Wellā¦ā¦ where do I start!
You are absolutely correct on all points, modern Unleaded Fuel is a big issue in many many ways, not only for the customer but also for the Manufacturers and the Environment
Being in the business that Iām in, Iāve had to seek out aLOT of information from the Fuel Companies over the years and am lucky enough to have 3 good mates who worked in the industry at many levels.
Weāve basically all been sold a lie about āthe dangersā of the old Leaded Fuel by both the Government and the Environmental Protection agencies as to why we had to make the change to Unleaded Fuelsā¦ā¦ā¦ for us peasants and the fuel available for our vehicles anyrate!
Everyone here is old enough to remember the rolling Fuel Crisisās of the 70ās and 80ās, the first development of fuel injection for passenger vehicles and the biggest con of all timeā¦ā¦ LPG Gas vehicles.
These all play a big role in the clusterfck of the reason why we now have Unleaded fuel for our personal vehicles, and yet Leaded Fuels are still available for Military/Government/Aviation use.
The Oil Crisis had the Government/Fuel Industry looking for alternatives to straight leaded fuels, which kickstarted the process of developing the new Unleaded fuels we have today.
Old Leaded fuel had a higher Oil ācontentā and Tetra-Ethyl Lead was a cheap additive mixed in as an octane booster/anti knock agent to raise the quality of the older lower octane Leaded Petrol.
Because of the higher oil content and TEL additives, old Leaded fuel was very stable, had a very long shelf life and was very easy/cheap to produce because of its lower refining requirements.
Remember that old Leaded fuel would never āgo offā no matter how long you left it sitting around, everything would still start/run/drive quite happily
The fuel crisis/environmental/EFI evolution etc got the companies to thinking about how they could make more fuel out of the same given amount of oil in their refining process, and eventually came up with the modern Unleaded Fuel that we have today.
This is a mixture of higher refined (thinner/less oil) fuel blended with a mixture of different chemicals to stabilise its properties in combustion passenger engines.
A large portion of those additives are Xylene, Benzene and Toluene, which are all volatile Aromatic compounds that evaporate in the atmosphere at very high amountsā¦ā¦ā¦ and are also known as all being highly dangerous Cancer causing chemicals!
So the old leaded fuel was deemed ādangerousā to our health and the environment, whereas in reality, it wasnāt, and they replaced it with a very dangerous and toxic replacement instead!
Scientist studies proved that the microscope TEL particles in old leaded fuel once burned in the combustion chamber, were turned into microscopic hard little inert ābrickā type particles that once emitted from the exhaust pipe, simply fell to the ground and were no longer a soft āleadā type compound that could cause any danger to the environment or your healthā¦ā¦. But thatās not what the government/environmentalists told us was it?
Why did Fuel Stations stop having āPetrol Attendantsā? It wasnāt because of labour costs or whatever other bullshit reasons the public were told at the time, it was purely health and insurance related risks that no company was wanting to have on their hands involving this new Unleaded fuel.
Iām sure that you can all think back and realise that the introduction of Unleaded fuel is the exact same time that Fuel Attendants all disappeared from the industry, simply because any company/employer who hired these people to spend their working lives breathing in this new highly toxic and cancerous fuel would all be launching their Cancer/Sickness Law Suits against the companies for the rest of their lives
FUN FACT: In some states in the USA, they have gone a step further by adding āsocksā to the nozzles of the fuel hoses that have a vacuum system to capture these volatile gases being emitted from your fuel filler whilst filling up, which is a great idea to protect people from breathing in this toxic crapā¦ā¦ but that costs money, so not many fuel companies care enough about your health to make it a global health standard.
Mechanically wise, remember the introduction in the mid 70ās of Anti-Pollution ADRās and the crazy crap they started putting on the vehicles to āreduce emissionsā from fuel evaporation and exhaust fumesā¦ā¦. well that was the very first attempts by the car manufacturers to start developing systems for the āfuels of the futureā.
Those clumsy first attempts were the very start of controlling highly evaporative fuels and exhaust gas recirculation systems required āmake safeā the toxic additives in developing fuel types such as Unleaded.
Hereās why EFI was developed, along with āfully sealedā fuel tanks/systems and other components such as Catalytic Converters etc, all required to try and capture/burn/exhaust this toxic Unleaded fuel.
Because itās full of extremely volatile/evaporative additives such as Xylene, Toluene and Benzene, a fuel system needs to be fully sealed to prevent it from evaporating to atmosphere when exposed to airā¦ā¦ā¦ are you starting to see what Iām leading towards here with my long rant on this subject
Engines/vehicles that are old style Carburettor fed and are running non-sealed fuel systems simply cannot prevent Unleaded fuel from evaporating off their volatile compounds, which quickly makes the fuel āgo offā once those compounds are no longer present in the fuel mixtureā¦ā¦ basically leaving dishwasher in your fuel tank
Even one week old standard 92-95 octane Unleaded will not mix/burn efficiently in an old carby type engine due to this fact where the volatile compounds are so depleted, that the fuel doesnāt evaporate/mix with the air in the Venturi and enters the engine in large droplets instead of a fine air/fuel mist.
This means loss of power, spark plug fouling and high fuel consumption. Unleaded left in these vehicles/machines any longer than four weeks will give bad starting issues and will even destroy spark plugs in the first few minutes of running, to the point of losing cylinders one at a time depending on the age of the fuel and how long you run it for
BP ULTIMATE 98/SHELL VORTEX
These are our only saviours for us who are in the world of old carby fed petrol vehicles/bikes to keep them running, but also still requires certain measures to ensure the best possible conditions for using them.
In the meetings I had with the BP/SHELL Fuel Reps who were sponsoring various Drag Cars/Vehicles I had over the years, they explained why these premium 98 Octane Unleaded fuels are very different from the standard 92-95 Octane rated fuels.
Basically they have less volatile compounds, which leads to that higher āoilā concentration, and therefore are much more stable than the normal unleaded.
BP 98 is actually refined at 103 Octane, and is the same level when they deliver it to all the various fuel outlets across Australia.
They do this because they are fully aware of the problems with fuel degradation over time, and they allow for this by delivering 103 Octane fuel to the distributors and calculating that fuel will have to survive for 4 weeks in storage on average in the underground tanks at the fuel stations before it is replenished.
They said that through testing, they can 100% guarantee that the 98 Octane fuel you are buying out of their pumps is always a minimum 98 Octane after being stored for that amount of time in those conditions, and depending upon what time you fuel up your vehicle after delivery, it may still be anywhere between 100-103 easily if only in the station tanks for a week or two
They also stated that is why the standard 92-95 fuels with high levels of volatile compounds evaporates/goes off much faster than the 98 Octane.
We confirmed this with our Drag Car being fuel tested by the Scrutineers at the Perth Motorplex. We kept winning races against much larger/expensive competitors and were constantly having protests against us by the losing teams, which meant we had to take the Drag Car straight back to scrutineering before we could carry on racing.
The protests were always accusing us of running ājungle juiceā fuels, and the scrutineers had to take samples/tests straight out of our tank as soon as we finished the race.
We always told them that we were running BP 98 straight out of the bowser, and yet many times it tested 100-103 Octane depending on whether it was fuel we got that day, or was leftover from the last meeting a couple of weeks beforehand.
We had to get a letter from the head of BP explaining why our ā98ā unleaded was returning such high octane levels, and we were always having to explain that we werenāt doing anything dodgy with additives/fuel mixtures etc in our Drag Car
Soā¦ā¦ā¦ if you are still awake and interested, yeah, BP98/SHELL VORTEX and use within a month of putting in your tanks for best performance, donāt leave vehicles/machines sitting with full tanks for months on end!
Final point, ALWAYS use an upper valve lubricant additive in all of your old leaded engines, even if you have had the heads rebuilt for unleaded, that only protects the valve seat and not your valve stems/guides from excessive wear/damage from the lack of lubrication that they used to receive from leaded fuel.
Any questionsā¦ā¦ or am I now banned from replying or being restricted to 4 sentence comments instead ?