Today's Message Index:
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1. 02:34 PM - Won't run without choke (Alan Pinnick)
2. 04:23 PM - Re: Excellent treatise on LOP operation (jetboy)
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| Subject: | Won't run without choke |
I just started up my new 2200A engine (S/N 1798, solid lifters) this
morning, and it will not run without the choke on. It starts fine, runs
smooth, and I can even vary the rpm by moving the throttle. But as soon as
a move the choke in, it cuts right out.
I installed the black floats, and made sure they were adjusted properly.
I've reviewed JSB 018-2, and drilled out the idle circuit inlet to .063".
The idle jet is clear. I've tried adjusting the idle mixture screw to no
avail. All of the idle circuit passages are clear.
There must be something simple that I am missing. Any ideas???
Alan Pinnick
Pulsar XP #473
Message 2
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| Subject: | Re: Excellent treatise on LOP operation |
The fact that Jabiru start leaning below around 70% power does not imply they approve
of running the engine LOP at any time.
The econony jetting never operates in the LOP zone, even the first version which
was savagely lean in some circumstances, did not operate on the lean side of
peak EGT at any throttle setting. (Arguably it would have been better to have
operated LOP than in the "just ROP" danger zone that the initial economy kit
put it) Jabiru since revised the jetting about 4 times to get it safe, according
to the JSB.
I'm just making the point here that LOP means lean of the peak EGT that occurs
while manually leaning the mixture, at the current operating power setting. LOP
operation can be confirmed by applying carb heat and observing an increase
of EGT, rather than the usual decrease, that occurs when the mixture is at or
rich of peak EGT.
its good to see the Aerocarb and Rotec injector carbs being used but won't take
the risk or expense with mine as I've already replaced 4 exhaust valves at 310
hrs and feel a top overhaul is going to occur in a similar time. I would consider
doing it on a new engine once the track record of those engines proven,
but mine's half cut already and I want it reliable for the remainder, theres
enough other issues to be concerned about.
Ralph
[As you noted, different engine manufacturers specify different % power over which
LOP is not good for the engine. Jabiru apparently uses 70% power since the
jet needle they designed for the Bing 94 begins getting much richer at approximately
that power setting, assuming the prop used is within the rpm specs. they
recommend.[/quote]
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Ralph - CH701 / 2200a
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http://forums.matronics.com/viewtopic.php?p=295489#295489
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