Right but he isn't the one that had the contact at AM.
Right but he isn't the one that had the contact at AM.
im definitely not a honda employee and i trust what that guy says, but from what ive gathered, a 16.1 to 18.1 gain from deformation of materials would be extremely difficult. maybe merc has some other trick to achieve 15 more hp, but im not going to worry about it until we see it. maybe their gain is less. any 5hp gain is going to help battery regen thoough, so it wouldnt just be a net gain in hp, itll mean more battery deployment too. the good thing is that i think redbull has said that it isnt using this "trick" now, so you would think that it would help if it all comes down to a vote. maybe honda are loving all the attention is going at mercedes, because they have some even better tricks up their sleeves. we can hopeGhostF1 wrote: ↑14 Jan 2026, 23:49From a known Honda employee that very rarely posts the occasional insight in the General Honda F1 thread. He stated he doesn't believe the compression ratio "trick" is even a loophole (Jan 3rd). Gives the impression this isn't anything new and has probably been explored well before the '26 powertrains. And this hitting the media is nothing new to any manufacturer, it's just media outlets making a buzz over nothing.mickael.olr wrote: ↑13 Jan 2026, 20:27That’s assuming only Mercedes found a ‘trick’ but it’s the only rumor we’ve heard so far. For all we know, Honda or others could have something up their sleeve too. Speculating about lost lap time before we’ve even seen the car on track is just a waste of time.
I don't know if I would even call it a loophole. Compression ratio is measured one way and what happens outside of that parameter is up to each PU supplier. There are many ways "to skin a cat" as the saying goes. I personally have no concerns about it and using metal compositions in the piston to maximize power should be each manufacturer's goal IMO.
According to Wazari, who works for Honda, this is not considered a trick, he thinks everyone uses this. So the gains are small.zoroastar wrote: ↑16 Jan 2026, 09:24im definitely not a honda employee and i trust what that guy says, but from what ive gathered, a 16.1 to 18.1 gain from deformation of materials would be extremely difficult. maybe merc has some other trick to achieve 15 more hp, but im not going to worry about it until we see it. maybe their gain is less. any 5hp gain is going to help battery regen thoough, so it wouldnt just be a net gain in hp, itll mean more battery deployment too. the good thing is that i think redbull has said that it isnt using this "trick" now, so you would think that it would help if it all comes down to a vote. maybe honda are loving all the attention is going at mercedes, because they have some even better tricks up their sleeves. we can hopeGhostF1 wrote: ↑14 Jan 2026, 23:49From a known Honda employee that very rarely posts the occasional insight in the General Honda F1 thread. He stated he doesn't believe the compression ratio "trick" is even a loophole (Jan 3rd). Gives the impression this isn't anything new and has probably been explored well before the '26 powertrains. And this hitting the media is nothing new to any manufacturer, it's just media outlets making a buzz over nothing.mickael.olr wrote: ↑13 Jan 2026, 20:27
That’s assuming only Mercedes found a ‘trick’ but it’s the only rumor we’ve heard so far. For all we know, Honda or others could have something up their sleeve too. Speculating about lost lap time before we’ve even seen the car on track is just a waste of time.
I don't know if I would even call it a loophole. Compression ratio is measured one way and what happens outside of that parameter is up to each PU supplier. There are many ways "to skin a cat" as the saying goes. I personally have no concerns about it and using metal compositions in the piston to maximize power should be each manufacturer's goal IMO.

From what I've read, 16:1 at ambient would turn to 17.?:1 at 200C. From there to get to 18.3:1 isn't as much a stretch.zoroastar wrote: ↑16 Jan 2026, 09:24im definitely not a honda employee and i trust what that guy says, but from what ive gathered, a 16.1 to 18.1 gain from deformation of materials would be extremely difficult. maybe merc has some other trick to achieve 15 more hp, but im not going to worry about it until we see it. maybe their gain is less. any 5hp gain is going to help battery regen thoough, so it wouldnt just be a net gain in hp, itll mean more battery deployment too. the good thing is that i think redbull has said that it isnt using this "trick" now, so you would think that it would help if it all comes down to a vote. maybe honda are loving all the attention is going at mercedes, because they have some even better tricks up their sleeves. we can hopeGhostF1 wrote: ↑14 Jan 2026, 23:49From a known Honda employee that very rarely posts the occasional insight in the General Honda F1 thread. He stated he doesn't believe the compression ratio "trick" is even a loophole (Jan 3rd). Gives the impression this isn't anything new and has probably been explored well before the '26 powertrains. And this hitting the media is nothing new to any manufacturer, it's just media outlets making a buzz over nothing.mickael.olr wrote: ↑13 Jan 2026, 20:27
That’s assuming only Mercedes found a ‘trick’ but it’s the only rumor we’ve heard so far. For all we know, Honda or others could have something up their sleeve too. Speculating about lost lap time before we’ve even seen the car on track is just a waste of time.
I don't know if I would even call it a loophole. Compression ratio is measured one way and what happens outside of that parameter is up to each PU supplier. There are many ways "to skin a cat" as the saying goes. I personally have no concerns about it and using metal compositions in the piston to maximize power should be each manufacturer's goal IMO.
Agreed. And how much any of them manage to increase compression ratio beyond the 16:1 at ambient figure, no one really knows. I think the point is, it isn't surprising to Honda, it's not a "missed trick", they believe it's on the engineers to explore territory beyond the regs, and it is just the current topic of media obsession going into a totally unknown regulation change season.diffuser wrote: ↑17 Jan 2026, 03:30From what I've read, 16:1 at ambient would turn to 17.?:1 at 200C. From there to get to 18.3:1 isn't as much a stretch.zoroastar wrote: ↑16 Jan 2026, 09:24im definitely not a honda employee and i trust what that guy says, but from what ive gathered, a 16.1 to 18.1 gain from deformation of materials would be extremely difficult. maybe merc has some other trick to achieve 15 more hp, but im not going to worry about it until we see it. maybe their gain is less. any 5hp gain is going to help battery regen thoough, so it wouldnt just be a net gain in hp, itll mean more battery deployment too. the good thing is that i think redbull has said that it isnt using this "trick" now, so you would think that it would help if it all comes down to a vote. maybe honda are loving all the attention is going at mercedes, because they have some even better tricks up their sleeves. we can hopeGhostF1 wrote: ↑14 Jan 2026, 23:49
From a known Honda employee that very rarely posts the occasional insight in the General Honda F1 thread. He stated he doesn't believe the compression ratio "trick" is even a loophole (Jan 3rd). Gives the impression this isn't anything new and has probably been explored well before the '26 powertrains. And this hitting the media is nothing new to any manufacturer, it's just media outlets making a buzz over nothing.
if 17:1 comes from just running the car then this is all just a bunch of nonsense haha. my fear was that honda missed a really obvious "loophole" because they started late. if they achieve that much pressure so easily, then its pretty weiird for everyone that makes a living reporting on the sport are that clueless. you have to know that the heat generated inside a cylinder would have some kind of affect. pretty much any icu is designed with expansion in mind. now somebody at redbull is saying that all the rumors about mercedes being ahead in the new regs cae from mercedes themselves to draw engineers to the team again.diffuser wrote: ↑17 Jan 2026, 03:30From what I've read, 16:1 at ambient would turn to 17.?:1 at 200C. From there to get to 18.3:1 isn't as much a stretch.zoroastar wrote: ↑16 Jan 2026, 09:24im definitely not a honda employee and i trust what that guy says, but from what ive gathered, a 16.1 to 18.1 gain from deformation of materials would be extremely difficult. maybe merc has some other trick to achieve 15 more hp, but im not going to worry about it until we see it. maybe their gain is less. any 5hp gain is going to help battery regen thoough, so it wouldnt just be a net gain in hp, itll mean more battery deployment too. the good thing is that i think redbull has said that it isnt using this "trick" now, so you would think that it would help if it all comes down to a vote. maybe honda are loving all the attention is going at mercedes, because they have some even better tricks up their sleeves. we can hopeGhostF1 wrote: ↑14 Jan 2026, 23:49
From a known Honda employee that very rarely posts the occasional insight in the General Honda F1 thread. He stated he doesn't believe the compression ratio "trick" is even a loophole (Jan 3rd). Gives the impression this isn't anything new and has probably been explored well before the '26 powertrains. And this hitting the media is nothing new to any manufacturer, it's just media outlets making a buzz over nothing.
If its anything like what Sauber did in 2022, getting to the minimum weight this early may involve making a car with a shorter wheelbase and overall length than the rules allow which will compromise aero development later on.DJ Downforce wrote: ↑19 Jan 2026, 10:50I read that Alpine have apparently managed to get to the minimum weight limit. So I do think it is possible, but it makes you wonder if they've had to compromise other developmental areas to do this.
In my opinion, a team who arrives at the weight limit at the start could fight for podiums until the others catch up through weight saving of their own or just pure performance
The engine doesn't run at 200C, more like 120C.diffuser wrote: ↑17 Jan 2026, 03:30From what I've read, 16:1 at ambient would turn to 17.?:1 at 200C. From there to get to 18.3:1 isn't as much a stretch.zoroastar wrote: ↑16 Jan 2026, 09:24im definitely not a honda employee and i trust what that guy says, but from what ive gathered, a 16.1 to 18.1 gain from deformation of materials would be extremely difficult. maybe merc has some other trick to achieve 15 more hp, but im not going to worry about it until we see it. maybe their gain is less. any 5hp gain is going to help battery regen thoough, so it wouldnt just be a net gain in hp, itll mean more battery deployment too. the good thing is that i think redbull has said that it isnt using this "trick" now, so you would think that it would help if it all comes down to a vote. maybe honda are loving all the attention is going at mercedes, because they have some even better tricks up their sleeves. we can hopeGhostF1 wrote: ↑14 Jan 2026, 23:49
From a known Honda employee that very rarely posts the occasional insight in the General Honda F1 thread. He stated he doesn't believe the compression ratio "trick" is even a loophole (Jan 3rd). Gives the impression this isn't anything new and has probably been explored well before the '26 powertrains. And this hitting the media is nothing new to any manufacturer, it's just media outlets making a buzz over nothing.
Typical temperatures:Badger wrote: ↑19 Jan 2026, 19:35The engine doesn't run at 200C, more like 120C.diffuser wrote: ↑17 Jan 2026, 03:30From what I've read, 16:1 at ambient would turn to 17.?:1 at 200C. From there to get to 18.3:1 isn't as much a stretch.zoroastar wrote: ↑16 Jan 2026, 09:24
im definitely not a honda employee and i trust what that guy says, but from what ive gathered, a 16.1 to 18.1 gain from deformation of materials would be extremely difficult. maybe merc has some other trick to achieve 15 more hp, but im not going to worry about it until we see it. maybe their gain is less. any 5hp gain is going to help battery regen thoough, so it wouldnt just be a net gain in hp, itll mean more battery deployment too. the good thing is that i think redbull has said that it isnt using this "trick" now, so you would think that it would help if it all comes down to a vote. maybe honda are loving all the attention is going at mercedes, because they have some even better tricks up their sleeves. we can hope
You beat me to it. Maximum pressure of the cooling system is 3.75 bar; at that pressure water boils at 141°C. Sure, some parts will be hotter but there is also oil spray on pistons.Badger wrote: ↑19 Jan 2026, 19:35The engine doesn't run at 200C, more like 120C.diffuser wrote: ↑17 Jan 2026, 03:30From what I've read, 16:1 at ambient would turn to 17.?:1 at 200C. From there to get to 18.3:1 isn't as much a stretch.zoroastar wrote: ↑16 Jan 2026, 09:24
im definitely not a honda employee and i trust what that guy says, but from what ive gathered, a 16.1 to 18.1 gain from deformation of materials would be extremely difficult. maybe merc has some other trick to achieve 15 more hp, but im not going to worry about it until we see it. maybe their gain is less. any 5hp gain is going to help battery regen thoough, so it wouldnt just be a net gain in hp, itll mean more battery deployment too. the good thing is that i think redbull has said that it isnt using this "trick" now, so you would think that it would help if it all comes down to a vote. maybe honda are loving all the attention is going at mercedes, because they have some even better tricks up their sleeves. we can hope
The CR isn't in the water jackets or the block. It's between the pistons and the cylinder head. Those parts are the temperatures I posted above, significantly hotter. That's where you'll get the largest change in size.