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From: "George Lendich" <lendich@aanet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-3678341@logan.com>
Subject: Re: [FlyRotary] Injectors quandary.
Date: Thu, 11 Jun 2009 07:15:55 +1000
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Chris,
If you have a Mistral manifold I would be asking them and then telling us 
what they use.
George (down under)


: [FlyRotary] Injectors quandary.


> The list is WAY too quiet. So, I thought I would pose this 
> concern/question.
>
> I am wanting to get new/rebuilt injectors.  I tried to get some a while 
> back and ordered 4 Mazda injectors.  It was at this time I discovered that 
> the stock Mazda injectors do NOT fit the Mistral intake.  My former build 
> helper originally found the injectors I have been using.  The are 
> seriously mismatched at about 550 cfm and 1600 cfm.  I know the EC2 can 
> compensate (perhaps with some difficulty due to the extreme difference), 
> but I am wanting to replace them all with about 550ish injectors.  Perhaps 
> it will help some of my leaning issues, perhaps not..
>
> I am having a couple of issues.  First, getting the right PHYSICAL size. 
> While the ones I am using in the Mistral Intake look a great deal like the 
> Mazda injectors, they are different in physical dimensions.  The ones I 
> have come back with a Chrysler (Deko) and Ford Part numbers, but seem to 
> be very old part numbers have been difficult to find online (my local auto 
> shop and speed shop has been no help...I seem to know more than they do 
> about the topic even though they did try to help).  Are there "standard" 
> known physical types with some kind of verbiage that will allow me to get 
> the proper fit?  Or do I use my calipers, go for the couple of sets I have 
> found with dimensional drawings, order them and hope for the proper fit? 
> I just do not know the "standards" used and I yet been unable to find the 
> answer online....gee, I may have to resort to live persons in an auto 
> electrical shop <g>.  Some of the injectors seems short and stubby and 
> some long and skinny...some, indistinguishable to the untrained eye, like 
> the different ones I have now.
>
> I know, due to my ignorance, I may be making this harder than it is, but 
> hey, it is part of the learning.
>
> SECOND.  Since I am ordering new injectors anyway, I am curious about the 
> impedance.  The current ones are low impedance.  Thus, I am using the 
> resistors in series with each injector.  I know the EC2 does not seem to 
> mind this at all, however, since I am replacing them, is it wise to remove 
> this minor failure point (the connections to the resistors etc) and buy 
> high impedance injectors and remove the resistors?  Does one have a 
> significant advantage over the other?  Seems if you can reduce the parts 
> count (heh, like in the rotary), it may be better.
>
> Thanks guys.  Hope this helps pick up list activity a bit too.
>
> All the best,
>
> Chris
> Houston
>
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