RE: Time For Tea? McLaren P1 vid

[TomN94]

Streetrod said:

Is that the same Ferrari that no one has seen yet or heard yet, if so can I borrow your crystal ball?

And second if the MP4-12C was such a let down why is it currently beating its sales targets?

The very same Ferrari that has been seen and heard in several Youtube videos. http://www.youtube.com/watch?v=NR3lkxrYo9o

ETA: You can hear the engine even better in this one. http://www.youtube.com/watch?v=dBak90wljys

Edited by TomN94 on Saturday 26th January 13:46

[bertie]

Streetrod said:

Is that the same Ferrari that no one has seen yet or heard yet, if so can I borrow your crystal ball?

And second if the MP4-12C was such a let down why is it currently beating its sales targets?

What was the target and what were the actual sales?

[anonymous-user]

nickz32 said:

Something has been festering in my mind for a little while, which then isnt helped by vids like these.

My question is this, what causes these new generation Hyper Cars (Aventador and Mc P1 so far) to spew Blue flames from the exhaust under power, unlike normal exhaust flames on over run.

I would take a guess that they run really short and thin exhausts which in turn get very hot, but i would have thought the exhaust gasses would be moving too fast to be able to ignite in this fashion.... anyone got any insight into the hows and whys?

Have been wondering the same thing. I've never knowingly seen petrol burn with a blue flame anywhere but on pictures and videos like these.

[DonkeyApple]

sharm said:

nickz32 said:

Something has been festering in my mind for a little while, which then isnt helped by vids like these.

My question is this, what causes these new generation Hyper Cars (Aventador and Mc P1 so far) to spew Blue flames from the exhaust under power, unlike normal exhaust flames on over run.

I would take a guess that they run really short and thin exhausts which in turn get very hot, but i would have thought the exhaust gasses would be moving too fast to be able to ignite in this fashion.... anyone got any insight into the hows and whys?

Have been wondering the same thing. I've never knowingly seen petrol burn with a blue flame anywhere but on pictures and videos like these.

Good question. My immediate assumption was that it is the high temp of the pipes and less oxygen but in today's world it might well be a reactive coating?

[bertie]

DonkeyApple said:

Good question. My immediate assumption was that it is the high temp of the pipes and less oxygen but in today's world it might well be a reactive coating?

Thinking back to school physics and Bunsen burners, isn't it due to having a good oxygen supply, maybe due to engines not closing throttles so quickly to reduce unburnt fuel.

[RedSpike66]

Hammerheadcars said:

and why disguise it when it's already been unveiled?

Marketing

[Donkey62]

bertie said:

Thinking back to school physics and Bunsen burners, isn't it due to having a good oxygen supply, maybe due to engines not closing throttles so quickly to reduce unburnt fuel.

Temperatures blue is hotter than red

Mid mounted engines in racecars with short exhausts even with cats tend to spit out blue flames when really going for it. Blues are hard to see in daylight as the cooler reds take over.

I want that camo wrap!

[DonkeyApple]

bertie said:

DonkeyApple said:

Good question. My immediate assumption was that it is the high temp of the pipes and less oxygen but in today's world it might well be a reactive coating?

Thinking back to school physics and Bunsen burners, isn't it due to having a good oxygen supply, maybe due to engines not closing throttles so quickly to reduce unburnt fuel.

Correct. Dumbass me, especially as I seem to have the word 'Chemist' on my degree documentation.

[kayzee]

This could quite possibly be the best car ever made imo.

[wst]

DonkeyApple said:

Correct. Dumbass me, especially as I seem to have the word 'Chemist' on my degree documentation.

The problem is that you might be aware of the possibilities of reactive coatings while the rest of us are on the "more oxygen = loud blue bunsen flame" thing.

Could there be gas from the turbo wastegate being dumped into the exhaust instead of having a 'screamer' pipe, so when the car changes gear or the throttle is released, all the air bypasses the engine and ends up in the hot exhaust with hot fuel and... it's pretty warm from being compressed and suchlike... making fire? (In that case, why does older stuff do the big yellow flames?!)

[bertie]

wst said:

....... (In that case, why does older stuff do the big yellow flames?!)

Because in olden days, your throttle was connected by a cable to the butterfly so when you jump off the throttle, the butterfly snaps shut and stops air (oxygen) going in and the unburnt fuel burns with less oxygen (orange wavey flame)

In a modern drive car with drive by wire throttle, to avoud unburnt hydrocarbons, you jump off the throttle pedal but the ECU closes the butterly slowly of with a slight delay, to allow enough air through the engine to make sure any unburnt fuel is properly combusted (blue flame!)

Well that's my theory, which could be cobblers!!