flyrotary@lancaironline.net Mailing List Archive

Mark;

You may want to see how well it runs before you go through a lot of work. I have the 550’s in my 20B, and it ran reasonably well on the dyno at idle, although we didn’t spend much time there. The only problem I had was when I pulled the throttle from higher RPM and the MAP went below where I had corrected the mixture table, and it would get too rich and die. I expect that problem will be solved with the EM-2 where I can adjust the mixture at low MAP without operating there. My conclusion was that the Mazda injectors handle very short pulse widths prettywell.

I hope to know more in a few weeks when I have the thing up and running on the airplane.

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle
Sent: Wednesday, July 21, 2004 7:59 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Fuel Rail

Bulent,
You lost me. I did modify the original primary fuel rail by cutting off the ends and welding AN bungs in their place. But that limits me to using the 550cc injectors. I feel these are way too big for a n/a engine. My objective here is to go to a 460cc injector. But they don't come in the "low-profile" style (correct me if I'm wrong). So, I checked and discovered that the the standard injector will fit under my custom intake using a stock 13B fuel rail. I don't see how I could adapt the factory "low-profile" fuel rail to accept standard 460cc injectors. I'll have to take a picture of what I'm talking about when I get home from work. The "low-profile" injector that fits into the primary intake port sockets is fed through a screened opening on the side of the injector. It has o-rings on the body to seal when inserted into the fuel rail. I don't see how you could modify this to accept a standard injector. Also, there are two mounting brackets just next to the injector sockets that holds the fuel rail and injectors in place. I concluded that the easiest solution would be to use two standard 13B primary fuel rails, connecting them in the middle with a tube, than build one from scratch. If push comes to shove I can build one from scratch. A picture will make this much clearer. Stay tuned.

Mark

At 11:00 AM 7/21/2004 -0400, you wrote:

On 7/21/04 10:10 AM, "Russell Duffy" <13brv3@bellsouth.net> wrote:

Anyone that has a 13B fuel rail they're willing to sell,

please contact me at msteitle@mail.utexas.edu.

Thanks,

Mark S.

Mark, my Cosmo 13B has the same injectors as 20B. I cut both ends of the original steel fuel rail and tapped them for 1/4 NPT thread. I m talking about the injectors mounted on the engine block. Can you do that with yours if you have it?
Bulent