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From: "John Downing" <downing.j@sbcglobal.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1488854@logan.com>
Subject: Re: [FlyRotary] Re: Injector Switches !!! was  Re: Powering fuel injectors
Date: Fri, 20 Oct 2006 13:24:12 -0400
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Greg;  If the CB's are to only be 6" to 1' from the battery, there are alot
of old Pipers flying with the battery behind the seats and the CB;s on the
panel, which have a condition.  My Tri-Pacer is 45 years old and it does not
know the difference.  JohnD
----- Original Message ----- 
From: "Greg" <greg@itmack.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, October 20, 2006 9:55 AM
Subject: [FlyRotary] Re: Injector Switches !!! was Re: Powering fuel
injectors


> Thanks for that Ed,  I am using the EC2 but I hadn't gone through the
> install of it thoroughly yet and wasn't aware of that mode.  I'll make
sure
> that it's done now.
>
> I follow what you're saying about breakers instead of fuses and I have to
> agree,  but following the Bob Nuckolls school of wiring means that the
> fuses/breakers should be no more than 6" to a foot from the power source
> (battery) and the batteries are behind the rear baggage area and no where
> near the panel.  The argument for the fuses to be near the source of
> electric power is also valid considering the fuses are there to protect
the
> wiring.
>
> Greg
>
>
> > Hi Greg,
> >
> > Looks like a good electrical system over all.      However, I would not
> > feel comfortable with fuses in my critical system power line.  But, I
see
> > that you are routing two power sources to each switch of your critical
> > system which means if one fuse blows due to a transit spike, the other
> > one, hopefully, will not.  Again, this is my own personal bias against
> > fuses in critical systems - there are arguments to the contrary for
sure.
> >
> > One thing I did notice, is looking at your injector power switches, I am
> > not certain if these are meant to be the same as Tracy Crook's Injector
> > disable switches.  If they are (and they may not be), I do not see the
> > connection that automatically grounds the "cold Start" mode in the EC2
> > when either injector pair are disabled (turned off).
> >
> >  This may be a detail just not shown on the drawing - but it is
crucially
> > important.  If the injector power switch does not have the "cold start"
> > grounding provision, then if you ever switch off one of the injector
> > pairs, your fuel flow will drop approx by 1/2 half.  The reason is that
> > (with Tracy's recommended switch set up) when you turn off one pair of
> > injectors , that automatically grounds the "cold start" pin  which
causes
> > the EC2 to double the duration of the PW (Pulse Width) signal to the
> > remaining injector pair.  This in turn doubles the amount of fuel from
the
> > active pair of injectors.  If the "cold start" is not activated (by
> > automatic grounding of the cold start pin through a DPDT switch) when an
> > injector pair is switched off,  then the PW signal does NOT double and
the
> > fuel flow through the one injector pair will only be 1/2 of what the
> > engine needs.
> >
> >
> > Ed
> >
> > Ed Anderson
> > Rv-6A N494BW Rotary Powered
> > Matthews, NC
> > eanderson@carolina.rr.com
> > http://members.cox.net/rogersda/rotary/configs.htm#N494BW
> > http://www.dmack.net/mazda/index.html
> >
> > ----- Original Message ----- 
> > From: "Greg@itmack" <greg@itmack.com>
> > To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> > Sent: Friday, October 20, 2006 3:33 AM
> > Subject: [FlyRotary] Re: Powering fuel injectors
> >
> >
> >> I'm trying to keep the number of switched down as well,  I attached a
pdf
> >> with my schematic which is a work in progress for your review.
> >>
> >> I have noted that a lot of builders reduce a lot of this complexity by
> >> just
> >> hanging everything off 1 or 2 fuses which is fine until a fuse blows
and
> >> then everything stops.
> >>
> >> Greg RV8 down under
> >>
> >>
> >>
> >>>I am using Z-19 from the Aeroelectric Connection as a guide for wiring
> >>> my plane.  I would like to power the injectors from the battery buss.
> >>> Looking at Z-19, do I need to install a complete switch and diode
system
> >>> for the injectors like is done for the fuel pump and ECU, or can I tie
> >>> on to the fuel pump OR the ECU system after either the switch (add a
> >>> separate diode) or after one of the diodes?
> >>> There will be the two DPDT switches to disable the primary and
secondary
> >>> injectors after this connection.
> >>> My panel is becoming somewhat switch festooned and I would like to
keep
> >>> more switches to a minimum.
> >>> How have you guys accomplished this?
> >>>
> >>> Thanks.
> >>> Bill B
> >>>
> >>>
> >>> --
> >>> Homepage:  http://www.flyrotary.com/
> >>> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
> >>>
> >>>
> >>
> >
> >
>
> --------------------------------------------------------------------------
------
> >
> >
> >> --
> >> Homepage:  http://www.flyrotary.com/
> >> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
> >>
> >
> >
> >
> > --
> > Homepage:  http://www.flyrotary.com/
> > Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
> >
> >
>
>
> --
> Homepage:  http://www.flyrotary.com/
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