nov 29, 2002, restated some info from "an RX-7 web site":
>"The object is to keep the resistance to a minimum without creating any
>'noise' which can interfere with some of the computers built into the car.
>The stock wires don't offer much in the name of performance and will
>increase in resistance with age. For upgrades, we offer two types of plugs
>wires; a high performance set suited well for both street and race cars and
>a standard, original equipment style set by NGK."
>.....c) Ed 29 Nov 02 reported rsch & buying custom plug wires:  "I did some
>research on the different types/styles of sparkplug wires (most of it is
>simply market hype).  The company and type wire that I though came through
>with the most credibility was Magnecor (their site lays out the hype of all
>types pretty well).  Their website is ttp://www.magnecor.com  Although they
>advertise a Universal Set (you cut and put the terminals and boots on
>yourself) they really don't encourage people to buy it as they claim that
>cutting and putting terminals and boots on the spiral wrap gnition wires
>correctly takes some tools and a bit of skill.
>
>"They will make you up a custom set quite reasonably (I think).  I got four
>es of specified length and had the sparkplug boots for the leading wires lue
>in color while the sparkplug boots for the trailing wires were black in
>color.  The coil ends I specified as black as I don't pull that end off once
>installed.  The total cost including shipping was$49.61.  You can specify
>whether you want the boots on either end either straight or 90 deg (my plugs
>were 90deg boots and coils ends were straight)
>
>"I specified their 8mm Electrosport 80 Metallic Inductance EMI Suppressed
>Conducts.  There are several other wire types (like for straight-out racing,
>CDI ignitions etc), but I felt that this one was ideal."
>
>....d) Al Gietzen 30 Nov 02 said, "Looks basically the same idea as the MSD
>8.5mm wires.  Best price I found on the MSD wires was at www.sdpc2000.com ."
>
>....e) Al Gietzen said 30 Nov 03:  "I talked directly to the MSD tech rep
>and he offered to send the LS1 ends at no charge, so I could put them on a
>"universal" set from a retailer.  If you are going this route, call MSD at
>915-855-7123 and tell them you need the LS1 coil ends for your wires."
>
>....f)  Rusty then said, "MSD-32829, which is the 8.5mm super conductor wire
>set for a V8 truck [has LS1coil ends].  All the wires are one foot long,
>with works perfectly for me.  This set is red, and was in stock at Summit
>for about $55."
>
>.....g)  Ed reported 25 Aug 03:  "I [now] get between 30 and 50 hours on the
>Stock Mazda plugs running 100LL 99% of the time.  I found out [prviously]
>that having a resistor spark plug wire as well as the resistor plugs
>apparently degrades the spark energy sufficiently to limit me to 20 hours on
>plugs.  However, once I swapped out the resitor plug wire for the "spiral
>wrapped" wire, the life of the plugs appears to have increased.  They don't
>burn up or even become heavily fouled."
>
>End of summary of what appear to be "best practices/best parts" for ignition
>system.  I guess my only question is about the connector to the EC-2
>computer system (2b & 2c way up near top of this e-mail).  Chris, did you go
>ahead and cut off the 7 pin male connector half and put on a sealed 8 pin?
>Have a name and part number and source to suggest?
>
>David Carter
>
>
>
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