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Chris,
I called Steve Roth at Mistral about your injectors. He is the test pilot
who found out what happens when the muffler plugs up. :>) (No "plugs up" pun
intended, but Steve now is right behind Ed with glider time. ) Steve is
looking up to see what part number injectors will fit the intake. He will
get back to me in a couple of days. I will let you know what I find out.
If you are using 550 primaries, I don't know why you don't just use the same
size for the secondaries. That is way more gas than the engine can use and
having them the same size should make it smoother when they stage.
Bill B
-----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
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