Yes I am using Tracy 2/4 injectors system.
   Up until MAP 15" Hg Tracy fires only two injectors. After MAP 15" Hg
   Tracy
   backs off the pulse width of the first two injectors and brings
   the next two injectors on line with a pulse width calculated for all
   four injectors
   to provide the same amount of fuel. After MAP 15" Hg both sets of
   two injectors
   are the same pulse width and are increased as the manifold air
   pressure continues
   to rise. I am in the process of changing the rate, on the test
   bench, these pulse
   widths are increased to richen the mixture on the top end.

   Paul Lamar

Paul,
Did you ever try running the hose in only one tube? That does sound
obvious, but I was thinking of the consequences of the teed line. The
alternate pulses could be causing a low vacuum at idle due to
reflections in the alternate pipes. Perhaps a single tap with a small
accumulator chamber to even the draw? FWIW
Bill Jepson

No we did not. Not yet. I am thinking about it.
I discussed it with Tracy but we came to no conclusion on the matter.
We need some more understanding about exactly when the high pressure
pulse arrives at the spot in the runners where the pressure taps
are. Marc Pedings made some good suggestions. Also there are some
questions in my mind exactly when Tracy samples the pressure data
relative to the ignition pulse in terms of degrees of e-shaft
rotation. My guess is this number varies greatly as the computer
(in terms of instructions per second) is running at a constant
speed while the RPM and consequently the length of time it
takes the pulse to arrive at the pressure tap also varies greatly.

Paul Lamar

The Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Copyright 1998-2005 All world wide rights reserved.