Concept power units from 2030

[DenBommer]

1.6-liter V4, combined with axial flux motor(s) and a solid-state battery.

Nostalgia and innovation combined with this technology. I’m afraid all I can do is dream and hope.

More likely for F1, than V10.
Why V4 though? I4 worked fine for BMW.

Why would you restrict electric motors to axial flux only?

I wouldn’t limit it to axial flux motors only, but I would like it if they developed them for F1 applications.

[mzso]

1.6-liter V4, combined with axial flux motor(s) and a solid-state battery.

Nostalgia and innovation combined with this technology. I’m afraid all I can do is dream and hope.

More likely for F1, than V10.
Why V4 though? I4 worked fine for BMW.

Why would you restrict electric motors to axial flux only?

I wouldn’t limit it to axial flux motors only, but I would like it if they developed them for F1 applications.

Maybe some use them now for one of the motors.

[gruntguru]

Restrict motors to axial flux only? - Did he say that?

He specifically said axual flux motors and solid state batteries.

Yes - but he didn't say "restrict"
.
.

Why V4 over I4? - Packaging.

Okay so what's the advantage? I4 is long and slim, V4 is small and short.
[/quote]
Short is better if you want to add stuff at the end of the crankshaft - like a MGUK.

Not packaging but V engines have stiffer block and shorter stiffer crank, so engine can be lighter and/or rev higher etc.

[mzso]

Yes - but he didn't say "restrict"

He said axial-flux specifically an nothing else. No reason to argue about this.

Short is better if you want to add stuff at the end of the crankshaft - like a MGUK.

Not packaging but V engines have stiffer block and shorter stiffer crank, so engine can be lighter and/or rev higher etc.

Yes, but slimmer is better for aero, or alternatively you can package more stuff to the sides. And with for example aforementioned axial flux design an electric motor can be very short.

It seems like to me it's a choice based on how good you can design other aspects of the engine and how do you want to package it inside the car.

[Hoffman900]

Yes - but he didn't say "restrict"

He said axial-flux specifically an nothing else. No reason to argue about this.

Short is better if you want to add stuff at the end of the crankshaft - like a MGUK.

Not packaging but V engines have stiffer block and shorter stiffer crank, so engine can be lighter and/or rev higher etc.

Yes, but slimmer is better for aero, or alternatively you can package more stuff to the sides. And with for example aforementioned axial flux design an electric motor can be very short.

It seems like to me it's a choice based on how good you can design other aspects of the engine and how do you want to package it inside the car.

Not really. Your airbox and exhaust manifold will be located higher on an Inline engine and will ultimately fill space higher up than a V.

[DenBommer]

Yes - but he didn't say "restrict"

He said axial-flux specifically an nothing else. No reason to argue about this.

Short is better if you want to add stuff at the end of the crankshaft - like a MGUK.

Not packaging but V engines have stiffer block and shorter stiffer crank, so engine can be lighter and/or rev higher etc.

Yes, but slimmer is better for aero, or alternatively you can package more stuff to the sides. And with for example aforementioned axial flux design an electric motor can be very short.

It seems like to me it's a choice based on how good you can design other aspects of the engine and how do you want to package it inside the car.

What other types of electric motors could they use? Apart from axial flux?

And who sees the V4 actually making its debut in Formula 1? I’m thinking around 2030 or 2033, perhaps.

[mzso]

What other types of electric motors could they use? Apart from axial flux?

It's more like a layout then motor type. You can have axial and radial. Axial flux motors are basically disk shaped, radials are cylinder shaped. As far as I know axial flux motors have a better power to weight/volume ratio.

And who sees the V4 actually making its debut in Formula 1? I’m thinking around 2030 or 2033, perhaps.

I don't know. Gruntguru talked up V4 engines (versus straight 4), but I see no evidence of any used in F1. Meanwhile there were multiple independent i4 engines, BMW and Coventry-Climax engine powered cars having won F1 championships.

[Tommy Cookers]

... Axial flux motors are basically disk shaped, radials are cylinder shaped. As far as I know axial flux motors have a better power to weight/volume ratio.
... there were multiple independent i4 engines, BMW and Coventry-Climax engine powered cars having won F1 championships.

disc shaped motors are inferior in response ie when the PU is maximally accelerating/decelerating for gearshifts
direct-drive isn't a USP here because gear reduction between MGU-K and PU is needed anyway (with either motor type)

the I4 BMW and C-C were in design bound to existing production engines
later both companies chose V8, V10, or 16 cylinders having then given themselves a clean sheet of paper
the I4 is also unhelpful to the structural design of the modern car

[mzso]

disc shaped motors are inferior in response ie when the PU is maximally accelerating/decelerating for gearshifts
direct-drive isn't a USP here because gear reduction between MGU-K and PU is needed anyway (with either motor type)

Not that I'm advocating for either, but why are they inferior in response?
I don't think the requirement for reduction is strictly a must.

the I4 BMW and C-C were in design bound to existing production engines
later both companies chose V8, V10, or 16 cylinders having then given themselves a clean sheet of paper
the I4 is also unhelpful to the structural design of the modern car

I think in the high reving NA era killed the approach with low number of cylinders and by the time BMW came back V10 was mandatory anyway. But if revs would stay low (with forced induction) i4/V4 would still be options nowadays.

[gruntguru]

Yes - but he didn't say "restrict"

He said axial-flux specifically an nothing else. No reason to argue about this.

Especially if English is your second language.

[mzso]

Yes - but he didn't say "restrict"

He said axial-flux specifically an nothing else. No reason to argue about this.

Especially if English is your second language.

<Personal stuff removed>

He did specifically say "axial flux", and not electric motor.
<again>
He also said 1.6 liter V4, by "logic" that should be interpreted as V10, V8 or any other engine configuration...

[Tommy Cookers]

disc shaped motors are inferior in response ie when the PU is maximally accelerating/decelerating for gearshifts
direct-drive isn't a USP here because gear reduction between MGU-K and PU is needed anyway (with either motor type)

... why are they inferior in response?
I don't think the requirement for reduction is strictly a must.

a disc-shaped motor will have a large diameter 'rotor' of small axial length
this means (relatively) large inertia and so (relatively) poor response
small diameter and larger axial length will do the same motor job but has (relatively) less inertia so a better response

the F1 PU needs to accelerate/decelerate c.1000 ICE crank rpm in c.5 millisec for good behaviour during gear-shifts
ie the MGU-K is a liability unless it is energised to do this and highly responsive
the responsiveness is better with mechanical reduction as eg the PU inertia will be much less of a load on the MGU-K
basically - if the acceleration-related load is high mechanical reduction is highly beneficial/necessary

the response time of a motor is quantified as its electro-mechanical time constant (a few or a few tens of millisecs)
such a low time constant demands a very low electro-magnetic time constant - this has practical drawbacks
the road EV avoids needing such responsiveness