🧵 // WHY AREN’T SPEC SERIES EQUAL MACHINERY? explained by an...
vivienne ★ DINO BEGANOVIC FEATURE WIN!!@popoffmax
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Sep 18, 2026
~2 min read
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🧵 // WHY AREN’T SPEC SERIES EQUAL MACHINERY?
explained by an engineering student, licensed race official specialising in scrutineering, and full-time feeder series fan 🩵
#f1twt #f2 #f3 #formularegional #f4
explained by an engineering student, licensed race official specialising in scrutineering, and full-time feeder series fan 🩵
#f1twt #f2 #f3 #formularegional #f4
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1/9
there’s a really common misconception that because junior formulae are spec series – i.e. all cars are of the same specification (design) – teams and cars are equal in performance. if you thought that too, don’t worry, you’re here to learn!! here’s why that’s wrong… ↓↓↓
there’s a really common misconception that because junior formulae are spec series – i.e. all cars are of the same specification (design) – teams and cars are equal in performance. if you thought that too, don’t worry, you’re here to learn!! here’s why that’s wrong… ↓↓↓
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2/9 ENGINES
vital to understanding spec series machinery is this thing called engineering tolerances!
it’s impossible to manufacture engine parts to the exact same measurements, to the atom, every time – tolerances are the allowed range of variation.
exact = zero tolerance
vital to understanding spec series machinery is this thing called engineering tolerances!
it’s impossible to manufacture engine parts to the exact same measurements, to the atom, every time – tolerances are the allowed range of variation.
exact = zero tolerance
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3/9
small, precise tolerances are very expensive to produce – so stingy manufacturers like mecachrome use looser tolerance. inconsistency leads to parts fitting together poorly, mechanical inefficiency, increased wear and tear, and unreliability due to more leaks and failures!
small, precise tolerances are very expensive to produce – so stingy manufacturers like mecachrome use looser tolerance. inconsistency leads to parts fitting together poorly, mechanical inefficiency, increased wear and tear, and unreliability due to more leaks and failures!
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4/9
this is why “engine lottery” and “getting mecachromed” are such ubiquitous concepts to feeder series fans; mecachrome engines, used by many junior series, are notoriously unreliable and inconsistent, with varying output. their quality control is awful so they can lower costs
this is why “engine lottery” and “getting mecachromed” are such ubiquitous concepts to feeder series fans; mecachrome engines, used by many junior series, are notoriously unreliable and inconsistent, with varying output. their quality control is awful so they can lower costs
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5/9
so, random engine draws mean that by sheer luck, you can get an engine that blows up constantly or is nearly 30 horsepower down – all while still being the same engine spec, legally within the same regulations!! this makes a huge, noticeable difference towards car performance
so, random engine draws mean that by sheer luck, you can get an engine that blows up constantly or is nearly 30 horsepower down – all while still being the same engine spec, legally within the same regulations!! this makes a huge, noticeable difference towards car performance
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6/9 FINANCES
different teams are better funded than others. you might think, well, engines are random, why would the amount of money they have matter? but the thing is, better funded teams will have better resources and staff and data, meaning consistently better aero setup.
different teams are better funded than others. you might think, well, engines are random, why would the amount of money they have matter? but the thing is, better funded teams will have better resources and staff and data, meaning consistently better aero setup.
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7/9
so, you’ll find that richer drivers (+ drivers with significant backing!) will end up at teams that consistently perform much better, inflating their results, and non-academy drivers, as well as lacking academy engineering and development support, often end up at worse teams.
so, you’ll find that richer drivers (+ drivers with significant backing!) will end up at teams that consistently perform much better, inflating their results, and non-academy drivers, as well as lacking academy engineering and development support, often end up at worse teams.
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8/9
and lastly, there’s the case of replacement parts – generally, these are paid for by the drivers themselves. richer drivers can afford more frequent repairs or replacements and thus better car performance, due to less wear and deformation impacting aero and engine capacity.
and lastly, there’s the case of replacement parts – generally, these are paid for by the drivers themselves. richer drivers can afford more frequent repairs or replacements and thus better car performance, due to less wear and deformation impacting aero and engine capacity.
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9/9
and obviously, it’s impossible for us as viewers to know for sure where each car's overall performance is at exactly – but generally, once you’re familiar with the drivers and teams and have watched enough races analytically, you can form a solid estimation!!
and obviously, it’s impossible for us as viewers to know for sure where each car's overall performance is at exactly – but generally, once you’re familiar with the drivers and teams and have watched enough races analytically, you can form a solid estimation!!
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that's all for now, bye guys!! i hope this thread is helpful xx
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vivienne ★ DINO BEGANOVIC FEATURE WIN!!@popoffmax
i've written an article (link in reply!) with mostly the same information but in more detail!! i go into more technical stuff, and put things into perspective with examples that i think would be really helpful for both f1 fans and feeder series fans alike - give it a read ^^