Message

Ru= sty,

Th= at 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 ? =

Al= so 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.

St= eve 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,<= /p>

<= /p>

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.<= /p>

<= /p>

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. = <= /p>

<= /p>

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. <= /p>

<= /p>

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 = :-)<= /p>

<= /p>

Rusty<= /p>

<= /p>