RE: 1,146hp Aston Martin Valkyrie not verified...yet

[kambites]

Don't bikes also have significantly less stringent emissions regulations to comply with?

Worth noting also that bike engines are typically around the 250-300cc per cylinder mark where this will be about twice that which makes it quite a lot harder to get it to rev to the same level and also makes it harder to achieve the levels of volumetric efficiency that bike engines can achieve at high revs. I'm guessing this is going to need around 15k rpm to achieve those figures and achieve more than 100% VE while doing so, which with a cylinder volume of over 500cc is going to be very impressive. Especially when having to be euro-6C/D compliant at the same time.

Edited by kambites on Wednesday 22 August 14:55

[stevesingo]

With a BMEP of 15bar (which is at the upper end of what could be reasonably expected, we can expect an peak power engine speed of 10500rpm.

FWIW BMEP at max power of;

991GT3 RS = 13.6

F12 Superfast = 13.0

Taking the lower of the two, it could rev to in excess of 11000rpm.

[Plug Life]

Car-Matt said:

Plug Life said:

The Rimac C Two burns better this.

ftfy

No hamsters allowed!

[DanielSan]

nyxster said:

I doubt a lot of the owners would be physically fit or race driver skinny enough to even get in it. They should get Tesla to do a remote control version so the overweight billionaire can drive it around his private track whilst sat in a chair dressed in a race suit.

There’s more room in it than you’d expect. I know someone whose sat in the car they’re using to show customers the interior etc, he’s 6’2-6’3 or thereabouts and on the bigger side and fits with no issues. It’s no Rapide when it comes to comfort but it’s more than comfortable enough for what it’s designed to do.

[redroadster]

You just know this will spund awsome and be fastest road registered car around a track and british built a world beater

[anonymous-user]

DanielSan said:

There’s more room in it than you’d expect. I know someone whose sat in the car they’re using to show customers the interior etc, he’s 6’2-6’3 or thereabouts and on the bigger side and fits with no issues. It’s no Rapide when it comes to comfort but it’s more than comfortable enough for what it’s designed to do.

I don't think using the Rapide as a reference for interior space is entirely sensible, what with it being the smallest 4 seater ever built! (i'm 6.2 and i can't even get into the back seats of a rapide......) ;-)

[boxerTen]

kambites said:

Worth noting also that bike engines are typically around the 250-300cc per cylinder mark where this will be about twice that which makes it quite a lot harder to get it to rev to the same level and also makes it harder to achieve the levels of volumetric efficiency that bike engines can achieve at high revs. I'm guessing this is going to need around 15k rpm to achieve those figures and achieve more than 100% VE while doing so, which with a cylinder volume of over 500cc is going to be very impressive. Especially when having to be euro-6C/D compliant at the same time.

Edited by kambites on Wednesday 22 August 14:55

Power output of an engine scales with the total bore area (not capacity!), since its the bore area that determines the size of the valves, and thereby the amount of fuel-air mixture that can flow into the cylinder. Maximum velocity of the fuel-air mixture is limited by it 'choking' if speeds get near the speed of sound.

A 6.5 litre V12 has cylinders of 541 cc, 2.17 times the capacity of a 250 cc motorcycle cylinder but only 1.675 times the bore area. Consequently if the 250cc cylinder produces 200 bhp/litre one can expect the 561 cc car cylinder to produce 77% of that (155 bhp/litre) at 77% of the revs. Note the piston speeds will be the same in both cases, and the velocity of the fuel-air mixture flowing into the cylinder the same too.

[Megaflow]

I have no trouble believing 1000bhp is possible from a 6.5L V12 for a road car. I have a lot of trouble believing Aston Martin & Red Bull have managed to squeeze enough cooling for said monster engine into the concept car we have all seen to date.

[rallye_turbo]

markh450 said:

Agreed, but doesn't it put into perspective how impressive modern superbikes engines are? Many now routinely develop this same n/a 200bhp/litre. If these can be made reliable enough to be sold with 5000 mile service intervals and expected to do 40-50k, then surely a car maker can do the same with the right budget and without having to worry about making the car / engine practical enough to run to the shops etc etc.

Remember watching them racing more than 20 years ago with 400bhp/L - now that’s impressive!

[roy928tt]

I can't imagine Adrian Newey allowing this car to weigh as much as 1100 kg....

[AER]

Max_Torque said:

DanielSan said:

There’s more room in it than you’d expect. I know someone whose sat in the car they’re using to show customers the interior etc, he’s 6’2-6’3 or thereabouts and on the bigger side and fits with no issues. It’s no Rapide when it comes to comfort but it’s more than comfortable enough for what it’s designed to do.

I don't think using the Rapide as a reference for interior space is entirely sensible, what with it being the smallest 4 seater ever built! (i'm 6.2 and i can't even get into the back seats of a rapide......) ;-)

Sir should order the Raaaaaaaaapide instead.

[Nerdherder]

Imagine if the next Lotus would be a semi-affordable 200 bhp Valkyrie like sportscar.

[The Dictator]

Oldwolf said:

Nice to see the VW Beetle split-screen brought up to date :-)

That's the windscreen wiper.

[Maldini35]

As has been said - the total bhp figure almost certainly includes the hybrid element.

But to be honest I don’t care what the final figure is. 100bhp more or less is insignificant.
I know the project has been very tough for the development team but when they do deliver the car it will be a stunning achievement.
Top Trump power figures, engine longevity and warranty questions are all irrelevant.

They are shooting for the stars.
I for one can’t wait to see how close they get.

[unsprung]

spend a moment with that head-on view, and there's so much going on in terms of air flow

this is no "elements of aero" added to some design

it's a veritable supercraft steeped in physics

[Digger]

Steve-n3asv said:

It looks like a malnourished Pagani Huayra.

Is that you Mr Christian Von K?

[Kawasicki]

I love it!

[RumbleOfThunder]

Yes bike dweebs, your 2002 Yamaha R1 engine is more advanced than that of a bleeding edge multimillion £ hypercar, because I guess they don't understand engines like the bike guys do.

Edited by RumbleOfThunder on Thursday 23 August 21:58

[boxerTen]

RumbleOfThunder said:

Yes bike dweebs, your 2002 Yamaha R1 engine is more advanced than that of a bleeding edge multimillion £ hypercar, because I guess they don't understand engines like the bike guys do.

Given Cosworth is involved we can safely expect a very good engine. When comparing it to a bike engine we need to keep in mind the different design compromises. Engine weight is a huge issue for a bike, far less for a car, even the Valkyrie.

For a given target power output, one needs a given bore area, long or short stroke doesn't matter much. Low engine weight requires using a short stroke resulting in an oversquare cylinder. The BMW S1000RR has a bore to stroke ratio of 1.6 for example. Engine weight being less of a concern in the Valkyrie, expect a less extreme ratio. If they do go with a 1.6 ratio then a whisker over 1000 bhp is expected.

[Mark-C]

The Dictator said:

Oldwolf said:

Nice to see the VW Beetle split-screen brought up to date :-)

That's the windscreen wiper.

Mr Parrot would like his whoosh back ....