-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Christopher Barber
Sent: Wednesday, June 10, 2009 2:38 PM
To: Rotary motors in aircraft
Subject: [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