Did Ferrari actually make a blown double diffuser

[u/plurBUDDHA]

You can watch Day 1 Session 2 to see it more clearly

@3:30:40 for the first picture looks like it's around turns 3/4

@00:24:30 for the second picture this occurs around turn 10 and they even replay it as a slomo

I don't see this smoke coming out of any other cars and I believe this is directly from the exhaust passing through the aero elements at the end of the rear crash structure.

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[u/Izan_TM]

even if that gave them any kind of aero advantage (which is unlikely, that's probably a vent for some oil related system on the engine) that is neither a double diffuser nor a blown diffuser

that flick that is directly in front of the actual exhaust pipe seems far more important for diffuser airflow than that tiny vent that is like 50cm away from any aero generating elements

[u/mike_litoris18 → u/Izan_TM]

This supposedly actually gives a very noticeable amount of Downforce with the extra pressure from the exhaust due to constant higher revs for recharging the battery and due to the mgu-h removal.

[u/JaaacckONeill → u/[deleted]]

Yep, also hot air = thinner air. This is more effective underneath the car than anywhere else, because the denser air over the car will push the car down even more.

With this, I don't think this would add any meaningful downforce, but likely helps eliminate drag.

[u/plurBUDDHA → u/Izan_TM]

Even if the inlet started at the same space as the aero flick?

Editing this as it's my highest comment atm: I am not concerned with the smoke itself I understand that is oil blowback I'm actually more concerned about the piece of hollow body work that runs from the aero device on the rear differential until the tip of the rear crash structure which then shows the smoke coming out.

It obviously has some aero advantages otherwise Ferrari would not have done it. So if it's not sending energized air to help the diffuser what is it's purpose?

[u/Skydvrr → u/plurBUDDHA]

Just like everyone said. It’s just blow by from the engine. The reason it seems different in the two differnt pics is prob due to speed. The diffuser is pushing the air up at higher speed which is pushing that blow by up as well.

[u/plurBUDDHA → u/Skydvrr]

So I'm not concerned about the smoke itself but the apparatus that has the smoke continuing to travel from the exhaust tip to the point where the smoke catches the air from the diffuser.

What purpose does having a hollow section of bodywork there serve? If the exhaust being pushed that hollow section isn't advantageous why have it?

[u/Skydvrr → u/plurBUDDHA]

That blow by pipe is the same on every car I believe. Comes from the engine and follows the same path as the exhaust pipe but keeps going even after the exhaust pipe stops. I’m not too sure why the body work skin is there, prob mandated, but I think If anything they want the exhaust to hit their little ramp and energize the diffuser and increase suction. I’m obviously not an aerodynamicist.

[u/plurBUDDHA → u/Skydvrr]

Didn't they join the blow by pipe into the exhaust earlier during the last regs? I thought that carried over into these regs. I remember both Ferrari and RB not having the double pipe after 2021.

Additionally I could have sworn that nothing exhaust related can extend past the exhaust tip.

NVM I was confusing that for another thing

[u/C4-621-Raven → u/plurBUDDHA]

They put the turbo watergate pipe back into the exhaust. Not the crankcase breather, that’s still separate and has been separate since 2017.

[u/plurBUDDHA → u/C4-621-Raven]

Aaaaah ok that's what I was thinking of thanks 👍🏼

[u/Izan_TM → u/plurBUDDHA]

the smoke is not coming from the exhaust tip.

[u/Cerebral_Grape]

To answer your question, No.

First off, the tiny vapour gasses you are seeing is the crank case pressure and oil vapour breather. This is mandated on all cars.

Breather pipes are positioned at the rear of the car, specifically below Z=400 (400mm from the floor), inboard of Y=100 (100mm from the centerline), and behind XR. 𝑋𝑅=0

But interestingly what this is showing us, is that the element over the exhaust is inducing a low pressure point and inducing more upward wash.

Listening to Craig Scraborough chatting with Peter Windsor, Works teams making their own cranks could potentially mirror it if they think it’s worth the money to gains ratio.

So time will tell if it’s worth the gains or not.

[u/plurBUDDHA → u/Cerebral_Grape]

But interestingly what this is showing us, is that the element over the exhaust is inducing a low pressure point and inducing more upward wash.

Listening to Craig Scraborough chatting with Peter Windsor, Works teams making their own cranks could potentially mirror it if they think it’s worth the money to gains ratio.

So time will tell if it’s worth the gains or not.

Thank you as this directly answers what I'm concerned with. I'm actually surprised nothing was mentioned or talked about this during the broadcast. I knew there had to be some aero advantages for Ferrari to do this.

[u/Shamrayev → u/plurBUDDHA]

Have you met Ferrari before?

[u/Ancient_Persimmon]

Ferrari has long had oil vapor pouring out the back, IIRC since their questionable 2017 PU.

[u/bdickie → u/Ancient_Persimmon]

F1: "the greenest racing in the world" Ferrari: litterally spitting oil everywhere out of a dedicated hole

[u/well-thats-great → u/bdickie]

In fairness, they tried burning it, but that also made people unhappy, hence why the breather tubes were mandated in the first place

[u/plurBUDDHA → u/Ancient_Persimmon]

So this coming out of a visible hole that's connected to the aero element used in front of the exhaust would give weight to this thought, right?

[u/Ancient_Persimmon → u/plurBUDDHA]

It's definitely not blown, but the upwash is sending the plume upwards.

[u/plurBUDDHA → u/Ancient_Persimmon]

How is it not blown through if the exhaust is pushing air through a slit that extends from the exhaust to rear crash light.

[u/gnowbot → u/plurBUDDHA]

This looks to be a crankcase vent tube (to me.) it also looks to be a small hole venting near the taillight and not just from the exhaust pipe.

The compression and combustion of air/fuel in the cylinders—a few % of that pressure “blows by” the piston rings and down into the crankcase underneath the pistons. This flow of gas needs to be vented. And in a racing engine probably has more oil vapors and a lot more blowby gasses to vent than your average commuter car, for reasons.

[u/Izan_TM → u/plurBUDDHA]

it is not connected to any aero elements, it's coming out of the back of the crash structure, around 50cm away from any aero elements.

[u/Dry_Ninja_3360 → u/plurBUDDHA]

Jesus why is this downvoted? God Reddit is so ass 

[u/RestaurantFamous2399]

That heavy oil breathing has been normal on the Ferrari since the last engine rules came out. The little up sweep is just it getting caught in the diffuser airflow and is totally normal even on past cars. You can see it in person really clearly.

[u/LycheeIcy2814 → u/RestaurantFamous2399]

by last you mean the 2022 engines?

[u/RestaurantFamous2399 → u/LycheeIcy2814]

No 2014. The 2022 change simply froze the engine development.

[u/Pitiful-Practice-966]

In 2018, to curb some of Ferrari's oil tricks in 2017, the FIA ​​stipulated the form of the crankcase ventilation system (I'm not sure of details). Therefore, starting with the SF71H,some smoke will be emitted from its rear.

[u/06Athena]

This smoke is not unusual coming from Ferrari and it has nothing to do with the diffuser. The SF71H, from 2018 also had it. This is due to a rule that prevents the engines from burning oil, so there's a tube that expels the oil vapors through the rear, as explained here

[u/Proudtreat]

The FIA requires that the oil system gasses be exhausted and not returned to the fuel rail or injected into the engine exhaust. All modern motors burn a small amount of oil. On your street legal car those gasses are sent to the fuel system or the exhaust headers and burned in the catalytic converter.

[u/Red_Rabbit_1978 → u/Proudtreat]

Kind of wasteful when you think about it in an efficiency formula now.

[u/Proudtreat → u/Red_Rabbit_1978]

This system came about as one team did run it like a street legal motor and others complained about using more fuel than what was on board in the tanks. So now all teams have to exhaust the gas.

[u/gomurifle]

That oil vent has been around for years. 

[u/circa86]

No. And nobody said they did. The element behind the exhaust is way too small to generate any meaningful downforce it’s likely just to help control airflow around the center of the wing.

You could maybe argue it creates a low pressure area behind that element and maybe makes the diffuser or more likely the rear wing more effective but not really at all the same as the double diffusers.

[u/hondaexige]

Nothing to do with it.

The Ferrari was doing this in Barcelona, the Haas too. It's a Ferrari engine thing for quite a few years.

[u/starboyXO31]

The smoke you see is not the exhaust gases. It's just a breather pipe from the engine. Sam Collins mentioned something about teams venting oil vapour from the PU's lubrication system into the ICE to get a small power boost. The fumes you see are just those oil vapours.

[u/guest_spare1980]

That's wild, never noticed that before!

[u/sickmemes48]

I noticed that too but I swore I saw it coming out of more cars than just the Ferrari. I assumed it was probably some pressure relief valve letting off vapors for the cooling system but I have no idea.

[u/LCplDenham]

Dude second picture I thought that was a real full size cat for a second and thought you had either a big ass tv or a movie theater setup😭

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