Scuderia Ferrari SF71H

A place to discuss the characteristics of the cars in Formula One, both current as well as historical. Laptimes, driver worshipping and team chatter do not belong here.
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MtthsMlw
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Re: Scuderia Ferrari SF71H

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Vettel165 wrote:
26 Apr 2018, 19:41
Is this new? Looks nice.
No nothing new, just posting it here for comparisons in the future.

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Steven
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Re: Scuderia Ferrari SF71H

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ian_s wrote:
26 Apr 2018, 13:20
CriXus wrote:
26 Apr 2018, 13:18
flexcon wrote:
26 Apr 2018, 12:30

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
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Re: Scuderia Ferrari SF71H

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

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motobaleno
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Re: Scuderia Ferrari SF71H

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PhillipM wrote:
26 Apr 2018, 23:36
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

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motobaleno
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Re: Scuderia Ferrari SF71H

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PhillipM wrote:
26 Apr 2018, 23:36
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

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Morteza
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Re: Scuderia Ferrari SF71H

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Image

Image

Image
"A fool thinks himself to be wise, but a wise man knows himself to be a fool."~William Shakespeare

PhillipM
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Re: Scuderia Ferrari SF71H

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motobaleno wrote:
27 Apr 2018, 00:43

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.

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ian_s
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Re: Scuderia Ferrari SF71H

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Steven wrote:
26 Apr 2018, 21:51
ian_s wrote:
26 Apr 2018, 13:20
CriXus wrote:
26 Apr 2018, 13:18


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.

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Big Tea
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Re: Scuderia Ferrari SF71H

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PhillipM wrote:
27 Apr 2018, 02:53
motobaleno wrote:
27 Apr 2018, 00:43

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)
When arguing with a fool, be sure the other person is not doing the same thing.

ripper
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Re: Scuderia Ferrari SF71H

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MtthsMlw
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Re: Scuderia Ferrari SF71H

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

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ian_s
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Re: Scuderia Ferrari SF71H

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Big Tea wrote:
27 Apr 2018, 10:10
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.

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Big Tea
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Re: Scuderia Ferrari SF71H

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ian_s wrote:
27 Apr 2018, 10:23
Big Tea wrote:
27 Apr 2018, 10:10
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.
When arguing with a fool, be sure the other person is not doing the same thing.

amr
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Re: Scuderia Ferrari SF71H

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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
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Re: Scuderia Ferrari SF71H

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ripper wrote:
27 Apr 2018, 10:13
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.