Mailing List flyrotary@lancaironline.net Message #12036
From: Jarrett Johnson <jjjohnson@accesscomm.ca>
Subject: Re: [FlyRotary] Re: Low power 20B operation
Date: Fri, 8 Oct 2004 13:11:00 -0600
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Al where are you getting your fuel for your installation?  Is it possible if your running out of the a/c tanks for the first time that there was some dust contamination or something of that nature [ possibly in the lines] that would plug or foul the injectors?
 
Jarrett Johnson
 
----- Original Message -----
From: Al Gietzen
Sent: Thursday, October 07, 2004 9:24 AM
Subject: [FlyRotary] Re: Low power 20B operation

 

Al,
You may have answered this already, but have you checked the injector spray patterns?  It is possible that they "click" ok while the fuel orifices are plugged with some gunk.  I took mine and safety wired them to the injector manifold, hooked up a fuel supply, hit them with 12v and observed the spray patterns.  Probably a waste of time, but it would tell you that you're getting a good mix of fuel into each chamber.

Mark;

No I haven’t tested them myself, but sent them off the RC Engineering who cleaned, flow tested and checked the pattern.  There has just been a few hours on the dyno and on the plane, but that doesn’t mean there couldn’t be something in there, although there is a 20 micron filter in the line.  First I need to eliminate any electronic issues.  I’m not sure the pattern is of that much concern on the primary; there is that little plastic deflector below the injector.  I don’t know if the fuel actually sprays on that, or if it just causes some turbulence in the runner right there for better mixing.

BTW, Initially I had incorrectly wired my injector relay.  It took me a while to figure out what I had done wrong and correct it.  I got it wired correctly now... I think.

So did I, but caught that in the first runs on the dyno.

Al

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