Scuderia Ferrari SF71H

[MtthsMlw]

Is this new? Looks nice.

No nothing new, just posting it here for comparisons in the future.

[Steven]

As a side note, the ferrari engine this year in testing sounded more like the Honda babbling sound during off throttle, although it kicked in much later than the honda off throttle.

This off throttle sound is most likely - Variable displacement.

not legal.

Cylinder deactivation is very legal

[PhillipM]

Not in any way that would change the displacement it's not.

[motobaleno]

Not in any way that would change the displacement it's not.

the name variable displacement is there for marketing reason the displacement is given by the pistons diameter and how far they travel and it is not varied by any of the operations actually needed to obtain what is called "variable displacement". So I don't see why it wouldn't be legal

[motobaleno]

Not in any way that would change the displacement it's not.

the name variable displacement is there for marketing reason the displacement is given by the pistons diameter and how far they travel and it is not varied by any of the operations actually needed to obtain what is called "variable displacement". So I don't see why it wouldn't be legal

[Morteza]

[PhillipM]

the name variable displacement is there for marketing reason the displacement is given by the pistons diameter and how far they travel and it is not varied by any of the operations actually needed to obtain what is called "variable displacement". So I don't see why it wouldn't be legal

It's not there for marketing reasons, some road cars do actually shut the valves on the disabled cylinders to reduce pumping losses.

[ian_s]

This off throttle sound is most likely - Variable displacement.

not legal.

Cylinder deactivation is very legal

the method quoted above is "achieved by keeping the intake and exhaust valves closed for a particular cylinder", which is not allowed. that's variable valve timing.
cylinder cutting is allowed, yes, but the displacement doesn't change as all 6 cylinders will still have flow through them.

[Big Tea]

the name variable displacement is there for marketing reason the displacement is given by the pistons diameter and how far they travel and it is not varied by any of the operations actually needed to obtain what is called "variable displacement". So I don't see why it wouldn't be legal

It's not there for marketing reasons, some road cars do actually shut the valves on the disabled cylinders to reduce pumping losses.

Would not closing the valves increase the pumping losses as the compression work still has to be done (plus what ever suction effect on downstroke)?

Having both valves opening would give a through flow to the exhaust to be used for whatever (providing there is clearance of course)

[ripper]

Front wing changes



Rearview mirrors changes



sources: http://www.f1analisitecnica.com/2018/04 ... llala.html and http://www.f1analisitecnica.com/2018/04 ... denti.html

[MtthsMlw]

The slot on the bottom side of the mirror is almost to small to let air through..

[ian_s]

Would not closing the valves increase the pumping losses as the compression work still has to be done (plus what ever suction effect on downstroke)?

Having both valves opening would give a through flow to the exhaust to be used for whatever (providing there is clearance of course)

deactivating the valves means that whatever is inside the cylinder gets compressed, and then expands again pushing the piston down, so there is little if no pumping losses. Keeping the throttle plates open further while a cylinder is deactivated makes the other cylinders breathe easier and combust more efficiently, which overall means the gains outweigh the losses.

anyways, this is getting off topic as F1 engines can't do this.

[Big Tea]

Would not closing the valves increase the pumping losses as the compression work still has to be done (plus what ever suction effect on downstroke)?

Having both valves opening would give a through flow to the exhaust to be used for whatever (providing there is clearance of course)

deactivating the valves means that whatever is inside the cylinder gets compressed, and then expands again pushing the piston down, so there is little if no pumping losses. Keeping the throttle plates open further while a cylinder is deactivated makes the other cylinders breathe easier and combust more efficiently, which overall means the gains outweigh the losses.

anyways, this is getting off topic as F1 engines can't do this.

Thanks.

[amr]

You have to deactivate the valves in the open position, otherwise you will have pumping losses. Imagine you deactivate the cylinder after the intake stroke, with all valves close, in the compression stroke you will have pumping losses. Next , in the what should have been a power stroke, the pressure (which is atmospheric pressure if is normally aspirated or maybe double if is turbo, multiply by the compression ratio) is too small to do meaningful work and compensate for the pumping loses.
That is because the crank shaft will spin faster then what the pressure in the deactivated cylinder can achieve. The piston is pull down by the inertia of the flywheel/other cylinder work faster than it is pushed by the pressure in the deactivated cylinder.

[FLuidd]

Front wing changes

https://2.bp.blogspot.com/-fnxKX5LilfM/ ... 2-horz.jpg

The wing changes are for high speed tracks since that gap between plates is meant to flex at high speeds.

Once we get to a high downforce track the Bahrain spec wing will be used.