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Tin-antimony alloy keeps engines permanently clean - that's why the manufacturers don't use it 

In 1942, American motor industry engineers discovered the tin-antimony pellets, used in the fuel tanks of Hurricane and Yak fighter planes on the Russian front, caused fuel to act as a self-cleaner as it combusted. Removing carbon deposits and keeping any engine permanently clean and efficient. They were very worried. This discovery could devastate the profits from spares and repairs and could even slow new car sales. But for the fuel additive companies, with dispenser cans next to every fuel pump, the news was disastrous. So, they started a smear campaign. And motoring's biggest lie was born. 

With the help of well-connected friends, the pellets were bombarded with negative rumours and misleading press. Along with snake oil slurs and stories of exploding engines the plausible sounding, 'if they were that good the manufacturers would fit them' was circulated through garages and dealer networks. It didn't take long before ordinary motorists were doing the industry's dirty work and repeating the lies circulated to fool them. Over the last 80-years, motoring's biggest lie has been repeated so many times, especially in the UK, many have come to believe it.

The widespread use of tin-antimony catalysts

The effectiveness of tin-antimony alloy in permanently eliminating carbon deposits from petrol and diesel engines has always been easily measured and observed using industry-standard before & after emissions results. In exactly the same way chemical fuel additives are tested. As deposits are removed a measurable reduction in excess exhaust emissions is seen as the engine becomes progressively cleaner. Along with industry-standard before & after emissions results and MOT emissions certification, FTC has been independently verified by world leaders Emissions Analytics, using PEMS (portable emissions measurement system) the advanced real-world measurement technology used by motor manufacturers.

Tin-antimony fuel catalysts were first used commercially in the 1960s in South Africa, to keep the engines in the underground mining equipment belonging to the Anglo American Mining Company permanently clean. Due to their success they were then used in the South African Marine Corporation's ocean-going ocean-going container ships, to extend service intervals, cut black smoke and prevent fuel wastage. And following the results of the 1998 fleet trials on the Philadelphia Coca Cola Bottling Company's delivery lorries, tin-antimony catalysts are widely used by commercial and domestic vehicle owners worldwide. 

How carbon deposits affect all petrol and diesel engines

The Worldwide Fuel Charter clearly states that even the use of high quality fuel leads to carbon deposit formation, affecting performance and leading to increased engine-out emissions. The Handbook of Air Pollution from Internal Combustion Engines confirms carbon deposits affect all internal combustion engines, causing reduced power, driveability issues, poor fuel economy and excess exhaust emissions. This helps explain why record numbers of relatively young vehicles fail the MOT emissions test every year. Data from the Driver & Vehicle Standards Agency (DVSA) confirms 1,273,771 vehicles were taken off the road in 2019/20. With 849,537 petrol engined and 430,527 diesel engined vehicles failing the MOT emissions test due to carbon deposits.

For the last 40-years modern vehicles have been fitted with engine control units (ECU) and fuel injection systems. The ECU uses information from numerous engine sensors to deal with the problem’s engine deposits cause, constantly retarding the engines timing to prevent overheating, engine knock and pinking. With the ECU masking the problems, it’s not surprising that often the first we know of hidden deposits is when dashboard warning lights start flashing, our engine goes into limp mode or another deposit related problem occurs like a blocked fuel injector/s, misfire/s or sticking valve/s.

As deposits build-up on fuel injectors the ECU increases the injector pulse width - keeping the injectors open longer to increase the fuel flow. This over fuelling increases carbon build-up on the back of intake valves which then restricts air flow affecting engine efficiency and preventing the valves from closing/seating properly. Partially burnt fuel vapour then escapes during the compression stroke increasing emissions and becoming carbonised throughout the exhaust system. Leading to the sooty formations that clog EGR valves, block DPFs and ruin the CAT.

Removing carbon deposits reduces the engines operating temperature and allows the ECU (where applicable) to progressively reset the engine's timing and fuel trim settings and allows the valves to close/seat properly. When tin-antimony alloy is placed in the fuel tank of a new vehicle or one with a clean engine it will stop deposits forming in the first place. Which simply means performance, economy and emissions will all remain close to those of a brand new engine.



The long-established use of tin-antimony catalysts

Tin-antimony catalysts were developed by Russian scientists for use in the fuel tanks of British Hurricanes and Yak fighter planes, operating out of Murmansk during the winter of 1941. Low temperature waxing issues with the local aviation fuel were causing crystalline deposits to clog the planes carburettors which was leading to engines cutting out and mid air stalling. The Russian planes were restricted to operating below 15,000 ft and the British Hurricanes under 16,000 ft until a solution could be found. When the Russian's tin-antimony pellets were added to the planes fuel tanks the problems were solved. With the fighters then able to operate over and above their usual ceiling of 20,000 ft using exactly the same fuel. The WW2 campaign, code named 'Operation Benedict' is recorded in Hurricanes over Murmansk by John Golley, and in Force Benedict by Hurricane fighter pilot Eric Carter, who served in Murmansk, and details the wartime use of fuel catalysts and their subsequent post war development.

FTC pellets are solid phase heterogeneous surface catalysts. Similar to the surface catalysts used to initiate molecular changes during the production of bio diesel, fertiliser and plastics. Solid phase catalysts are incredibly hard and non-sacrificial which gives them a virtually unlimited lifespan. Tin-antimony alloy triggers a reaction in petrol & diesel fuels but is not used up during this reaction. And because FTC pellets don't dissolve, break-down or wear away you only need to add them to your vehicle once. 

Hurricanes over Murmansk by John Golley ISBN 1840372982
Force Benedict by Eric Carter ISBN 1444785141