Rusty,
That does
seem strange that the smaller injectors produce the same idle results. Are you 100% sure that those are the injectors
that are running at low speed ? Maybe the primary and secondary are reversed
?
Also how
is the fuel pressure ? If it is
too high, maybe it is running very rich on both the large and small injectors. Does you fuel regulator have a MAP
reference so that it reduces fuel pressure at lower power settings ?
My engine
is now running pretty good and idles very well at 1000 RPMs. My only rough spot is somewhere around
1500, it stumbles occasionally.
Mainly when the engine is hot. Now if I could just get my temperatures down another 15
degrees I’d have it made.
Steve
Brooks
-----Original
Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]On Behalf
Of Russell Duffy
Sent: Saturday, June 19, 2004 9:58
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] smaller
injectors, same idle
Greetings,
I tried to
install two ’88 NA injectors that I got from Mazda, but found that the pintle
was too large to fit the plastic parts that are in the block. Rats!!! Otherwise, they're the same size as the 89-91 turbo
injectors I had. Fortunately, I
had the ones that Tommy sent, which are 89-91 NA injectors. These are also 460 cc, but had the oval
plug, rather than the square one that I was trying to end up with. Since the oval plug fits the plugs that
I already have, I installed these 460’s as primaries for now, and tried them
out. My original goal was to
improve idle, and end up with the square plugs that you can get from MSD. I can forget the square plugs for now,
but at least the idle should improve.
Unfortunately,
as far as I can tell there's no difference at all. The idle is the same, and very little
change was made in the map settings.
The only change was at lower throttle, but that actually was a little
off before. Just hard to believe
that it didn’t make any difference. Idle is smooth down to about 1500, which is OK, but lower
would be better.
Also, the B
controller still runs rough at near idle.
This started with the latest intake, and I can't imagine why. I know this is just a tuning thing, but
I’ll be damned if I can make it happy.
Tried copy a to b, default settings, and Tracy’s
settings as a starting point, but no joy.
It’s running fine, except when transitioning to idle, and when trying to
maintain idle. Very odd. This is good enough for a backup
controller, but it bugs me that I can't make it as good as I've had it in the
past.
At this
point, I need to put some hours on this thing, and get out of my experimental
time. I'd be willing to bet that
the airport neighbors are pretty tired of hearing me tuning too :-)
Rusty