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Chris, Dave,
A single injector being out should normally not cause the
engine to stop.
First, the fact that you have no prop load on your engine
means you have even less inertia than normal to keep the engine spinning at
low/idle rpm.
Second, don't waste your time "tuning" the EC2 without a
load - you are simply wasting your time. I can understand you wanting to
play with it (who could resist {:>)), but that is all you are accomplishing
without a prop load.
Third, as many folks have already said there is a safety
margin you are missing without the prop. All it will take is one
unintended blip of the throttle to send the engine and gear box into overspeed
and possibly cause damage or worst yet - injury.
I can idle or fly my 13B with two injectors disable with
absolutely no problem, so while one injector not firing would likely cause some
uneven running and missing, it should not prevent the engine from running under
normal conditions - like with a prop{:>). At most you would simply need
to enrichen the mixture control to compensate for the missing fuel. Again,
the most likely reason yours does not is lack of prop load.
Again, I understand your cautious approach and the thrill
of hearing it purr - but, that said, there is nothing else you can do that is
useful without the prop installed. I guarantee that you will have to
re-tune once you put the prop on. If you are interested in details of
exactly why you need to have load, send me an off-line e
mail.
Also, as best I recall there are two MAP defaults possible
depending on how you have your injector switches positioned when the Power is
turned on and you are holding the store button in to reset the MAP back to
default.
The Controllers will default to Tracy Crook's
Rensesis default mode OR will default to a standard
13B generic map depending on how your injector disable switches are
positioned. My engine ran better (before tuning) with controller B than
A. I think the reason is that with only 260 cc/min primary injectors on
the Renesis compared to my 460 cc/min injectors on the 13B that Tracy's default
is a bit too lean for my engine whereas the standard 13B default on is about
right.
Since you have not had the snubber modification, what
follows are the steps required for getting the default MAp you want on either
controller. The "Sneak Circuit" causes getting the correct default to be a
bit involved:
Selecting EC2 MAP
Default
To select which
of the two possible MAP default modes (Tracy's personal or the generic 13B
default settings) , you want, here are the procedures to follow (this is only
for EC2s that still have the Sneak Circuit i.e. those that do not have the
snubber fix).
To set the 13B generic
MAP default, power to the EC2 and injectors must
be OFF - BUT (BIG BUT!), the injector disable
switches should BOTH be set to ON (the position where
they would normally provide 12V to the injector) (You may need to pull a
CB/fuse to
remove power from your injectors with the injector switches in
the ON
position). Ok, why to you have to do
this?
The reason both injector switches must
be ON (but providing no power to the injectors) is
that If either of your disable switches are turned
OFF while doing this it
grounds the cold start
circuit - and if you reset the controller in this
condition(with the
cold-start circuit grounded) , it resets the MAP default to Tracy Crook's PERSONAL default MAP (i.e for a Renesis
engine with smaller primary injectors)
rather than the generic 13B default
of controller B.
You set the switch to controller A and put the
mode selector to mode "1"
(one). You then push in the program button
and hold it in while you turn
power on to the EC2 controller. Release
program button after 2-3 seconds
and you should have mode A programmed to
its generic 13B default. Same procedures for setting default with/for
controller B selected
The reason you need to remove power from the
injectors or otherwise make
certain there is no 12V to the injectors
(by means OTHER than using the
injector
disable switches) is there is a sneak circuit in the EC2 which can
provide
power to the EC2 through the power feed to the injectors - even
though your
EC2 power switch may be off.
If that configuration exists, then you may think you are holding
the program button before you apply power - but in reality power is already
there and therefore, you will not be
successful in causing the controller to
go into the default MAP mode (for either default setting). Now if you only
have one switch that removes power both to the EC2 AND the
injectors (like
say a MASTER switch) then that is the only switch you need
to worry
about.
So to summarize. If there is any
power to the EC2 either with its switch turned on or through sneak
circuit (if their is power to the injectors) - your EC2 WILL
NOT go into the default reset mode. So ALL power to the EC2 must be off before
you press the store button. Press and hold the Store button and
then turn the power on.
If the cold start circuit is grounded (if either or both
injector switches are OFF) when you set the default, you will get Tracy
Crook's personal default MAP setting. So both injector switches should be
ON (but with CB pulled so they provided no voltage to the injectors) if you want
the generic 13B default MAP.
Hope this helps
----- Original Message -----
Sent: Sunday, June 03, 2007 10:49 PM
Subject: [FlyRotary] Re: Houston, we have a
problem...
> Chris got it
running again today.. and he is 'getting the feel' for the
> engine, and
starting it.
>
> This is still no-load, no instrumentation engine
operation..
> Instrumentation is probably the next focus: EGT on the
exhaust..
> calibrate oil temp and pressure probes, as well as obtaining
fuel
> pressure senders.
>
> May take the radiator drain
fitting out and use that as a temp sensing
> point, or have the radiator
tapped at its discharge point for that
> purposes.
>
>
> Ok....
> What we know:
>
> One of the secondaries
had a poor connection and broken wire inside a
> crimp. This caused an
intermittent power condition within one of the
> secondary fuel
injectors.
>
> This is the only repair made, and starting was
possible after this. This
> is a very concerning failure mode. I will
await Tracy's return to see
> what he thinks..
>
> B runs
smoother than A. The only diff is an intake air temp probe on A
> and
non-temp adjusted values on B.
>
> The EC2, as programmed to
defaults, is somewhat rich in the no-load
> condition of our street
ported (by us) engine. We are getting very good
> results with manual
leaning and estimated revs in the 3-4000 range with
> a closed throttle,
simply by using mixture to control the engine.
>
> None of our runs
have been substantial enough to cause the thermostat to
> open on the
coolant circuit. Engine makes hot oil and hot water, and
> sends the hot
oil through the oil cooling system.
>
> Our RD1-B has oil
circulation, and is warm to the touch from the hot oil
> being circulated
in it. There is minimal to no discernable drainage from
> the aft oil
drain hole on the RD1-B. We have good oil in, and good oil
> out from the
lower/forward drain hole, but none from the upper/aft one.
> I have
aluminum tubing and tube nuts on this run. I will make a short
> "soft
line" for this run, as well as for the oil feed (which is
> currently a
stainless "hard line" run from the stock oil pressure sensor
> port to
the redrive inlet port.
>
> Anyone have any thoughts on the
injector power being a possible point of
> failure? Has anyone else had a
single secondary injector (presumably
> staged) unpowered before and had
a problem?
>
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