Yes Doc Hodges knew his stuff. Now where do I get a Hodges fuel volatility
tester.
Nige.
From: Ian Mc Phee
Sent: Saturday, November 22, 2014 7:44 AM
To: DOG LIST
Subject: Re: [DOG mailing list] Urgent - Fuel and detonation
To DOGs and other 2/4 stroke aviation users
This fuel quality issue is so interesting. Years ago Bruce Taylor at 3500ft
ASL suspected poor auto fuel was his issue so he got some guess 2 year old
Avgas and it burst into life. We did a bit of research with help of Dave
Sharples and did find there is City 98 has tricks done on it like butane
bubbled through it but that fuel should only go out only to city outlets (not
country) and be used up quickly. Each time this 98 fuel goes up and down in a
tug say it looses its octane rating and could easily become 95 and city fuel
can come to country NSW in error.
I also bring your attention to a Jabiru SB on fuels and in particular Shell 98
(also Liberty in our area) and in parts of SA I notice Liberty deliver to Shell
service station. Jabiru say use Shell 95 or Avgas. They say DO NOT USE Shell
98 in fibreglass tanks and they are currently using large amounts Toluene in
their fuel. That fuel turns clear plastic fuel lines very dark brown in a
matter of weeks (Arcus in LHS of rear seat and early motorfalkes with clear
sight tube for fuel and that is with clear tube from Germany factories marked
for use with Oil/Gas in German). Rob Hanbury in WA reports toluene in WA fuel
As far as I remember Dr Hodges who issues the STC to use auto fuels in
Tugs/Cessna etc supplies a volatility tester. A local now RAA pilot used this
device to test local BP fuel which he suspected. He reported his results to BP
and they checked their records and records from the ex Italian who owned the 6
local BP outlets. All BPs were closed for 24 hours BP took over deliveries and
forced him to sell off all his service stations. It all went to court and think
he and his son (tanker driver in middle of night) may have spent time at Glen
Innes as a guest of state. He did give $250K to a local charity for young
people before the court case.
By the way if registered for GST a club can claim back think 37c/lit tax back
for off road use of auto fuel. Dr Hogges does recommend still use Avgas for as
tetra ethyl lead is still a good lubricant and I do know Keepit blend is 25%
AVgas and 75% 98 (they have high compression 0540) Anything beyond 20% lead is
just for octane rating.
Ian M
On 22 November 2014 06:53, Rob Thompson <[email protected]> wrote:
Here are the data sheets for Shell and BP.
BP doesn't use much by way of volatile additives and claims a 12month storage
life.
Rob
Rob Thompson
0429 493828
Please note that my new email address is [email protected]
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Date: Fri, 21 Nov 2014 21:09:40 +1100
From: [email protected]
To: [email protected]; [email protected]
Subject: Re: [DOG mailing list] Urgent - Fuel and detonation
Timely reminder Rob. You may find it is more a case of which refinery it
comes from rather than brand.
As Bob said some use LPG, some use Butane and others use whatever they have
too much of. They just get the octane rating test right and once it's out the
gate it's all downhill.
A friend who races motorbike was having trouble so got a laboratory to do
some tests. Short answer - in three weeks 98 ULP turned into 91.5 ULP when
stored in plastic jerry cans.
Local car dealers find the same problem and " make new vehicles run better "
by draining old fuel and replacing with fresh fuel.
Get your ULP from a supplier with fast turnover and don't store it for more
than 3 weeks. Store in sealed containers in the dark.
Happy flying,
John Callahan.
On 21 November 2014 16:40, Laurie Hoffman via dog
<[email protected]> wrote:
Hi All,
I can only reiterate Rob's words. Was astounded that with the extra
compression from new heads and the fact that some of the 'nasty' 98 PULP had
been sitting in storage for a month that we could see such resulting detonation.
After doing nothing but draining the fuel tank and refilling with some
LL100 the motor ran like a charm. After draining the Avgas and refilling with
some BP 98 PULP it ran just as nicely and on a hot day.
Regards
Laurie Hoffman
----------------------------------------------------------------------------
From: bob <[email protected]>
To: [email protected]
Sent: Friday, 21 November 2014, 5:02
Subject: RE: [DOG mailing list] Urgent - Fuel and detonation
All,
One of the cheap volatiles they put in is LPG.
If you want to check just how much, put some fuel into a glass jar with a
tight screw lid.
Put a mark on the meniscus at the start.
Shake vigorously.
Now note the meniscus.
If there is lots of LPG it will have dropped some.
Bob W.
----------------------------------------------------------------------------
From: [email protected] [mailto: [email protected] ] On
Behalf Of Rob Thompson
Sent: Friday, 21 November 2014 12:56 PM
To: [email protected]
Subject: [DOG mailing list] Urgent - Fuel and detonation
G'day all,
Make sure you are not running Shell/Caltex premium now that summer is upon
us.
We had some in the Dimona and in only a matter of weeks the RON rating
dropped to the point where detonation was occurring.
Use BP ...it doesn't have all the cheap volatiles that evaporate quickly
and reduce the RON rating.
Rob Thompson
0429 493828
Please note that my new email address is [email protected]
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