Received-SPF: softfail
 receiver=logan.com; client-ip=216.240.18.37; envelope-from=echristley@nc.rr.com
Message-ID: <4DF13090.5050502@nc.rr.com>
Date: Thu, 09 Jun 2011 16:44:00 -0400
From: Ernest Christley <echristley@nc.rr.com>
Reply-To: echristley@nc.rr.com
User-Agent: Thunderbird 2.0.0.24 (X11/20100623)
MIME-Version: 1.0
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: CAS sensors
References: <list-5015581@logan.com>
In-Reply-To: <list-5015581@logan.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

josrph berki wrote:
> Thanks Ernest,
>
> I have a 2nd gen P Port that needs EFI and ignition and MS 2 with the latest
> SW should work.  I do not have the luxury of using the 2nd gen CAS as it is
> in the way of the v belts for the remote water pump and alternator.  I have
> to come up with a trigger wheel on the E shaft.  I plan on using 4 RX-8
> yellow injectors and maybe Kurt stage them.  I have downloaded the software
> on to a laptop with windoz XP.  I like the redundancy of the EDIS but
> without a fuel backup I feel it might be useless.  EZs are midwing and I
> lose fuel pump when the power goes out.  Will have dual batteries and
> essential bus and appropriate switching.  I have not purchased any of the
> EFI or ignition parts yet and just trying to understand what options are out
> there
>   

There is a picture on the rx7club.com forum where one builder built a 
trigger wheel into a pulley.  He reported good results.  At the most 
basic, the trigger wheel is nothing more than a circular steel object 
with saw teeth cut into it.  In fact, a properly cut skill-saw blade 
could be fitted under the stock pulleys, then the alternator shimmed out 
with washers, and the waterpump shimmed out with a piece of cut aluminum 
sheet.

Conflating the redundancy of fuel and redundancy of spark confuses the 
issue.  Both have very long failure paths that do not cross the other, 
and they meet at the MS.  Improving one path may give you only half the 
benefit, but I'll take a half-loaf over starving any day. 

If I had to do it over again, I'd definitely go plugs up.  Ignoring a 
host of other benefits, for a mid-wing tank, this would make it easy to 
put your throttle body low enough to get gravity feed.