Today's Message Index:
----------------------
1. 06:18 AM - Octane Boosters (BobbyPaulk@comcast.net)
2. 07:42 AM - Fuel injection for the Jabiru (AirEupora)
3. 11:53 AM - Re: Octane Boosters (Mark Hubelbank)
4. 01:41 PM - Re: Fuel injection for the Jabiru (John Loram)
Message 1
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List
I have been running High test 93 Oct. Auto fuel with Ethanol with no problems.
i do not want to leave Ethanol based fuel in the tanks and carby for an extended
periods. I have found a source for 92 Oct. Marine gas ( No Ethanol ) and used
an Octane Booster to get it up a notch. It may run about 6 to 10 degrees cooler
EGT but I really can't tell due to variable and bumpy conditions. It does
not show signs of detonation and I really can not tell any difference in operations.
Has anyone out there had experience with Octane Boosters good or bad. I read a
lot on the internet and get mixed signals. I also have talked to drag racers who
say they can not run without it .
I am still having trouble getting #6 CHT down under 300 deg. all others at cruise
and most power settings run 260 to 290. No. 6 is always 325 to 335. I have
tried tilting the Carb, Installing baffles ( large and trimming 1/16 at a time
) to get the best low temps. I have changed the intake and calibrated the probe.
I have run out of options. I have the smaller cowl intakes and believe there
is just not enough air passing over the cylinders to cool the left side. The
right side 1, 3, & 5 are all under 300 deg.
Comments please.
Bobby ( age 73 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 285 Needle Jet
Status - Flying 146 hrs.
Message 2
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| Subject: | Fuel injection for the Jabiru |
Last week I attended a class for the renewal of my IA. Precision Airmotive LLC
had a class on their fuel injection system. One of the subject was the "Silver
Hawk EX" for Experimental aircraft engines. They said that it will work on the
Jabiru and that they were testing it on a plane in Tenn. They are talking
about Three thousand dollars to install the system. Apparently there is a spring
in the mechanic pump that can be changed out to increase the fuel pressure
to twenty psi. So you have to install a electric fuel pump that will give you
twenty psi. The intake tubes have to be modified to take the injectors. The
injectors need a straight shoot at the intake valve.
http://precisionairmotive.com/
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=368109#368109
Message 3
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| Subject: | Re: Octane Boosters |
Bobby,
I can't say much about octane boosters but I have been using 93
auto fuel (Shell) with ethanol for some time now with no effect. I add
avgas to it for a 5:1 mixture just in case the auto fuel actual Octane
is lower than posted. I also use Sta-Bil which is claimed to help
protect things like fuel tanks as well as lengthen the life of the fuel.
Finally, I keep avgas in one tank and always take off and land with it
so the rest of the system is always filled with Avgas during storage.
Since doing this all signs of spark plug fouling have vanished. It
is clearly a cleaner burning combination than Avgas alone.
If you have access to Avgas, I would suggest using some of it as a
Octane booster.
As for the heat. do you have wheel pants? Since I put them on, it
seems that the CHT's have dropped a bit. When the weather gets warmer, I
will do a more controlled test. I expect this is due to the slightly
higher airspeed for the same power level. I also put insulation on the
exhaust system for other reasons but that also seemed to help slightly,
perhaps it lowers the temp rise of the air going out and thus reduces
the pressure in the lower cowling slightly.
Mark Hubelbank
Ch601XL-B
Jabiru 3300
Sensenich adj prop
Rotec TBI-40-3
201 Hours airframe
On 03/10/2012 9:17 AM, BobbyPaulk@comcast.net wrote:
> List
> I have been running High test 93 Oct. Auto fuel with Ethanol with no
> problems. i do not want to leave Ethanol based fuel in the tanks and
> carby for an extended periods. I have found a source for 92 Oct.
> Marine gas ( No Ethanol ) and used an Octane Booster to get it up a
> notch. It may run about 6 to 10 degrees cooler EGT but I really can't
> tell due to variable and bumpy conditions. It does not show signs of
> detonation and I really can not tell any difference in operations.
> Has anyone out there had experience with Octane Boosters good or bad.
> I read a lot on the internet and get mixed signals. I also have talked
> to drag racers who say they can not run without it .
> I am still having trouble getting #6 CHT down under 300 deg. all
> others at cruise and most power settings run 260 to 290. No. 6 is
> always 325 to 335. I have tried tilting the Carb, Installing baffles (
> large and trimming 1/16 at a time ) to get the best low temps. I have
> changed the intake and calibrated the probe. I have run out of
> options. I have the smaller cowl intakes and believe there is just not
> enough air passing over the cylinders to cool the left side. The right
> side 1, 3, & 5 are all under 300 deg.
>
> Comments please.
>
> Bobby ( age 73 )
> Zodiac 601 XL "B"
> Jabiru 3300 S/N 1141
> Sensenich 64" x 51" Prop
> Bing Carb 260 Main & 285 Needle Jet
> Status - Flying 146 hrs.
>
> *
>
>
> *
--
Mark Hubelbank
NorthEast Monitoring
2 Clock Tower Place
Suite 555
Maynard, MA, 01754 - USA
mhubel@nemon.com
978-443-3955
Message 4
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| Subject: | Fuel injection for the Jabiru |
A plane in Tennessee, you say? I wonder who would in Tennessee would qualify
to participate in the development of a Jabiru FI system.
I was guessing it was going to be the South African system, but I confess to
a preference for the simpler mechanical approach. I guess I spent too many
years as an EE to trust an electronic system.
;-)
-john-
> -----Original Message-----
> From: owner-jabiruengine-list-server@matronics.com
> [mailto:owner-jabiruengine-list-server@matronics.com] On
> Behalf Of AirEupora
> Sent: Saturday, March 10, 2012 7:38 AM
> To: jabiruengine-list@matronics.com
> Subject: JabiruEngine-List: Fuel injection for the Jabiru
>
> --> <AirEupora@sbcglobal.net>
>
> Last week I attended a class for the renewal of my IA.
> Precision Airmotive LLC had a class on their fuel injection
> system. One of the subject was the "Silver Hawk EX" for
> Experimental aircraft engines. They said that it will work on
> the Jabiru and that they were testing it on a plane in Tenn.
> They are talking about Three thousand dollars to install the
> system. Apparently there is a spring in the mechanic pump
> that can be changed out to increase the fuel pressure to
> twenty psi. So you have to install a electric fuel pump that
> will give you twenty psi. The intake tubes have to be
> modified to take the injectors. The injectors need a
> straight shoot at the intake valve.
>
> http://precisionairmotive.com/
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=368109#368109
>
>
>
>
>
>
>
> Photoshare, and much much more:
>
>
>
>
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