Today's Message Index:
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1. 01:16 AM - Re: JabiruEngine-List Digest: 0 Msgs - 12/02/06 (E.T.Gmerek)
2. 06:47 AM - Re: Re: JabiruEngine-List Digest: 0 Msgs - 12/02/06 (rick tedford)
3. 06:54 PM - Fw: Jabiru Starter contactor and solenoid (Matt & Jo)
4. 08:11 PM - Re: Fw: Jabiru Starter contactor and solenoid (Paul Mulwitz)
Message 1
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| Subject: | RE: JabiruEngine-List Digest: 0 Msgs - 12/02/06 |
I'm new to the Jabiru Engine list, and have just acquired a 601 XL with
a 3300A Jabiru Engine, Serial # 33A641. The plane still has 14 hours of
its mandated 40 to be flown off in the Houston, TX, area. Can other
XL/Jabiru 3300A owners give me an idea of their CHTs? This airplane is
showing 366F on the number 6 cylinder, Grand Rapids EIS. The builder
added the carburetor economy change. The plane has the standard
Zenith/Jabiru FWF cowling and 'air leaks' have been plugged with foam.
It has the carbon Sensenich prop. The high temp does not occur during
climb out but when throttled back to ~2750 and also does not cool down
on descent/approach for landing. As I am about 1500 miles from the plane
at this time, I retained an A&P to attempt to resolve the issue through
baffling. The previous owner/builder tried relocating the carburetor
slightly at the suggestion of Jabiru, and has played with baffling to no
avail. I am aware that at approximately 26 to 30 hours run time that the
engine may not be fully broken in. Oil change and re-torque of the heads
occurred at 25 hours. I would appreciate any information XL/Jab owners
might have regarding their maximum CHT temps, especially #6.
Along the same line, have any 3300A owners gone to an AeroCarb over the
Bing for mixture control/lower EGT/CHT Temps?
Thanks,
Ed
Message 2
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| Subject: | Re: RE: JabiruEngine-List Digest: 0 Msgs - 12/02/06 |
Hello ET : I had similar problems , but , when I purchased the cowl from
JabUSA my cht,s went down substantially . I now run at about 250F.on #6 and
with very little variation on the others .
My original cowl came from Aus.and I was not happy with same .
Hope this helps
Rick
DO NOT ARCHIVE
----- Original Message -----
From: "E.T.Gmerek" <jptook@jptook.cnc.net>
Sent: Wednesday, December 06, 2006 4:15 AM
Subject: JabiruEngine-List: RE: JabiruEngine-List Digest: 0 Msgs - 12/02/06
> <jptook@jptook.cnc.net>
>
>
> I'm new to the Jabiru Engine list, and have just acquired a 601 XL with
> a 3300A Jabiru Engine, Serial # 33A641. The plane still has 14 hours of
> its mandated 40 to be flown off in the Houston, TX, area. Can other
> XL/Jabiru 3300A owners give me an idea of their CHTs? This airplane is
> showing 366F on the number 6 cylinder, Grand Rapids EIS. The builder
> added the carburetor economy change. The plane has the standard
> Zenith/Jabiru FWF cowling and 'air leaks' have been plugged with foam.
> It has the carbon Sensenich prop. The high temp does not occur during
> climb out but when throttled back to ~2750 and also does not cool down
> on descent/approach for landing. As I am about 1500 miles from the plane
> at this time, I retained an A&P to attempt to resolve the issue through
> baffling. The previous owner/builder tried relocating the carburetor
> slightly at the suggestion of Jabiru, and has played with baffling to no
> avail. I am aware that at approximately 26 to 30 hours run time that the
> engine may not be fully broken in. Oil change and re-torque of the heads
> occurred at 25 hours. I would appreciate any information XL/Jab owners
> might have regarding their maximum CHT temps, especially #6.
>
> Along the same line, have any 3300A owners gone to an AeroCarb over the
> Bing for mixture control/lower EGT/CHT Temps?
>
> Thanks,
> Ed
>
>
> --
> 11:50 AM
>
>
Message 3
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| Subject: | Fw: Jabiru Starter contactor and solenoid |
I have a Jabiru 3300 and have a 702-1 starter contactor from B&C. I
have a question about the solenoid supplied with the Jabiru. I am
considering just hooking up the 702-1 contactor directly to the starter.
It looks like the "solenoid" supplied by Jabiru is really just another
contactor. It is wired and works the same as the 702-1 but with out the
diode. I am planning on hooking up the contactor similar to what is
depicted in aeroelectric Z-20. There it has the lead off of the 702-1
contactor hooked to the Jabiru solenoid. It sure looks to me that all
I will be doing is putting two contactors in series. I am not sure of
the value in this. I am considering just leaving off the Jabiru
solenoid and connecting the 702-1 directly to the starter.
Is this smart or is there something I am missing?
Thanks
Matt
www.zodiacxl.com
Message 4
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| Subject: | Re: Fw: Jabiru Starter contactor and solenoid |
Hi Matt,
I'm no expert on Jabiru or engines in general, but I was an
electrical engineer for many years. So, take my suggestion as a
starting point rather than a final word . . .
I think the point of the battery contactor on an airplane is to shut
down all electrical power for fire prevention (well, almost
prevention) in case of a forced landing. It is also nice for
stopping an electrical fire.
The starter solenoid (technically, it is a relay since its purpose is
to switch electricity rather than perform a mechanical function) is
in place to allow switching of the huge current needed to start the
engine. You will not find a panel mounted switch that will switch
more than 20 or 30 amps, and I think starters can use more like 100
amps. So the way to think of the starter solenoid is to consider it
a switch extension for the starter current.
These are two completely different functions that cannot be combined
in one switch. I would suggest the "Battery Master" contactor be
installed near the battery (wherever it winds up being
installed. The starter solenoid should be installed with either a
separate cable to the battery or to the master contactor output. It
shouldn't matter if it is directly connected to the battery since it
won't get any power unless the starter swtich on the instrument panel
is activated. Similarly, it can work through the master contactor
just as well as with a direct battery connection. The difference
will only be really noticeable if you have to run an additional heavy
cable from the engine compartment to the battery if it is installed
in the rear portion of the plane.
If you study the specifications for both of these components you will
probably find the starter solenoid is only meant to be turned on for
short periods while the master contactor is meant to be turned on for
many hours at a time. These are not interchangeable parts.
If my guess is correct, the diode is meant to clamp the coil on the
solenoid. This prevents the natural tendency of any coil to increase
its voltage in attempt to continue current flow when the circuit is
opened. The diode will prevent high voltage (perhaps very high
voltage) from appearing on the battery circuit when the starter is
turned off. Some planes are equipped with an "Avionics Master"
switch which also deals with this kind of problem, but the diode is a
lot smaller and less expensive to install. I would recommend putting
power diodes on both solenoid/contactors. They are installed to be
inactive when power is applied for normal function between the two
sides of the coil.
Good luck,
Paul
Still working on airframe - engine to follow soon . . .
At 06:54 PM 12/6/2006, you wrote:
>
>I have a Jabiru 3300 and have a 702-1 starter contactor from B&C. I
>have a question about the solenoid supplied with the Jabiru. I am
>considering just hooking up the 702-1 contactor directly to the
>starter. It looks like the "solenoid" supplied by Jabiru is really
>just another contactor. It is wired and works the same as the 702-1
>but with out the diode. I am planning on hooking up the contactor
>similar to what is depicted in aeroelectric Z-20. There it has the
>lead off of the 702-1 contactor hooked to the Jabiru solenoid. It
>sure looks to me that all I will be doing is putting two contactors
>in series. I am not sure of the value in this. I am considering
>just leaving off the Jabiru solenoid and connecting the 702-1
>directly to the starter.
>
>Is this smart or is there something I am missing?
>
>Thanks
>Matt
><http://www.zodiacxl.com>www.zodiacxl.com
---------------------------------------------
Paul Mulwitz
32013 NE Dial Road
Camas, WA 98607
---------------------------------------------
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