Just_a_fan wrote: ↑29 Jun 2021, 15:58
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Presumably, Petronas/Mercedes haven't used their one change yet - we'd have probably heard about it by now.
That`s what is rumoured to be done when Allison was speaking about a let`s say “small” upgrade from the PU…
But it`ll be interesting to hear had it`s a fuel or just an oil upgrade for the fact that the latter give ICE manufacturers a bigger advantage than fuel gives (aka more energy density hence a higher HP output needed just for short times in Q3 and few times when overtaking take place).
From Monza 2020 onwards ICE maps are the same both in qualy and the race and they`ve realized that the big gains in this particular area are coming from running ICE on a higher mode, thus longer and harder. Harder means that ICE could run at higher temps and that`s the role of a new engine oil. At Baku, it`s said that with the introduction of a new spec oil Honda was able to run some 8-10 degrees Celsius higher thus ICE could run at Bahrein levels (Mattia Binotto just confirmed it) but for longer. Officially, with the introduction of the new engine oil Mobil 1 said they were ventured on the, I quote: “The cosmetics industry (which) offers many unique naturally-derived components”.
https://www.motorsport.com/f1/news/how- ... e/6621339/
Professionally speaking I don`t buy it and I think it`s just a smokescreen aimed to mislead and guide the R&D on the wrong path ...
Now there`s another twist in this story, something that people with less chemical background could easily get through: biofuel used in F1 fuels! There is an article on Motorsport.com which said that” Horner and Wolff back delay of new F1 biofuel planned for 2022”:
https://www.motorsport.com/f1/news/horn ... 2/4932134/
Why so? Coz this biofuel has many disadvantages. To start with ICE has worse performance-wise. Then the viscosity index hence lubrification is running lower. Thus, means ICE must run less in anger together with some reliability concerns. Then another headache comes from the combustion chamber, block alloy&stuff and detonation. Practically means a new ICE must be designed from scratch. For this year is just 5.75% biofuel but next year must be 10% and due to cost cap policy, the best route is to develop new oils which should ensure at least 2 important properties: 1. To have a higher viscosity index to compensate for biofuel`s effect; 2. To have a higher HTHS “High-Temperature High Share” parameter, just to ensure that ICE could run longer at the highest mode in races.
And finally, the big rumour is that the 2021 ICE was in fact just the 2020 engine with a new plenum (something they will develop further as Ferrari was acknowledged is worth doing) and they were choosing this route opting to spend more time and money for the 2022 PU which is more important both for it has to double the amount of biofuel but most of all it has to be frozen for the next 3 years … and not to mention the cost cap policy
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