Today's Message Index:
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0. 08:25 AM - [PLEASE READ] Why I Have A Fund Raiser... (Matt Dralle)
1. 07:11 AM - Cold Start (BobbyPaulk@comcast.net)
2. 01:08 PM - Re: Cold Start (John Loram)
3. 03:26 PM - Re: Cold Start (FLYaDIVE)
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| Subject: | [PLEASE READ] Why I Have A Fund Raiser... |
Since the beginning, the Matronics List and Forum experience has been free from
advertising. I have been approached by fair number of vendors wanting to tap
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to that.
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Message 1
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Barry
The throttle at the carb is spring loaded to go wide open in case the cable breaks
or comes loose. It is not a strong spring and throttle creep is not a problem
especially with a friction knob.
Also the Jabiru start procedure can not be compared to the Lycoming or Continental.
It has a Constant Velocity Bing Carburetor with a choke. ( no way to prime ). It
also has to be spun about 300 rpm for the magnetic ignition to develop enough
energy to fire the plugs. It does not have impulse couplings. Therefor a cold
soaked or weak battery, cold oil, cold gas ( little vaporization ) makes for
hard starting or not at all. Preheat is about the only option. Al that said I
do believe it should start at 55 to 60 degrees without too much trouble
bobby
Message 2
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Hi Barry:
You're Step #4 (see below) is appropriate for starting the typical Lyc/Cont.
installation, but not for the Jabiru with its standard Bing carby.
A primer is not used with a Bing, nor is there a cockpit mixture control.
The throttle on the Bing must be fully closed to allow the "choke" (actually
a small built-in starting carby) to function properly. Once the engine
starts, the throttle can be advanced and then the "choke" closed. If the
throttle is opened the least bit beyond a slow idle, during a start, the
"choke" will be effectively bypassed and starting will be compromised.
-john-
Jabiru 3300, s/n 102
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of FLYaDIVE
Sent: Thursday, November 20, 2014 7:58 AM
Subject: Re: JabiruEngine-List: Cold Start
Bobby:
The Charger or the Jumper Cables are not the problem. All the battery and
starter have to do is spin the engine and as you said, that is happening.
The fuel on the wheel pant should be your first hint. You are FLOODING the
engine. This statement of course ASSUMES, that everything else is
acceptable...???
Black Smoke is NOT a true indication of a flooded state. Black Smoke is
Carbon and or Oil burning. Also, due to the prop wind and weather wind you
would not see smoke unless you stood out side the plane, focused on the
exhaust pipe and watched as someone else started the plane.
Generally on cold days; usually 32 F and below you need to give one or two
extra primes. But, at 55 F !!! That should not be an issue.
1 - Are you priming?
2 - How much are you priming?
3 - Whoops! Can you prime? I should have asked that first.
4 - Standard start procedure:
> Prime
> Mixture Rich
> Throttle 1/4" in
> Boost Pump - On (Wait till there is a slowing down of the pump)
> Boost Pump - Off
> MAGs - On
> Clear Prop
>>> START
5 - The 1.2 mm drill hole is not much, but if it as been a practice to do
such a hole, then what is needed is more AIR entering the Carb. The small
hole could very well be a Choke/Carb starting issue... Because - And I'm
Guessing - When you start the plane after the first start of the day you Are
Not using the Choke???
Experiment a little... No Choke... A little choke... See what happens.
Barry
On Wed, Nov 19, 2014 at 3:53 PM, <BobbyPaulk@comcast.net> wrote:
Guys
I should have said cold NOT start.
When the outside temp is under 55 degrees my Jab 3300 will not start. I have
tried jumper cables, chargers with 50 amp boost and a new battery. The
engine spins very fast There is spark at the plugs and fuel dripping onto
the nosewheel pant. I even tried starting fluid, choke on, choke off,
throttle cracked, throttle wide open - nothing After about 45 minutes of
this and letting it sit while the battery was recharging I decided to give
it one more try. I tried it ( choke out - throttle closed) and it started
right away as though nothing had been wrong. No flooded black smoke, no miss
firing just a smooth run. Let it run until the oil temp show a small rise
and shut it down. Put the cowl back on and it started immediately with no
jumpers. I was a little apprehensive about leaving the field for a 90 mile
lunch trek but went anyhow - it started right up after sitting on the ramp
for an hour and a half and again when we stopped for a short visit at
another field. It has never failed to start after the first start of the
day. My choke has not been drilled out to the 1.2mm. Could that be part of
the problem. I am also wondering how the fuel got on the wheelpant?? I turn
the key ( mag switch ) off while working on it and back on before spinning
the starter - could it be the switch grounding both coils intermittently.
I have heard of a newer coil for the left side that would allow propping or
at least a lot more spark at a lower start RPM. Has anyone tried it?
Out of ideas.
Bobby ( age 76 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 235 hrs.
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Bobby & John:
Thank you for the learning lesson guys.
I should have realized that there is no prime since there is a choke. I
guess the 1.2 mm hole will be considered more now.
I'm thinking this is to reduce the MP so you don't flood the engine. And
I'm with you Bobby... Those temps should not be a starting problem.
Barry
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