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If they have found a loophole, it would most probably be in the design of the conrod. They may have designed the conrod to stretch under temperature to increase the compression from 16:01 to 18:1. The Aluminium block and bore may be the same as from the previous engine. Of course, this is pure speculation; we would never know what trickery they may have used. Whatever it is, it is quite ingenious.Quote:
Originally Posted by airshifter
The swept volume limit is 1600 cc, so 266.7 cc per cylinder.
For a 16:1 compression ratio the combustion volume is therefore 17.78 cc.
For the compression to increase to 18:1 the combustion chamber needs to reduce to 15.69 cc, a reduction of just over 2 cc.
If we take the bore of the engine to be 80 mm (as indicated by the "2014-2025 engine technical specifications" on this page https://en.wikipedia.org/wiki/Formula_One_engines) then expanding the length of the conrod and piston crown height by 0.4 mm would do the trick.
Sounds simple but the crankcase and cylinder head also expand so you've got to get the rod+piston crown height to expand by 0.4 mm more than the expansion of the crankcase+head. The problem here is that aluminium alloys, typically used in crankcases expand by roughly twice as much as the steels typically used in conrods for the same temperature rise. It might actually be easier to use an alloy steel for the crankcase and reduce that expansion rather than try to increase the expansion of the rod+piston.
I hear Ferrari has gone down the route of a steel crankcase. Even so, they are apparently revising the design of the engine to adopt the Mercedes approach. I think there is more to it than meet the eyes.Quote:
Originally Posted by Steve Boyd
I think you're right, but will we ever find out the truth?Quote:
Originally Posted by Nitrodaze
The other factor is that if you try to do anything fancy with the pistons it has to withstand huge forces and if you don't get that right it's going to ruin your reliability.
It also could be a huge bluff forcing other teams to use part of their cost-cap chasing wild geese.
I wondered about the bluff angle as well. Get in the other teams heads early in the game!Quote:
Originally Posted by Steve Boyd
But IF it's real, I doubt we will ever get the full details. Only time will tell, but if either team builds a strong engine it should help with tissue sales until it's all sorted out.
In the news thread @Fortitude posted:
The bit that says Audi want real time monitoring of compression ratio is interesting. Compression ratio isn't a pressusre ratio, its a volume ratio. To monitor it in real time at 12000 rpm would need a volume measurement at the bottom of the stroke and another at the top of the stroke 2.5 milliseconds apart. You could monitor cylinder pressure continuously but correlating that with compression ratio is virtually impossible. The rule as written is clear and easily enforcible and in my opinion should be left as it is. As engine parts expand in use the compression ratio is bound to change, and that change will be different for different engine designs. the only way to make it the same for everybody would be to mandate a single engine and then it wouldn't be F1.Quote:
Mattia Binotto just told Ferrari why they are already doomed in 2026 battle with Mercedes
21 January 2026
David Comerford
F1 Oversteer
It has been reported that Ferrari could protest the results of the Australian Grand Prix, the first round of the season. They feel Mercedes are breaking the spirit of the rules. However, speaking to The Race, Audi boss Mattia Binotto questioned whether this approach is viable, because they can’t pinpoint exactly which feature of the car is illegal. “You can protest if you know what you’re protesting,” Binotto, the former Ferrari team principal, said.
F1 teams will meet to discuss the issue on Thursday, but Binotto says this won’t lead to a ban. Instead, Audi are pushing for the introduction of a real-time measuring device, but this would take time. “I don’t think there will be clarity or compromise,” he said. “The meeting, which has been set for the 22nd of January, is more to continue to discuss how can we improve or develop a methodology for the future to measure the compression ratios in operating conditions.”
‘Can’t pinpoint exactly which feature of the car is illegal’;
https://www.f1oversteer.com/news/mat...with-mercedes/
That would be full circle to Observer Effect. Putting monitoring devices in the engine would complicate engine design and possibly introduce more failure points in the engine. It is a difficult one to prove either way.Quote:
Originally Posted by Steve Boyd
Ferrari going with a steel cylinder sleeve means it would not take advantage of the expansion trick and may be short by a few horsepower as a consequence. To be fair, the Ferrari approach is the ideal way to design an engine to comply strictly with the regulations. Steel ensures that the engine complies with the 1:16 compression ratio at all temperatures.
That said, the 1:18 expansion trick may not be a good idea in the long run. It may make the engine brittle, especially at those high-temperature tracks. A risky new concept like this one is bound to have lots of teething problems as they work out the best way to cool it or keep it at its optimum operating temperatures at various track conditions. Also, if they turn out to be miles ahead of everyone in the first three races, chances are the paddock may revolt.
From a reliability perspective, it may even out over the season. It would probably be down mostly to the drivers. I worry for Mercedes as they struggled for years to have a car that was solid in all temperature situations. This trick may produce a continuation of that trend. If they can find a solution to ensure the engine is in its optimal temperature in all conditions, then we may be set for a repeat of Alonso vs Hamilton with Russell and Antonelli. That is a mouth-watering proposition. It would be astonishing if the young Italian can win his first F1 championship in his second year. He would be the youngest champion in F1 history l think.
But l doubt it, the experienced head of Russell may win out. Whatever the case, chances are we may be set for another new world champion this season.
These 2026 engines seem to sound louder than past hybrid engines. Big sound is back.
I've had an even better idea!Quote:
Originally Posted by Steve Boyd
You make the crakshaft out of something that expands a lot. That'll give you more compression plus it'll increase the stroke so the capacity goes up as well. Double whammy!
The engine block would need to expand as well, or you may get knocking. But l see how a well-designed crank assembly could produce the desired effect.Quote:
Originally Posted by Steve Boyd