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Auto fuel

 
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BobbyPaulk(at)comcast.net
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PostPosted: Sat Jul 15, 2017 3:06 am    Post subject: Auto fuel Reply with quote

American Auto fuel is NOT high enough Octane for the Jabiru.

I was using 92 Oct. Non Ethanol Marine fuel with an Octane booster.
The booster would break down unless it was used quickly.
The engine requires 95 Oct RON which is about 3 points higher than 95 Oct.MON ( American Rating ).
Using Auto fuel in a high compression engine will cause detonation.

Also most Bing carburetors lean the mixture between 2500 and 2800 RPM.
Watch your EGT and CHT. I am running a 260 main jet and 290 plus .002 Needle jet and I still can not operate in those RPM ranges.

Bobby ( age 79 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Plus .002 Needle Jet
Status - Flying 280 hrs.
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dringoli(at)morrisbb.net
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PostPosted: Sat Jul 15, 2017 12:54 pm    Post subject: Auto fuel Reply with quote

The American system is AKI (antiknock index) and is listed on the pumps . The Australian system is RON (research octane number ) . According to the published conversion charts RON x .95 = AKI .
So the requirement of 95 RON from Jabiru equates to 90 AKI . Ethanol free high test has a 93 AKI rating which is well above the requirement for the engine . Regular 87 AKI and mid grade 89 AKI are NOT suitable for the engine .

Leo Dringoli
Corby Starlet
Jabiru 2200

From: BobbyPaulk(at)comcast.net
Sent: Saturday, July 15, 2017 7:06 AM
To: Server, JabiruEngine-List Digest
Subject: Auto fuel


American Auto fuel is NOT high enough Octane for the Jabiru.

I was using 92 Oct. Non Ethanol Marine fuel with an Octane booster.
The booster would break down unless it was used quickly.
The engine requires 95 Oct RON which is about 3 points higher than 95 Oct.MON ( American Rating ).
Using Auto fuel in a high compression engine will cause detonation.

Also most Bing carburetors lean the mixture between 2500 and 2800 RPM.
Watch your EGT and CHT. I am running a 260 main jet and 290 plus .002 Needle jet and I still can not operate in those RPM ranges.



Bobby ( age 79 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Plus .002 Needle Jet
Status - Flying 280 hrs.

Do Not Archive


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BobbyPaulk(at)comcast.net
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PostPosted: Sun Jul 16, 2017 5:18 am    Post subject: Auto Fuel Reply with quote

Sorry I had the Ron and AKI ratings reversed.

It's an age thing.

Still the engine runs a lot better on 100LL Av gas.

bobby


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zeprep251(at)aol.com
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PostPosted: Sun Jul 16, 2017 5:55 am    Post subject: Auto fuel Reply with quote

I agree completely with Bobby,mostly because I do not trust the oil companies to maintain quality control with such a narrow margin to play with.Nothing but 100LL in my 2200A S/N1295 1030 hrs G.Aman( same age as Bobby)
Quote:
On Jul 15, 2017, at 7:06 AM, BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net) wrote:
American Auto fuel is NOT high enough Octane for the Jabiru.
I was using 92 Oct. Non Ethanol Marine fuel with an Octane booster.
The booster would break down unless it was used quickly.
The engine requires 95 Oct RON which is about 3 points higher than 95 Oct.MON ( American Rating ).
Using Auto fuel in a high compression engine will cause detonation.
Also most Bing carburetors lean the mixture between 2500 and 2800 RPM.
Watch your EGT and CHT. I am running a 260 main jet and 290 plus .002 Needle jet and I still can not operate in those RPM ranges.
Bobby ( age 79 )Zodiac 601 XL "B"Jabiru 3300 S/N 1141Sensenich 64" x 51" PropBing Carb 260 Main & 290 Plus .002 Needle JetStatus - Flying 280 hrs.
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rpf(at)wi.rr.com
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PostPosted: Mon Jul 17, 2017 5:24 am    Post subject: Auto Fuel Reply with quote

I put 1200 hours on my Jabiru 3300 and now 300 on my Camit 3300 using auto gas(with the occasional use of 100LL when away from my home airport) both engines have run fantastic.

Randy

From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of BobbyPaulk(at)comcast.net
Sent: Sunday, July 16, 2017 8:18 AM
To: Server, JabiruEngine-List Digest
Subject: Auto Fuel



Sorry I had the Ron and AKI ratings reversed.

It's an age thing.

Still the engine runs a lot better on 100LL Av gas.



bobby


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matronics(at)rtist.nl
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PostPosted: Mon Jul 17, 2017 5:38 am    Post subject: Auto Fuel Reply with quote

Not as many hours, but same sequence (Jabiru, then CAMit), same fuel (always mogas, except when not avbl), and same result (runs great).

Rob

On 7/17/2017 3:23 PM, Randy wrote:

Quote:
<![endif]--> <![endif]-->
I put 1200 hours on my Jabiru 3300 and now 300 on my Camit 3300 using auto gas(with the occasional use of 100LL when away from my home airport) both engines have run fantastic.
 
Randy
 
From: owner-jabiruengine-list-server(at)matronics.com (owner-jabiruengine-list-server(at)matronics.com) [mailto:owner-jabiruengine-list-server(at)matronics.com (owner-jabiruengine-list-server(at)matronics.com)] On Behalf Of BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net)
Sent: Sunday, July 16, 2017 8:18 AM
To: Server, JabiruEngine-List Digest
Subject: Auto Fuel


 
Sorry I had the Ron and AKI ratings reversed.

It's an age thing.

Still the engine runs a lot better on 100LL Av gas.

 

bobby

 




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